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                    <text>C O L O R A D O

P A R K S

&amp;

W I L D L I F E

Big Game Hunting
Quick Guide

Planning Your License Purchase and Hunt
Start With Hunter Education
Hunter Education certification is required before
buying or applying for any hunting license if
you were born on or after 1/1/49. Plus, Hunter
Ed provides an excellent overview of Colorado
hunting. The course covers the basics of hunting safety, wildlife identification, outdoor skills,
regulations, and includes a live fire session.
Online classes, traditional classroom classes
and Bowhunter Ed (specialized archery classes)
are offered. Colorado also honors all other state
Hunter Ed certifications. The calendar of available classes is online.

Elk

Mule Deer

Choose Your Species
First, decide which of the nine big-game species
you’d like to hunt and the gender of the animal
you’ll pursue. The hunting regulations for each
big-game species are published in the regulation
brochures released each February:
• Big Game (elk, mule deer, white-tail deer,
pronghorn, moose and bear)
• Sheep and Goat: (Rocky Mountain and desert
bighorn sheep and mountain goat)

Pronghorn

Decide Where to Hunt
Colorado divides the state into distinct hunting
areas called Game Management Units or GMUs
(see map). To prevent over harvesting, a limited
number of licenses by species are assigned to
be sold in each GMU. The number of limited
licenses available in each GMU is called the

quota. The GMU map and unit descriptions are
published in the regulation brochure(s). Colorado boasts 23 million acres of public land with
easy hunting access. Private land only licenses are
also available.
Select Your Method
Colorado offers distinct seasons for archery,
muzzleloader and rifle hunting. Requirements for
the various methods and for transporting them
in the field are listed in the brochures.

Archery

Rifle

Muzzleloader

Pick Your Hunting Season
Archery season offers the earliest big-game
opportunities, starts in late August and lasts
almost a month. Muzzleloader season overlaps
the archery season and starts towards the middle
of September. Colorado offers four distinct
rifle seasons with the opportunity to hunt from
October until January. The second and third rifle
seasons are the longest and these seasons span
two weekends. (See the brochures for specifics
and hunt codes.)

Rocky Mountain
Bighorn Sheep

Desert Bighorn Sheep

Mountain Goat

COLORADO PARKS &amp; WILDLIFE • 6060 Broadway, Denver, CO 80216 • (303) 297-1192 • cpw.state.co.us

Photos © CPW, unless noted

Moose

© DonaldMJones.com

© Tyler Baskfield

Bear

© Ken Archer

White-Tail Deer

�When to Apply and/or Buy a License
APPLY for the DRAW
Early April—Limited Licenses
• Limited Licenses—(set numbers available by unit)
• Public &amp; Private Land Only (PLO) Licenses
• Ranching for Wildlife Licenses—CO residents only
Application Deadline—1st Tuesday in April each year
BUY
Early August—All licenses on sale
• Leftover Limited Licenses—no application needed to purchase any limited license remaining after the Draw
• Over-the-Counter (OTC) Licenses—(Unlimited availability or with a cap) Elk, pronghorn, bear and limited whitetail.
Where to Buy or Apply
• Online—cpw.state.co.us
• By Phone—800-244-5613
• In Person—License Agents &amp; CPW Offices
• By Mail*—Applications published in the brochures

*Note-Non-resident moose, sheep and goat applications must use paper applications to apply
and be postmarked by the deadline.

Hunt Preparation
Colorado big game hunting is a curiosity for many and venturing out into the field to pursue game for the first time requires
a little planning to be successful. Obtaining your big-game
license, building the skills to harvest an animal, making sure
you have the right gear, scouting for game and physically preparing for the hunt are all part of the preparation process.
Planning Resources
• Big Game Brochures: Online with helpful videos or print
• Colorado Hunting Atlas: Online virtual scouting
• Skills Building Classes and Seminars: Class calendar online
• Regional Hunt Guides: Unit detail by Region
• Enews: Reminders delivered straight to your inbox
• Elk Hunting University: Online articles and advice
• Colorado Outdoors magazine: Timely recreation articles
• Hunt Planner Webpage: Planning checklist and helpful links
• Shooting Ranges: Over 100 ranges for practice and sight-in
• Outfitter Directory: Outfitters offering guided hunts
Call (303) 297-1192 or (303) 291-PLAN (7526)

Hunt Elk Every Year—no application needed
Colorado offers an unlimited number of OTC Bull Elk Rifle tags during the second and third seasons. That OTC license allows you
to hunt in any of the units shaded in gold below during the season. Current OTC maps are available each February.

2014 OTC BULL ELK UNITS | 2nd &amp; 3rd RIFLE SEASONS
Please check the 2014 Colorado Big Game Hunting brochure for unit specific regulations | Colorado Parks and Wildlife | cpw.state.co.us | (303) 297-1192

COLORADO PARKS &amp; WILDLIFE • 6060 Broadway, Denver, CO 80216 • (303) 297-1192 • cpw.state.co.us
5/2014

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                    <text>Whitewater Park Projects
Guidance for Reviewing 404 Projects

�COLORADO PARKS AND WILDLIFE
Dan Prenzlow, Director
LEADERSHIP TEAM
Reid DeWalt, Assistant Director for Aquatics, Terrestrial and Natural Resources; Heather
Dugan, Assistant Director for Field Services; Justin Rutter, Assistant Director for Financial
Services; Lauren Truitt, Assistant Director for Information and Education; Jeff Ver Steeg,
Assistant Director for Research, Policy, and Planning; Brett Ackerman, Southeast Region
Manager; Cory Chick, Southwest Region Manager; Mark Leslie, Northeast Region
Manager; JT Romatzke, Northwest Region Manager
STUDY FUNDED BY
Colorado Parks and Wildlife
SUGGESTED CITATION
Kondratieff, M. C., K. R. Bakich, E. E. Richer, D. A. Kowalski, and B. F. Atkinson. 2020.
Whitewater Park Projects: Guidance for Reviewing 404 Projects. Colorado Parks and
Wildlife Aquatic Research Section, Fort Collins, CO. 26 pp.

�Introduction
Colorado Parks and Wildlife’s (CPW) statutory mission is to perpetuate the wildlife resources
of the State, to provide a quality State Parks system, and to provide enjoyable and
sustainable outdoor recreation opportunities that educate and inspire current and future
generations to serve as strategic stewards of Colorado’s natural resources (C.R.S. § 33-9-101
(12) (b)). As CPW is responsible for the management and conservation of aquatic resources
within the State, we are asked to review projects that may affect aquatic habitats or
populations. Specifically, CPW staff is often engaged by the Army Corps of Engineers (USACE)
to review permit applications related to the design, construction, and monitoring of
whitewater parks (WWPs) regulated under Section 404 of the Clean Water Act. WWP projects
typically fall under the following permits:



NWP 27 - Aquatic Habitat Restoration, Establishment, and Enhancement Activities
IP - An individual, or standard permit, is issued when projects have more than minimal
individual or cumulative impacts, are evaluated using additional environmental
criteria, and involve a more comprehensive public interest review.

Recreational in-channel WWPs (Figure 1) are gaining popularity throughout the United States
with Colorado being the epicenter for WWP development. Although WWPs provide economic
and recreational benefits for local communities (Hagenstad et al. 2000; Loomis and McTernan
2011), they can have unintended impacts on aquatic biota, habitat, and river functions. This
is especially true when the hydraulic conditions formed by the WWP differ substantially from
those naturally found in the surrounding river. Natural unmodified river channels are not good
candidates for locating WWPs (American Whitewater 2007). Rather, WWP projects should be
located in areas that have already been substantially modified by past human activities.

A

B

Figure 1. Two typical whitewater park structures include chute-type (A) and drop-type
structures (B)
CPW recommends that adequate environmental safeguards be included in the design and
construction of WWPs to assure that impacts to river functions (Harman et al. 2012),
fisheries, and recreational angling opportunities are minimized. The intent of this document
is to provide USACE with uniform guidance from CPW with regard to project review to assure
that the least environmentally damaging practicable alternative (LEDPA) is followed when
WWPs are proposed, designed, constructed, and maintained over time. CPW offers the
following guidelines to maximize the benefits of recreational WWP opportunities while
1

�minimizing adverse impacts to fisheries and river functions. These are general
recommendations and each project should be reviewed on a case-by-case basis prior to
issuing permits. Failure to demonstrate that the following guidelines were implemented with
due diligence will result in categorical opposition to the project from CPW.
General Recommendations
WWPs are constructed in a wide variety of stream locations utilizing a diverse array of design
elements that are unique to the particular design firm and project engineer, project goals
and expectations, and river conditions. General recommendations for all WWP projects should
include:
1) Early Consultation with CPW: Contact the local CPW Area Aquatic Biologist as early as
possible in the design process to obtain information regarding the species presence, fish
populations, and fisheries management objectives for a proposed project site. CPW
conducts hundreds of fish population surveys on streams and rivers throughout Colorado
annually and uses survey results to inform fisheries population management. Instructions
for submitting formal requests for CPW fisheries data are available at the CPW Aquatics
Data Management webpage. A map of CPW management areas with contact information
for Aquatic Biologists is included in Appendix A and available at the CPW Aquatic
Management webpage.
2) Monitoring and Adaptive Management: Monitoring efforts may focus on physical aspects of
habitat, biological aspects of fish populations, or a combination of both. Monitoring
efforts should be tailored specifically with the goal of detecting undesired or unintended
impacts to the aquatic environment or community. CPW recommends a minimum
monitoring period that includes two years of baseline and five years following project
construction. Data collection should focus on documenting baseline conditions, as-built
conditions, and project effectiveness with at least two monitoring events occurring during
the five year post-construction monitoring period. Adaptive Management provides a
framework that incorporates measurable, relevant monitoring criteria and predetermined
thresholds for acceptable change to assess and address undesired or unintended impacts
to the aquatic environment and communities (Bouwes et al. 2016). Every WWP design
package should include a detailed Adaptive Management Plan (AMP). An AMP should
identify quantifiable monitoring criteria and anticipated impacts to the aquatic
environment that incorporates review and input from CPW and other management
agencies to the USACE. A robust AMP will include a remediation strategy that identifies
stakeholders, resolution processes, and funding sources to engage if project objectives are
not met and thresholds are exceeded.
3) Thresholds for Mitigation Actions: As part of the permitting process prior to issuing permits
and project implementation, regulators should work with CPW to establish the level of
allowable impairment to the natural resource and develop objective thresholds to trigger
mitigation actions, such as requiring structural modifications or off-site mitigation.
Objective and measurable thresholds for changes to river condition and function will
provide enforceable triggers for mitigation or remediation actions.
4) Cumulative Impacts: The potential for cumulative impacts exist when a WWP has two or
more structures. Projects consisting of multiple structures should be reviewed as having
the potential for cumulative impacts. Cumulative impacts should be viewed as more
serious than impacts from a single structure. WWPs have the potential to cause
2

�cumulative impacts to fish passage, fish habitat or both within a single project location or
when a project is located in proximity to other existing manmade river structures (e.g.,
diversion structures, dams, etc.). Some examples of cumulative impacts from WWP
development include: degradation of State-identified high priority habitats and creation
of fish movement obstacles or barriers that limit access by fish to critical forage, refugia,
or reproductive habitats.

Popular whitewater park recreation activities on a Colorado stream.
A CPW fact sheet that provides an overview of WWP research, impacts on fisheries, and
design guidelines has been included as Appendix B.
Fish Passage
WWP structures have the potential to negatively affect fish by fragmenting populations,
reducing migratory ranges, and limiting access to habitat for spawning, feeding, and refuge
(Schlosser and Angermeir 1995). Aquatic habitat fragmentation is ubiquitous throughout
Colorado, contributing to the decline of native aquatic species diversity and abundance (CPW
2015). The elements that create and maintain a desirable play wave (hydraulic jump,
increased velocity, decreased depth, steep-sloping long chutes, abrupt vertical drops, and
grouted smooth stream channel) can create hydraulic conditions that can impede or prevent
upstream fish passage. Suppression of upstream fish movement has been documented at WWP
structures, but the degree of impact varies by fish species, fish size, depths, velocities,
characteristics of individual structures, and variability in flow conditions (Stephens et al.
2015; Fox et al. 2016; Richer et al. 2018). As trout are among the strongest swimming and
jumping species found in Colorado, small-bodied and weaker-swimming fish native to
Colorado streams are even more susceptible to suppression of upstream movement at WWP
structures. Migratory populations of native Colorado suckers, minnows, and trout are also
adversely affected by habitat fragmentation, with some individuals moving long distances (25
or more miles) during upstream migrations to access spawning habitat (Kondratieff et al.
3

�2017; Thompson et al. 2019). To minimize loss of fish passage functions, CPW recommends
the following guidelines be incorporated into the design of WWP projects:
1) Target Species and Life Stages: Design WWP structures to allow upstream fish passage for
all species present at the project site, unless there are specific management objectives
that warrant exclusion of particular fish species. Fish passage elements are expected to
pass juvenile and adult life stages (Forty et al. 2016).
2) Design Flows: Fish passage design elements of WWP structures should be designed to
provide passage across a range of typical flows, including flows corresponding with the
timing of critical life history movement events such as spawning migrations or access to
refugia. The average daily discharge that is exceeded 95% and 5% of the time should be
selected for the low and high fishway design flows, respectively (NMFS 2008).
3) Fishway Invert Elevations: Fishways are engineered pathways specifically designed to
accommodate fish movement around or through WWP structures. Fishways should provide
passable conditions over a range of flow conditions. Fish passage design elements should
be constructed so that the upstream invert of the fishway exit is located at a lower
elevation than the upstream invert of the WWP recreation structure crest to ensure that
the fishway functions during extreme drought or low flow conditions.
4) Instream Flows: Fishways should have sufficient capacity for carrying either: 1) the
decreed instream flow (if a Colorado Water Conservation Board (CWCB) instream flow
water right exists for the stream or river in question), or 2) where no decreed instream
flow exists, a minimum flow volume that is reasonably necessary for maintaining fish
passage in the stream or river in question.
5) Attraction Flows: Sufficient attraction flows at the downstream fishway entrance is a
critical factor that will affect efficiency of the fish passage structure. The hydraulic
conditions (i.e., velocity, depth, and turbulence), quantity, and location of attraction
flows are all important design considerations. In general, increasing the amount of
attraction flow relative to the total river flow will increase the effectiveness of the
fishway for providing upstream passage. The minimum attraction flow necessary to
provide adequate attraction conditions for fish is 5-10% of the total river flow (NMFS
2008).
6) Passage Criteria: WWP designs should provide comparisons of hydraulic conditions within
the fishway to species-specific design criteria for identifying limiting swimming speeds,
water depths, and vertical drops that ultimately provide evidence for the effectiveness of
fish passage conditions. Hydraulic modeling results should include depths, velocities, and
locations of hydraulic jumps for existing and proposed conditions so that fish passage
hydraulic conditions can be evaluated before the project is implemented. Fish passage
criteria including the swimming speeds and jumping heights for Colorado fishes are
included in a CPW fact sheet on Fish Passage at River Structures (Appendix C).
7) Incorporation of Natural Channel Forms and Processes: Fish passage design elements
should function to enhance, maintain or mimic the pre-existing natural stream conditions
(gradient, depth, velocity, and channel roughness) found at the proposed site of each
recreational drop structure. This is especially important when there is a lack of speciesspecific swim passage criteria.
8) Monitoring Fish Passage: Various methods have been used to evaluate fish passage at
instream obstacles or barriers. Fish passage efficiency through WWPs has been monitored
4

�using hydraulic modeling by 3-dimensional hydraulic models (Stephens et al. 2016), 2dimensional hydraulic modeling (Hardee 2017), and a least-cost path approach combining
known swim speeds and 2-dimensional hydraulic modeling (Brubaker et al. 2018). Fishway
evaluations can also be conducted by marking individual fish and monitoring their
movements over time (i.e., PIT tag or Mark-Recapture studies; Fox et al. 2016). A
combination of hydraulic modeling and validation studies using marked fish provide the
strongest support for monitoring fishways by utilizing multiple lines of evidence. Ideally
fish passage evaluations collect fish passage data from a) the pre- project reach, b) a
nearby control site (up or downstream of the project reach) that is representative of a
natural condition, c) the post-project reach, or d) a combination of some (Before/After or
Control/Impact) or all sites (i.e., a full BACI study design). Project objectives should be
measureable and monitoring of pre- and post-project conditions should be used to
evaluate project effectiveness and inform adaptive management. CPW recommends a
minimum monitoring period of one year of baseline and three years following WWP
project construction, with an emphasis on documenting baseline conditions, as-built
conditions, and project effectiveness with at least two monitoring events during the postconstruction three-year period.
9) Adaptive Management: AMPs should evaluate proposed and post-project changes to
hydraulics and topographic conditions including water depth, velocities, hydraulic jumps,
and bed drops at each constructed WWP feature over the range of design flows. These
criteria should be used to evaluate project objectives and thresholds for requiring
mitigation actions. AMPs should be included as part of the design package for each WWP
project.

Whitewater park structure with engineered fish bypass
Fish Habitat
WWP structures and their placement within a stream channel have the potential to degrade
aquatic habitat quality. Many factors influence aquatic habitat quality and should be
5

�incorporated into WWP designs. The placement of WWPs in channels should follow published
geomorphic criteria for physical relationships related to channel width, pool spacing, and
riffle lengths to minimize the potential for channel instability and habitat impairment
(Leopold et al. 1964, Dunne and Leopold 1978). The valley type, process domain, stream
gradient, stream hydrology, and substrate characteristics should be used to inform WWP
designs and the placement of structures within the proposed reach. Fish behavioral traits, life
history characteristics, physiological tolerances, and swimming and jumping capabilities are
directly related to the physical habitat characteristics found in the natural channels which
they occupy. Low gradient stream channels in unconfined valleys or plains are typically
occupied by fish species that are incapable of jumping over vertical obstacles and have
resident fish with weaker swimming capabilities. High gradient mountain streams are typically
occupied by fish species that are capable of jumping and have swimming capabilities that
enable them to burst through high velocities and turbulence. Some weaker swimming, smallbodied fishes have behavioral traits that cause them to avoid swimming over deep pools
where they are vulnerable to predation. Instead, they utilize the lateral edges of stream
channels (Swarr 2018). Research has shown that impacts of WWPs on rivers and fisheries is
very specific and will depend on the specific conditions at a river site as well as the fish
populations present (Kowalski 2019). Ultimately, design and construction of WWP structures
should provide for fish and aquatic invertebrate habitat; such structures must take account of
the preservation of functional riverine and aquatic processes and maintain the natural
aesthetic qualities of the river to the greatest extent possible. CPW recommends the
following guidelines be incorporated into the design of WWP projects:
1) Minimize Extreme Hydraulic Conditions in WWP Pools: Natural pools located in unconfined
valleys with low channel bed slopes are characterized by predictable and relatively stable
hydraulic conditions that provide a balance between feeding and resting for fish. Fish feed
on aquatic prey drifting into pools from upstream riffles and find low velocity resting
areas close to the bed within pools that minimize energetic demands for fish swimming
and maintaining equilibrium. Although WWPs create deep pools, observed fish densities
and biomass were higher in natural pools than in WWP pools for trout and native fish
(Kolden et al. 2015). A combination of hydraulic modeling and direct field measurement
of hydraulic conditions present in WWP pools found higher turbulence (6×), vorticity (2×),
velocity (3×), surging (40×), and depth (2×) were observed in WWP pools as compared to
natural pools. Habitat suitability scores incorporating depths and velocities for Rainbow
Trout (Oncorhynchus mykiss) and Brown Trout (Salmo trutta) were higher for pools
located in WWP reaches than natural pools. However, fish abundance estimates (biomass
and densities) for WWPs were lower, providing evidence that the use of habitat suitability
scoring to quantify habitat conditions for pools located in WWPs may be inappropriate.
Direct measurements of fish abundance (biomass and densities) are preferred over habitat
suitability modeling for evaluating WWP pool quality until more research can be done to
incorporate additional information to improve model performance. Lower fish abundance
may be explained by conversion of food producing riffles to impervious grouted drops over
WWP structures, increased hydraulic variability (turbulence, vorticity, velocity, and
surging) characteristic of WWP pools, or a combination of these factors. Based on results
from Kolden et al. (2015), habitat suitability scoring through use of hydraulic models for
pools may not be as reliable an indicator of overall habitat quality as direct estimation of
fish abundance. Additional studies in Colorado have indicated that impacts to fish
populations are site-specific and can be subtle (Kowalski 2019). If structures are designed
and spaced properly, impacts to fish populations can be reduced. In some rivers, WWP
structures have been shown to increase habitat suitability and density of non-native and
6

�non-game fish species like White Sucker (Catostomus commersonii) and Longnose Sucker
(Catostomus catostomus) while large scale impacts to trout populations can be minimized.
2) Design Pool-to-Pool Spacing to Match Expected Ranges from Geomorphic Relations: Pool to
pool spacing within WWPs are often outside the range of natural variability found in
natural channels of the same valley and stream type (Leopold et al. 1964, Dunne and
Leopold 1978). Most often, pools in WWPs are more closely spaced than what would be
found in natural stream reaches of the same geomorphic context. This can result in
increased channel instability from accelerated erosion or deposition with pools filling with
sediment and the need for frequent maintenance and removal of sediments from WWP
pools. Pool spacing also can have an impact on aquatic invertebrate populations.
Improperly designed and spaced WWP structures can remove natural riffles from river
reaches and reduce the diversity of aquatic invertebrates (Kowalski 2019). Designing river
channel features that are in balance with the stream flow and sediment supply of each
specific site is important in preserving natural hydraulic and biological functions of riffles.
3) Preservation of Riffle Habitats: WWP structures are commonly constructed using concrete
grout, pre-cast concrete blocks, and large boulders used to direct flow and manipulate
hydraulics. The materials used for WWP structures either fill-in or replace interstitial
spaces normally found in coarse riffle habitat where macroinvertebrates reside, juvenile
trout find refuge, and native fish such as Mottled Sculpin (Cottus bairdii), dace, and
suckers live out most of their life cycles. Large, grouted WWP structures have been shown
to support less diverse aquatic invertebrate communities then natural riffles (Kowalski
2019). WWP designs should preserve some riffles within the project reach instead of
converting all riffles to WWP drops. Individual WWP structures require a drop in elevation
to function optimally and thus WWP drop structures often replace natural riffle features.
As a consequence, WWP reaches typically have proportionally less riffle habitat as
compared to adjacent natural stream reaches within the same valley and stream type. A
reduction in overall riffle habitat (area) could result in less macroinvertebrate habitat and
consequently less food for fishes residing in WWP reaches. Research has shown that in
some rivers in Colorado, improperly spaced structures degrade riffle habitat and reduce
the diversity of aquatic invertebrates while properly designed structures that include
riffle habitat can be as diverse and productive as natural riffles (Kowalski 2019). Riffle
habitat converted to impervious, grouted structures may result in a loss of interstitial
habitat critical for providing habitat for macroinvertebrates, native benthic fishes like
sculpin and dace, and juvenile rearing habitat for trout.
4) Monitoring Fish Habitat: A variety of methods have been used to evaluate fish habitat at
WWPs including 2-dimensional and 3-dimensional hydraulic modeling of the natural
(control) and project reach incorporating habitat suitability criteria (Kolden et al. 2015).
Fish habitat conditions can also be evaluated by directly surveying fish populations (fish
density and biomass) before and after project construction and/or within and outside of
the constructed WWP reach. Ideally fish habitat evaluations collect data from a) the preproject reach, b) a nearby control site (up or downstream of the project reach) that is
representative of a natural condition, c) the post-project reach, or d) a combination of
some (Before/After or Control/Impact) or all sites (i.e., a full BACI study design). Project
objectives should be measureable and monitoring of pre- and post-project conditions
should be used to evaluate project effectiveness and inform adaptive management. CPW
recommends a minimum monitoring period of two years for baseline and five years
following construction, with an emphasis on documenting baseline conditions, as-built
7

�conditions, and project effectiveness with at least two monitoring events during the postconstruction five-year period.
5) Adaptive Management: AMPs should evaluate proposed and post-project changes to the
river environment including pool-to-pool spacing, hydraulic variability (turbulence,
vorticity, velocity, and surging), changes to the proportion of riffle habitat, changes in
fish population or habitat suitability, and riparian area. These criteria can be used to
inform and develop project objectives and thresholds.
Sediment Deposition
The placement of WWPs in river channels should follow established geomorphic criteria
(Leopold et al. 1964; Dunne and Leopold 1978) for physical relationships of channel width,
pool spacing, and riffle lengths to minimize the potential for channel instability, habitat
impairment, as well as decrease the frequency of structure maintenance and in-channel
disturbance. Sediment characteristics and related processes will vary by valley type, process
domain, stream gradient, and stream hydrology. These factors should be incorporated WWP
designs and inform the placement of structures within the proposed reach.
1) Minimize Sediment Deposition: WWP structures should not disrupt or curtail sediment
transport by inducing sediment deposition upstream or downstream of the structure.
Sediment deposition can eliminate preferred fish and benthic macroinvertebrate habitats,
as well as create favorable conditions (finer substrate) for the spread of whirling disease
in trout. Sediment deposition could also result in reduced channel capacity which could
increase flooding risk to surrounding areas. Sediment deposition will likely be inevitable at
WWP due to the loss of energy over the structure, so maintenance plans to periodically
remove excess sediment are needed.
2) Avoid Rapid Contraction and Expansion in WWP designs: WWPs can create a sequence of
rapidly contracting and expanding riverbank conditions that lead to problems of
sedimentation in pools and a need for more frequent maintenance to remove the excess
sediment. WWP designs should incorporate knowledge of channel maintenance flows
(bankfull conditions) and the potential for contraction/expansion to induce sediment
deposition within WWP reaches.
3) Adaptive Management: AMPs should evaluate proposed, pre-, and post-project changes to
the river environment in the longitudinal profile and representative cross sections
including changes to streambed substrate characteristics. Monitoring should document
areas of sediment deposition, fine sediment deposition areas, and bank erosion. Projects
should consider seeking Colorado 401 Water Quality Certification from the Colorado Water
Quality Control Division and conduct pebble counts at critical cross sections before and
during the post-project monitoring period. Pre-project monitoring data should be used to
inform project objectives and establish thresholds.

8

�Sediment deposition in whitewater park pools
Site Selection
Properly locating WWPs within river systems is one of the best ways of minimizing physical,
ecological, and social impacts to rivers and streams including channel stability, sediment
deposition, fish passage, fish habitat, and recreational angling. Site locations that have been
identified as existing barriers to fish movement (e.g. diversion structures or dams) and that
been heavily modified by past human activities are preferred locations for WWPs.
1) Step-Wise Hierarchical Decision Making Framework for Site Selection: CPW proposes the
following steps be carried out in a step-wise fashion according to the following
hierarchical framework to ensure that the LEDPA is selected during the site selection and
design process. The level of risk with respect to impairment of fish passage and habitat
increases with each successive step. Therefore, more intensive monitoring evaluations
should be commensurate with increasing levels of risk. WWP designs must provide
justification for the following:
a. High Priority Habitat and Special Management Reaches: WWP projects proposed in the
following designated river reaches will result in categorical opposition from CPW
including the following: 1) Designated Cutthroat Trout Waters, 2) Critical Habitat for
Threatened and Endangered Species as well as reaches identified as sensitive habitat
for State Species of Concern, and 3) Gold Medal Waters.
b. Geomorphic Setting: Provide justification for a WWP design alternative that is located
in an unconfined valley setting (unconfined valleys have an Entrenchment Ratio (ER)
&gt;2.2) and stream channel slopes that are 2 % or less. Geomorphic settings consisting of
artificially or naturally confined valleys and Rosgen A, B (step-pool), F, and G stream
types have hydraulic characteristics more similar to those produced by WWP structures
and therefore contain fish species and assemblages that are adapted to living in similar
hydraulic conditions as those commonly associated with WWPs.
c. Partially Channel-Spanning Structure: If a site location cannot be identified within the
appropriate geomorphic setting, provide justification for a WWP design alternative
9

�that requires full channel-spanning structures. Partially channel-spanning structure
designs should be used unless project goals or site constraints dictate that a fully
channel-spanning structure is required.
d. Natural Channel Split: If a partial channel-spanning structure is not possible, provide
justification for a WWP site location on a single-thread channel site. Channel splits can
serve dual functions with one split providing WWP recreation while the other channel
split is left as natural and unmodified. A split branch of an existing channel (side
channel or one side of an existing island) should be used unless project goals or site
constraints dictate that a single-thread channel site is required.
e. Artificial Channel Split: If a suitable site location cannot be found on a natural split
branch of an existing channel, provide justification for a WWP site location on an
artificially-constructed split branch channel (constructed side channel or one side of
an artificially-constructed island). Artificial channel splits can serve dual functions
with one split providing WWP recreation while the other channel split is designed to
mimic natural, reference-like conditions. An artificially-constructed split flow channel
(constructed side channel or one side of an artificially-constructed island) should be
used unless project goals or site constraints dictate that a single-thread channel site is
required.
f. Technical Fishway: If the site location is constrained such that an artificiallyconstructed split flow channel is not possible, technical fishway concepts (such as a
constructed bypass channels or riffles, rock ramps, or vertical slots) must be
incorporated into WWP structure designs.
g. No Fish Passage Elements: WWP designs that do not incorporate fish passage elements
into structures are not acceptable and will result in categorical opposition from CPW.
2) Minimize WWP Recreation Conflicts with Anglers and Non-Whitewater Recreation Boaters:
WWP sites should be located to avoid recreational conflicts with anglers and nonwhitewater recreational boaters (i.e., drift boats and canoes). Hydraulic conditions
formed by WWP structures can impede safe boat travel for non-whitewater recreational
boaters. Within WWPs there is an increased potential for whitewater recreational boaters
to displace stream anglers, especially during the summer months. Incompatibilities
between stream anglers and recreational boaters exist. Creel survey data from Colorado
and Wyoming suggest that stream anglers prefer to fish in locations that are uncrowded,
provide pleasant conditions close to nature, and are relaxing. The conditions commonly
encountered at and in the vicinity of WWPs include artificially armored and terraced
banks with minimal vegetation and encourage spectating crowds.
3) Mitigation for Lost Angler Opportunity and Access: Mitigation should be considered to
replace lost angler access, infrastructure, and fishing opportunity. There is a history of
new WWP construction within or replacing existing Fishing Is Fun (FIF) habitat projects
funded through Federal sportfish dollars at sites in Colorado including Pagosa Springs,
Basalt, Ridgway, and Montrose. When new WWPs are proposed within heavily used urban
fishing areas, intensively managed fisheries (those with special harvest restriction
regulations), Gold Medal designated fisheries, FIF-funded habitat projects, or locations
with existing amenities (such as parking access, trails, boat launches, picnic areas, etc...)
funded by Federal sportfish dollars or other fishing interest groups (i.e., Trout Unlimited),
10

�reasonable mitigation is necessary. Mitigation may consist of replacing lost or degraded
infrastructure and amenities, increasing infrastructure to accommodate the new users,
and providing reasonable additional access points or developing alternative locations for
anglers nearby.
4) Off-Site Mitigation: Mitigation locations for offsetting loss of fish habitat from WWP
development should not occur within WWP project reaches, but should occur in separate
locations up- or downstream within the same river watershed if possible. Mitigation
possibilities include developing new areas open to fishing access or enhancing fish habitat
in an area that is not heavily impacted by recreational boating. Fish passage cannot be
mitigated off-site and must be accommodated through a WWP project.
Whitewater Park Project Applications
CPW will only provide technical design review for projects that submit complete applications.
Requests for design reviews must include complete permit applications with all pertinent
information, including project goals and objectives, a design report and plan set, assessment
of existing conditions, list of river stakeholders, revegetation plan, monitoring plans, and a
description of how the project will be maintained over time.
1) Early Consultation with CPW: Contact the local CPW Area Aquatic Biologist as early as
possible in the design process to obtain information regarding the species presence, fish
populations and fisheries management objectives for a proposed project site. CPW
conducts hundreds of fish population surveys on streams and rivers throughout Colorado
annually and uses survey results to inform fisheries population management. Instructions
for submitting formal data requests are available at the CPW Aquatics Data Management
webpage and contact information for CPW Aquatic Biologists is included in Appendix A.
2) Project Goals and Objectives: Applications must clearly identify project goals and
objectives, and describe the context and analysis leading up to the established LEDPA (if
already developed). The applicant should address the potential for fishery and ecological
impacts from the project and how they relate to the project goals and objectives.
3) Design Report and Plan Set: The design report should include a comparison of WWP project
alternatives that were used to inform the selection of the proposed WWP design. The
design report and plan set should clearly detail existing conditions of the proposed WWP
reach, description and layout of the proposed WWP reach, detailed description of fish
passage design elements proposed for each structure, description of existing hydrology and
design flows as they relate to fish passage design elements, and modeled hydraulic
conditions through each WWP structure and fish passage design elements.
4) Assessment of Existing Conditions: An assessment of existing conditions within the
proposed project reach should be conducted in order to determine the level of
anthropogenic impacts at the proposed site. What is the level of departure from a
reference or historic condition with respect to existing hydrology, hydraulics (floodplain
connectivity), geomorphology (sediment supply), physicochemical, and biological
condition? Consider application of the Colorado Stream Quantification Tool (SQT) (CSQT SC
2019) as a means to assign proposed project reach as Functioning, Not Functioning, or
Functioning at Risk. CPW advocates installation of WWPs in reaches that rate as Not
Functioning or Functioning at Risk to minimize impacts to “natural, unmodified” river
11

�channels. Ultimately, is the proposed site located in a natural or already significantly
modified site?
5) Other River Users and Stakeholders: A complete list of river user groups (stakeholders)
should be provided with the project application materials, or at least made aware of the
proposed WWP project.
6) CPW Consultation and Supervision: Early consultation with CPW area staff including a
description of the longitudinal extent of the project, whether or not water rights are a
part of the project (i.e., RCID), and a complete list of project goals. WWPs almost always
involve significant instream structures; both CPW and the CWCB believe that these
structures should be designed and their construction supervised by a Colorado registered
professional engineer and/or a professional hydrologist in consultation with both agencies.
7) Grout: Minimize the use of grout for construction of WWP structures except as needed to
maintain recreation function, human safety, and fish passage elements associated with
the WWP and as part of the criteria for selecting the LEDPA. If grout is used, recess the
grout elevation so it is not flush with the top of the structure elements, leaving spaces
between boulders or blocks for increased roughness and cover for small aquatic organisms.
Recessing grout and spacing boulders to create continuous pathways in the wing walls may
improve conditions for upstream fish passage at WWP structures.
8) Revegetation Plans: Riparian vegetation composed of native species is the primary control
for bank stability in many stream types and should be used to improve long-term stability
of the project. Revegetation plans should be included with the plan set for the project,
including success criteria, planting protocols, irrigation needs, weed control, and postconstruction stewardship. Designs should utilize biostabilization techniques to stabilize
disturbed streambanks as outlined in Living Streambanks: a Manual for Bioengineering
Treatments for Colorado Streams (Giordanengo et al. 2016).
9) Grade Control other than WWP Structures: If grade control is needed for proper function
of the WWP structure, hardened riffles comprised of boulder sills buried in native
substrate is suggested as an alternative to in-channel grout. Hardened riffles can also be
used to protect downstream riffle heads. All proposed structures (recreational or
otherwise) within a project that are necessary to the successful function of the proposed
WWP project are expected to meet LEDPA criteria in the project reach. We expect USACE
to consider all structures associated with a WWP project to be regulated as part of the
project and not subject to exemption.
10) RICDs: Recreational In-channel Diversion (RICD) water rights can be acquired for WWPs in
Colorado to provide recreational experiences in and on the water. RICDs should be
designed, constructed, and managed to minimize or avoid impacts to native and sport
fish. Flows deviating from the natural flow regime, such as water calls during spawning
periods or when young-of-the-year fish are emerging from spawning gravels, could have
adverse impacts on stream ecology (Poff et al. 1997). Meeting with CPW should be
conducted prior to applying for a water right tied to a specified location in the river
system (i.e., RICD). RICD proponents are strongly encouraged to contact USACE to
conducting a feasibility assessment for WWP development at a specific site location prior
to pursuing a water right. Federal regulations do not account for or prioritize permitting
of RICD water rights. This will improve efficiency of State resources and time for a project
12

�that is not federally permittable due to either location or design that does not meet
LEDPA criteria.
11) Post-Construction Site Visit: Require a post-construction site visit prior to rewatering of
structures when possible to verify as-built design and include CPW to identify any aquatic
resource concerns prior to rewatering.
12) Monitoring and Evaluation: Develop monitoring objectives that are measureable and use
objective monitoring criteria for pre- and post-project conditions to evaluate project
effectiveness and inform adaptive management. Comparisons between the proposed and
as-built conditions should be made to define allowable impacts and without exceeding
thresholds for requiring mitigation action.
13) Maintenance and Stewardship: WWP design plans should address structure maintenance,
sedimentation, and debris removal as part of stewardship considerations for at least five
years following project completion.

Whitewater park kayakers on a popular Colorado mountain river
Best Management Practices
1) Spawning Periods: Construction activities that cause streambed disturbance should not be
scheduled during periods when adult spawning migrations, egg incubation, or fry swim-up
are occurring. Fish eggs and fry may die if construction activities mobilize fine sediment
that smothers the streambed in which they reside. Repetitive and cumulative streambed
disturbances during critical reproductive periods can significantly affect population
dynamics and resiliency of local fisheries. In general, instream construction should be
13

�targeted for the months of August and September when flows are lower and impacts to
spawning fish and incubating eggs are less likely. Early communication with CPW is
encouraged as this suggested window could vary based on local considerations such as
elevation, environmental variability, and fish species present.
2) Invasive and Nuisance Species: To prevent the spread of invasive and/or nuisance species
(e.g., Asian Clam, Green River Mud Snail, New Zealand Mud Snail), we strongly encourage
that heavy equipment be cleaned prior to and after construction if the equipment was
previously used in another stream, river, lake, pond, or wetland within ten days of
initiating work. The following methods are recommended for preventing the spread of
invasive aquatic organisms:
a. Disinfection with QAC: Remove all mud and debris from equipment (tracks, turrets,
buckets, drags, teeth, etc…) and spray/soak equipment with a disinfection solution
containing quaternary ammonia compound (QAC). Treated equipment must be kept
moist for at least 10 minutes. The recommended concentration for any commercially
available QAC product used to disinfect equipment is 6 ounces of QAC solution per
gallon of clean water. The following QAC products have been tested by CPW and are
listed in order from highest to lowest concentration of active QAC: Green Solutions
High Dilution Disinfectant 256, Super HDQ Neutral, Quat 4, Vedco 128, and Quat 128.
b. Disposal of QAC: Wastewater treatment plants are capable of processing water
containing small amounts of QAC. Therefore, rinsing used QAC solutions down a
sanitary sewer is a safe method of disposal. However, QACs should be kept out of
storm sewers and other waterways. Always dilute old product before rinsing down
sanitary sewers directly from the container, and follow MSDS and label
recommendations regarding rinsing and disposal of empty containers. Small amounts of
QAC from spray disinfection may come in contact with the environment with few
negative effects. However, it is not recommended to dump large amounts of QAC
solutions directly on the ground. More detailed instructions for disinfection with QAC
products can be provided upon request.
c. Disinfection with Hot Water: Spray/soak equipment with water heated to a
temperature greater than 140 degrees Fahrenheit for at least 10 minutes.
3) Turbidity: Instream construction should be conducted in a manner that will minimize
turbidity of the water in the work area.
4) Petroleum Products and Chemicals: No petroleum products, chemicals, or other
deleterious materials should be allowed to enter or be disposed of in such a manner in
which they could enter the waterway or adjacent wetlands. Accordingly, we recommend
that oil absorbent “booms” be installed downstream of the project site during
construction activities.
References
American Whitewater, 2007. Whitewater parks-considerations and case studies.
https://www.americanwhitewater.org/content/Wiki/stewardship:whitewater_parks
Bouwes, N., S. Bennett, and Joe Wheaton. 2016. Adapting adaptive management for testing
the effectiveness of stream restoration: An intensively monitored watershed example.
Fisheries, 41:2, 84-91, DOI: 10.1080/03632415.2015.1127806.
14

�Brubaker, A., E. E. Richer, D.A. Kowalski, and M.C. Kondratieff. 2018. Making waves: The
effects of whitewater parks on fish passage. 43rd Annual Meeting of the Western Division
of the American Fisheries Society. Anchorage, Alaska. May 22, 2018.
Colorado Stream Quantification Tool Steering Committee (CSQT SC). 2019. Colorado Stream
Quantification Tool and Debit Calculator (CSQT) User Manual, Beta Version. U.S.
Environmental Protection Agency, Office of Wetlands, Oceans and Watersheds (Contract #
EPC-17-001), Washington, D.C.
CPW (Colorado Parks and Wildlife). 2015. State Wildlife Action Plan. Denver, Colorado.
Dunne, T., &amp; Leopold, L. (1978). Water in environmental planning. San Francisco, California:
W.H. Freeman and Company. 818 pp.
Forty, M., J. Spees, and M. C. Lucas. 2016. Not just for adults! Evaluating the performance of
multiple fish passage designs at low-head barriers for the upstream movement of juvenile
and adult trout Salmo trutta. Ecological Engineering 94:214-224.
Fox, B.D., B.P. Bledsoe, E. Kolden, M.C. Kondratieff and C.A. Myrick. 2016. Ecohydraulic
evaluation of whitewater parks as a fish passage barrier. Journal of the American Water
Resources Association. DOI: 10.1111/1752-1688.12397.
Giordanengo, J. H., R. H. Mandel, W. J. Spitz, M. C. Bossler, M. J. Blazewicz, S. E. Yochum,
K. R. Jagt, W. J. LaBarre, G. E. Gurnee, R. Humphries, and K. T. Uhing. 2016. Living
streambanks: A manual of bioengineering treatments for Colorado streams. Colorado
Water Conservation Board, Denver.
Hagenstad, M., J. Henderson. R. S. Rauncher, J. Whitcomb. 2000. Preliminary evaluation of
the beneficial value of waters diverted in the Clear Creek whitewater park in the city of
Golden, Stratus Consulting.
Hardee, T.L. 2017. Evaluating fish passage at whitewater parks using a spatially explicit 2D
hydraulic modeling approach. M.S. Thesis, Department of Civil and Environmental
Engineering, Colorado State University. 107 pp.
Harman, W., R. Starr, M. Carter, K. Tweedy, M. Clemmons, K. Suggs, C. Miller. 2012. A
function-based framework for stream assessment and restoration projects. US
Environmental Protection Agency, Office of Wetlands, Oceans, and Watersheds,
Washington, DC EPA 843-K-12-006.
Kolden, E., B.D. Fox, B.P. Bledsoe, and M.C. Kondratieff. 2015. Modelling whitewater park
hydraulics and fish habitat in Colorado. River Research and Applications. DOI:
10.1002/rra.2931.
Kondratieff, M. C. and E. E. Richer. 2017. Stream Habitat Investigations and Assistance.
Federal Aid Project F-161-R23. Colorado Parks and Wildlife, Aquatic Research Section.
Fort Collins, Colorado.

15

�Kowalski, D.A. 2019. Colorado River aquatic resource investigations. Federal Aid Project F237-R26. Colorado Parks and Wildlife, Aquatic Wildlife Research Section. Fort Collins,
Colorado.
Leopold, L., Wolman, G., &amp; Miller, J. (1964). Fluvial processes in geomorphology. San
Francisco, California: W.H. Freeman and Company. 544 pp.
Loomis, J., and J. McTernan. 2011. Fort Collins whitewater park economic assessment.
Department of Agricultural and Resource Economics, Colorado State University.
NMFS (National Marine Fisheries Service). 2008. Anadromous salmonid passage facility design.
NMFS, Northwest Region, Portland, Oregon.
Poff, N. L., J. D. Allan, M. B. Bain, J. R. Karr, K. L. Prestegaard, B. D. Richter, R. E. Sparks,
and J. C. Stromberg. 1997. The natural flow regime: a paradigm for river conservation and
restoration. BioScience 47(11): 769-784.
Richer, E.E., E.R. Fetherman, M.C. Kondratieff and T.A. Barnes. 2017. Incorporating GPS and
Mobile Radio Frequency Identification to Detect PIT-Tagged Fish and Evaluate Habitat
Utilization in Streams. North American Journal of Fisheries Management. DOI:
10.1080/02755947.2017.1374312.
Richer, E. E., A. B. Brubaker, D. A. Kowalski, and M.C Kondratieff. 2018. Making waves: the
effects of whitewater parks on fisheries. Sustaining Colorado Watersheds Conference,
Avon, Colorado. October 10, 2018.
Schlosser, I. J., and P. L. Angermeier. 1995. Spatial variation in demographic processes for
lotic fishes: conceptual models, empirical evidence, and implications for conservation.
American Fisheries Society Symposium 17:392-401.
Stephens, T. A., B. P. Bledsoe, B. D. Fox, E. Kolden, and M. C. Kondratieff. 2015. Effects of
whitewater parks on fish passage: a spatially explicit hydraulic analysis. Ecological
Engineering 83: 305–318.
Swarr, T.R. 2018. Improving rock ramp fishways for small-bodied Great Plains fishes. M.S.
Thesis, Department of Fish, Wildlife, and Conservation Biology, Colorado State University.
89 pp.
Thompson, K.G., and Z.E. Hooley-Underwood. 2019. Present distribution of three Colorado
River Basin native non-game fishes, and their use of tributary streams. Colorado Parks and
Wildlife Technical Publication 52.

16

�Appendix A
CPW Aquatic Biologist Contact Information

�MOFFAT
a
Ya mp

River

Tory Eyre
Meeker
(970)878-6074

JACKSON

LARIMER

Steamboat
Springs Office

ROUTT

Meeker
Office

GRAND

70

EAGLE

mp
Unco
e River
a hgr

n

el
gu
Mi

Ri
ve

SAN MIGUEL

r

OURAY

TELLER

SW

Jim White
Durango
(970)375-6712

Ri o Grande Ri v

CUSTER

er

RIO Monte
GRANDE Vista

i ve
Conejos R

OTERO

HUERFANO

COSTILLA
i
Purgatoire R

Miles
25

50

LAS ANIMAS

25

AQUATIC BIOLOGISTS
COLORADO PARKS AND WILDLIFE
0

KIT
CARSON

Smoky H
il

CHEYENNE

l River

75

100

NATIVE AQUATIC SPECIES
BIOLOGISTS
NORTHEAST REGION
Boyd Wright
(970)472-4366

BENT

PUEBLO

o
rf an
Hue

r

NORTHWEST REGION
Lori Martin
(970)255-6186

SOUTHEAST REGION
Josh Nehring
(719)227-5224

r
i ve

Lamar Office

PROWERS

Jim Ramsay
Lamar
(719)336-6607

SE

mo s
aR
i ve
r

NORTHEAST REGION
Jeff Spohn
(303)981-3634

KIOWA

Carrie Tucker
Pueblo
(719)561-5312

ALAMOSA

CONEJOS

ARCHULETA

nR

LINCOLN

Office
Ala

Durango
Office
Durango Regional LA PLATA
Administrative Office

Cory Noble
Colorado Springs
(719)227-5222

ub

a
lic

CROWLEY

Estevan Vigil
Monte Vista
(719)587-6908
MI NERAL

t
S ou

-Lake Pueblo
-Pueblo Office

SAGUACHE

SAN
JUAN

DOLORES

EL PASO

iver
ree R

p
Re
ork
hF

SENIOR AQUATIC BIOLOGISTS

SOUTHWEST REGION
John Alves
(970)375-6721

ARA PAHOE

ELBERT

DOUG LAS

Dan Brauch
Gunnison
(970)641-7070
HINSDALE

WASHINGTON

70

r
iv e

i ver
es R
l or

Sa

YUMA

Mike Atwood
Salida
(719)530-5525FREMONT

Salida
Office

Gunnison
Office

G unn
ison Ri ver

NE

Brush
Office

a
Arik

Littleton Administrative Office

as R
ans

Do

MONTROSE

MONTEZUMA

JEFFERSON

CHAFFEE

Montrose
Office

76

Paul Winkle
Denver
(303)291-7232

Colorado Springs
Office

GUNNISON

Eric Gardunio
Montrose
(970)252-6017

er
Ri v

Headquarters

A rk

DELTA

th Pla tt e

ADAMS

PARK

Grand
Junction
Office

S ou

PHILLIPS

Mandi Brandt
Brush
(970)842-6330

Denver Administrative Office
Northeast Regional Office

Tyler Swarr
South Park
(720)576-9782

LAKE

PITKIN

MESA

CLEAR
CREEK

S UMMIT

Kendall Bakich
Glenwood Springs
(970)947-2924

MORGAN

BOULDER
GILPIN

e River
Blu

GARFIELD

Ben Felt
Grand Junction
(970)255-6126

Glenwood
Springs
Office

Fort Collins
Office

Ben Swigle
Fort Collins
(970)472-4364

Hot Sulphur
Springs
Office

r
o Rive
Colorad

LOGAN

WELD

Thompson Riv er
Bi g

Jon Ewert
Hot Sulphur
(970)725-6214

r
e Rive

RIO BLANCO

25

Poudre River

ve
r

Whit

er

Ri

en
River

Bill Atkinson
Steamboat
Springs
(970)870-2868

SEDGWICK

Kyle Battige
Fort Collins
(970)472-4396

ian

Gr e

d
na
Ca

NW

Ri v

NORTHWEST REGION
Jenn Logan
(970)947-2923
SOUTHWEST REGION
Dan Cammack
(970)275-9617
SOUTHEAST REGION
Paul Foutz
(719)227-5217

BACA

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ve

CPW Region Boundary
Created by CPW GIS 2/12/2020
314 W. Prospect St
Fort Collins, CO 80526
G:\Projects\Publications\Boundaries\AquaticBoundaries\CPW_AquaticBiologists_2020_11x17.mxd

�Appendix B
CPW Whitewater Park Fact Sheet

�C O L O R A D O

P A R K S

&amp;

W I L D L I F E

Whitewater Park Studies
RESEARCH RESULTS AND DESIGN GUIDELINES

Whitewater Park Research
With over 30 whitewater parks (WWPs) either completed or in the
planning phases, Colorado is the epicenter for WWP development in the
United States. Although WWPs provide economic and recreational
benefits for local communities (Hagenstad et al. 2000; Loomis and
McTernan 2011), they may have unintended impacts on instream biota
and stream functions, particularly when the hydraulic conditions formed
by the WWP are different from those naturally found in the surrounding
river. The impact of WWPs on habitat connectivity and instream habitat
quality have been the focus of several recent studies. Although these
studies have primarily focused on fish passage and habitat, impacts to
aquatic insects and sediment transport may also occur at WWPs.

Fish Passage Impacts
The elements that create a desirable surf wave (increased velocity,
decreased depth, a hydraulic jump, and a stable, often grouted stream
channel) create conditions that can impede fish movement. Swimming
speeds and jumping ability vary greatly between fish species.
Suppression of upstream trout movement has been documented at WWP
structures, but the degree of impact varied by fish size and characteristics
of the individual structure (Stephens et al. 2015; Fox et al. 2016). As trout
are among the strongest swimming and jumping fish species in Colorado,
small-bodied and weaker-swimming fish native to Colorado streams are
even more susceptible to habitat fragmentation associated with WWP
development.

Brown Trout

Mottled Sculpin

Fish Habitat Impacts
Although WWPs create deep pools, observed fish densities were significantly higher in natural pools than in WWP pools
(Kolden et al. 2015; Kondratieff et al. in preparation). Habitat degradation in WWPs was associated with the unnatural
hydraulics created by the recreational features and conversion of riffle habitat to drops over the wave structures.

Design Guidelines
CPW recommends that adequate environmental safeguards be included in the design and construction of WWPs to ensure
that stream functions, fisheries, and recreational fishing are not adversely impacted. Each structure must be examined on a
case-by-case basis, and monitoring and adaptive management should be included in the proposed project budget.

COLORADO PARKS &amp; WILDLIFE • 1313 Sherman St., Denver, CO 80203 • (303) 297-1192 • cpw.state.co.us

�Site Selection




Design and construction of WWPs should preserve the
natural aesthetic qualities of the river. WWPs should be
located in degraded reaches when possible and should aim
to improve the natural functions of the reach rather than
maintain degraded conditions. WWPs should not be
constructed in natural, un-modified river channels
(American Whitewater 2007).
WWP sites should be selected to minimize recreational
conflicts with anglers. There is increased potential for
boaters to displace anglers at WWP sites, especially during
the summer months. If WWP construction affects a popular
fishing location, mitigation such as new fishing access or
habitat improvements should be considered.

Ecological Design Considerations







WWP structures must be designed to allow upstream fish passage for all life stages of native and sport fishes present
throughout the annual hydrologic cycle. Fish passage is dependent on water velocity, water depth, vertical height of
structures, linear distance of the passage corridor, surface roughness, and attraction flow.
Hydraulic characteristics at WWP features generally conflict with ideal conditions for fish passage. Therefore, a fish
passage channel separate from the WWP structure may be necessary. The passage channel should meet hydraulic design
criteria for target species across a range of flows.
Hydraulic modeling of the proposed structure should be conducted during the initial design phase to evaluate potential
impacts to fish passage and habitat.
Streambed and bank disturbance due to construction activities should be scheduled for a time of year when egg
incubation is not occurring. An increase in fine sediment to the stream during incubation can suffocate developing
embryos. Erosion control and revegetation plans utilizing native riparian species should be required for each project.
WWP structures should not cause sediment deposition upstream or downstream of the structure. Sediment deposition
can eliminate fish and benthic macroinvertebrate habitats, create favorable conditions for the spread of whirling disease
in trout, and increase flooding risk if sediment deposition decreases channel capacity.
Recreational In-channel Diversion (RICD) water rights can be acquired for WWPs to provide recreational experiences
in and on the water. These protected flows should be managed to benefit boating recreation as well as conservation and
management of native and sport fish. Flows deviating from the natural flow regime, such as water calls during spawning
periods, could have adverse impacts on stream ecology (Poff et al. 1997).

References
American Whitewater, 2007. Whitewater Parks – Considerations and Case Studies.
https://www.americanwhitewater.org/content/Wiki/stewardship:whitewater_parks
Fox, B. D., B. P. Bledsoe, E. Kolden, M. C. Kondratieff, and C. A. Myrick. 2016. Ecohydraulic evaluation of whitewater parks as a fish passage barrier. Journal of the American
Water Resources Association. DOI: 10.1111/1752-1688.12397.
Hagenstad, M., J. Henderson, R. S. Raucher, J. Whitcomb. 2000. Preliminary evaluation of
the beneficial value of waters diverted in the Clear Creek Whitewater Park in the City of
Golden. Stratus Consulting.
Kolden, E., B. D. Fox, B. P. Bledsoe, and M. C. Kondratieff. 2016. Modelling whitewater
park hydraulics and fish habitat in Colorado. River Research and Applications. DOI:
10.1002/rra.2931.
Kondratieff, M. C., K. Kinzli, and E. R. Fetherman. In preparation. Eco-hydraulic evaluation
of whitewater parks as fish habitat in Colorado.
Loomis, J., and J. McTernan. 2011. Fort Collins Whitewater Park economic assessment.
Department of Agricultural and Resource Economics, Colorado State University.
Poff, N. L., J. D. Allan, M. B. Bain, J. R. Karr, K. L. Prestegaard, B. D. Richter, R. E. Sparks,
and J. C. Stromberg. 1997. The natural flow regime: a paradigm for river conservation and
restoration. BioScience 47(11): 769-784.
Stephens, T. A., B. P. Bledsoe, B. D. Fox, E. Kolden, and M. C. Kondratieff. 2016. Effects
of whitewater parks on fish passage: a spatially explicit hydraulic analysis. Ecological
Engineering 83: 305–318.

�Appendix C
CPW Fish Passage at River Structures Fact Sheet

�C O L O R A D O

P A R K S

&amp;

W I L D L I F E

Fish Passage at River Structures
RESEARCH AND DESIGN GUIDELINES

Introduction
Instream structures, such as culverts, water diversions and dams, can negatively affect fish by
fragmenting populations, reducing migratory ranges, and limiting access to habitat for spawning, feeding and refugia.
Many rivers in Colorado contain man-made structures that create partial (obstacles) or complete barriers depending on
the fish species and life stage. Habitat fragmentation associated with instream barriers is a serious threat to Colorado’s
Species of Greatest Conservation Need (SGCN) and sport
fisheries. Therefore, it is important that fisheries managers
(A)
identify and evaluate the influence of instream structures on
fish populations.

Fish Passage Research Objectives
The primary goal of fish passage research is to restore
connectivity in fragmented river systems by: (1) evaluating the
effectiveness of existing fishways; (2) evaluating the barrierpotential of common river structures; and (3) establishing fish
swim performance criteria for native and sport fishes.

Current Fish Passage Research Projects
Active fish passage research projects include: (1) evaluation of
native fish passage at existing fishways located on Front Range
transition zone streams; (2) evaluation of fish passage at
instream whitewater park structures; (3) laboratory studies to
develop fish swim and jump performance criteria for Colorado
fishes where data is lacking; and (4) development of new
techniques and technologies for investigating fish movement
and passage in rivers.

(B)

Fishway Design
Fishways, or “fish ladders”, are engineered structures
designed to facilitate passage around an obstacle or barrier.
Fishways attempt to incorporate species- and life stagespecific swimming and jumping abilities into designs. Common
elements of successful fishways include: (1) low velocity
pathways that do not exceed burst speeds or endurance
capabilities for target species (Figure A); (2) water depths that
do not limit swimming performance (Figure B); (3) vertical
drops that do not exceed the jumping ability for target species
- note that many species native to Colorado do not exhibit
jumping behaviors (Figure C); (4) sufficient attraction flow, or
the flow that emanates from a fishway entrance, to ensure
that fish can locate the fishway; and (5) maintenance of the
above design elements over the expected range of
streamflows.

(C)

COLORADO PARKS &amp; WILDLIFE • 1313 Sherman St., Denver, CO 80203 • (303) 297-1192 • cpw.state.co.us

�Fishway Examples
Some examples of successful fishways include engineered rock ramps (Figure D), constructed riffles (Figure E), and
vertical slot fishways (Figure F). Each type of fishway has advantages and disadvantages related to which fish species
and life stages are present and the conditions of the project site.

Engineered Rock Ramp

Constructed Riffle

Vertical Slot

Diversion Crest

Piney Creek,
Wyoming

Fossil Creek Reservoir
Inlet Diversion,
Cache la Poudre River

(D)

Rock Weirs

CCC Ditch,
San Miguel River

(E)

(F)

Aquatic Habitat Types
From the high-gradient, boulder-dominated, step-pool
channels of snowmelt fed mountain streams to the lowgradient, well-vegetated, pool-riffle rivers of the eastern
plains to the majestic, vertically-confined canyons on the
arid Colorado Plateau, aquatic habitats in Colorado are as
diverse as the geographic regions where they are found.
Native Colorado fishes have unique morphological
characteristics that are adapted to the natural conditions
found in each aquatic habitat type. These adaptations affect
the swimming abilities of fish, influencing how they move
through and use diverse habitats. Fisheries managers must
take the diversity of fish species into consideration when
evaluating river structures and designing fishways.

Fish Swimming Performance by Family
Family Name
Percidae (Perches)

SGCN (#)

Fundulidae (Topminnows)
Cottidae (Sculpin)
Ictaluridae (Catfish)
Cyprinidae (Minnows)
Catostomidae (Suckers)
Centrarchidae (Sunfish)

All illustrations of fish © Joseph R. Tomelleri

3

Prolonged Speed (ft/s)
0.4 - 1.2

Burst Speed (ft/s)
NA - 2.4

Jump Height (ft)
0*

Habitat Types
EP

1
0
1
13
5
1

1.3 - 1.6
1.4 - 1.7
1.3 - 2.0
1.3 - 2.4
1.3 - 2.5
1.1 - 2.9

2.6 - 3.4
3.3 - 3.9
2.0 - NA
2.4 - 4.4
2.2 - 3.2
2.6 - NA

0.1 - 0.2
0*
NA - 0.2
0* - 0.5
NA - 0.8
0.4 - NA

EP
CP, MS
EP, TZ
CP, EP, MS, RG, TZ
CP, EP, MS, RG, TZ
EP

Salmonidae (Trout)
3
2.3 - 4.0
4.5 - 7.5
1.0 - 7.0
MS, RG, TZ
SGCN = Species of Greatest Conservation Need, # of species/subspecies; * = fish species does not exhibit jumping behavior; NA =
data were not available; CP = Colorado Plateau, EP = Eastern Plains, MS = Mountain Streams, RG = Rio Grande; TZ = Transition Zone

The values reported above are summarized from multiple species within each family and are intended to support passage
for juvenile life stages. Swim speeds and jumping abilities within species are size dependent. Species-specific performance
criteria should be used whenever possible. The selection of target species for individual projects should be based on the
management objectives for the site in question. Consultation with the local Area Aquatic Biologist at CPW is strongly
encouraged during the early planning stages for any fish passage project in Colorado. The information in this fact sheet is
based on the best available data and knowledge, but is subject to revision as more information becomes available.
COLORADO PARKS &amp; WILDLIFE • 1313 Sherman St., Denver, CO 80203 • (303) 297-1192 • cpw.state.co.us

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&lt;li&gt;IP - An individual, or standard permit, is issued when projects have more than minimal individual or cumulative impacts, are evaluated using additional environmental criteria, and involve a more comprehensive public interest review.&lt;/li&gt;
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                    <text>C O L O R A D O D E PA R T M E N T O F N AT U R A L R E S O U R C E S

Tips for Handling
Live Aquatic Bait
What’s the Big Deal about
Live Aquatic Bait?
Live aquatic bait, such as minnows, crayfish,
leeches, and mud puppies, can ruin fishing
and introduce diseases to the fish already in
the lake. Mussels and their microscopic
larvae or plants can be transported in water
held in the bait buckets or live wells. Once
the boat is transported to another body of
water, the Aquatic Nuisance Species (ANS)
can be deposited into the new water. Anglers
and boaters must take care not to move
plants, animals, or water to a
new lake or stream.

• The transportation of live crayfish is prohibited on the west
slope and from Sanchez Reservoir.
• It is unlawful to transport live bait across state lines without
an import permit.

What Happens to Live
Aquatic Bait During ANS
Inspections?
Depending on the location and
type of bait, the inspection or
treatment will vary.
If you have bait in a
container or in a well with
standing water, you will be
allowed to proceed and launch with the bait as is if:
• Your receipt is from a Colorado bait dealer and

What Do the
Regulations Say about Live
Aquatic Bait?
Colorado Division of Wildlife
and Colorado State Parks ANS
regulations require that all live
aquatic bait must be purchased
from an authorized Colorado
bait dealer and must be
accompanied by a dated receipt.
The receipt is valid for ANS inspections for seven days.
• Live fish are only allowed for use as bait on the East Slope
below 7,000 feet and at Navajo Reservoir.
• In those areas, the transportation of live fish as bait is
prohibited between waters unless it was purchased from
a Colorado bait dealer, as described above.
• Fish harvested in the wild for use as bait can only be used in
the water in which it was caught and an no longer be
transported and stored for later use.

• The receipt is dated no more than seven days and
• Matches up with the bait in question.
If the receipt is older than seven days, the inspector will
perform a bait treatment to remove the threat of ANS in the
bait-water. You will be asked to remove the bait from the vessels
live well or container and place it into a holding container.
The live well or container must be drained and decontaminated
using standard decontamination procedures (hot water rinse)
before the bait is returned. The container or well water will be
replaced with water from a sealed container or non-chlorinated
source.
If you DO NOT have a receipt the live aquatic bait will not be
permitted for use and will have to be properly disposed of in
the trash. However, if the bait is not fish and was harvested
within 1⁄2 mile of the reservoir from man-made ditches or
canals, the inspector will perform a bait treatment as described
above. The exception to this is bait harvested within Bent,
Crowley, Kiowa, Otero, or Prowers counties, which can be
transported and used only within those five counties.
Out of state bait is not permitted for use.

COLORADO DIVISION OF WILDLIFE • 6060 Broadway • Denver, CO 80216 • (303) 297-1192 • www.wildlife.state.co.us

�What is Considered Live
Aquatic Bait?
Anything that needs to be kept in
water to stay alive is considered live
aquatic bait. This may include, but
is not limited to:

Tips for Speedy Inspections
We are continually working on ways to facilitate the inspection
process for our visitors, and we recommend these options:

• Crayfish, crawdads, crawfish

• Do not buy live aquatic bait over the internet; only buy from
authorized Colorado bait dealers. While you can order just
about anything from the internet and it may seem convenient,
consider what could happen to your boating, sport fish, native
frogs, snakes, and other animals if you introduce a new
competitor or a potential disease carrier to your lake!

• Frogs

• Keep your receipt and check that it has been dated.

• Water dogs, mud puppies,
salamanders

• Keep your bait in the container from the dealer.

Anything that does not need to be
kept in water is not live aquatic
bait. Examples include:

• Only take bait on the boat you plan to use that day.

• Minnows

• Use bait within seven days of purchase.
• Remove the heads of crayfish before transporting.

• Worms
• Grasshoppers
• Grubs
• Crickets

How Do I Properly
Dispose of
Unused Live
Aquatic Bait?
Dispose of unused live aquatic bait in the trash. Do not release in
the water!

You Can Make a Difference!
You can help stop the spread of Aquatic Nuisance Species (ANS)
in Colorado and the West! Before entering and when leaving any
waters always:
Clean: Remove all plants, animals and mud. Thoroughly wash
everything: boats, trailers, vehicle hitches and motors. Aquatic
plant fragments and animals can hide in mud and survive many
days out of water. Be sure to clean all fishing equipment including
waders and boots.
Drain: Completely drain every space or item that could hold
water, including live wells, bait containers, ballast and bilge tanks,
and engine cooling systems. Remove plugs, drop motor, and use
sponges and/or towels to absorb all water from bilges, live wells,
ballast tanks, and motors.
Dry: Allow sufficient time for boats and equipment to dry
completely before launching in other waters.

What Happens if I Release Live
Aquatic Bait or Plants?
Because ANS are not native to Colorado habitats, they have no
natural competitors and predators. Without these checks and
balances, introducing non-native plants or animals into Colorado
lakes and streams can be detrimental to the entire habitat. Nonnative frogs and toads eat and out-compete native species and
can be poisonous to raccoons and foxes. Plants can out-compete
native species and eliminate food sources for native and sport fish.
Predators that eat fish, such as eagles and other birds, may also be
harmed. Zebra mussels smother crayfish and native animals. They
compete with them for food by removing plankton that young fish
and other animals need to survive.

ALL PHOTOS © DOW UNLESS OTHERWISE INDICATED
RUSTY CRAYFISH PHOTO © PHIL MYERS,
MUSEUM OF ZOOLOGY, UNIVERSITY OF MICHIGAN
QUAGGA AND ZEBRA MUSSELS PHOTO
© MICHIGAN SEA GRANT

5/2011 – 75,000

Dispose: Properly dispose unused live bait into trash containers,
not into the water. Properly dispose of aquarium or classroom
animals or plants, do not place them in any body of water or
natural setting.
For more information call the
Colorado Division of Wildlife at
(303) 291-7295 or Colorado State
Parks at (303) 866-3437.
Please Clean, Drain, and Dry
your boat and gear to keep
boating open in Colorado.

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                <text>Live aquatic bait, such as minnows, crayfish, leeches, and mud puppies, can ruin fishing and introduce diseases to the fish already in the lake. Mussels and their microscopic larvae or plants can be transported in water held in the bait buckets or live wells. Once the boat is transported to another body of water, the Aquatic Nuisance Species (ANS) can be deposited into the new water. Anglers and boaters must take care not to move plants, animals, or water to a new lake or stream.</text>
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                    <text>COLORADO DIVISION OF WILDLIFE

Stop the Spread of
Invasive Species
What are Aquatic
Nuisance Species?
Aquatic Nuisance Species (ANS) are a significant and
rapidly growing threat to Colorado’s water supply and to
boating and fishing recreation. ANS are invasive animals,
plants, and disease-causing pathogens that are “out of
place” in Colorado’s rivers, lakes, streams, and wetlands.
They are introduced accidentally or intentionally outside of
their native range. Because they are not native to Colorado
habitats, they have no natural competitors and predators.
Without these checks and balances, the invaders are able to
reproduce rapidly and out-compete native species for space
and nutrients. ANS have harmful effects on natural
resources, water supply systems and recreational
opportunities. Once introduced, most invasive species
cannot be eradicated and cost millions of dollars to
manage. Preventing the introduction and spread of ANS
is critical!
PHOTO BY MICHIGAN SEA GRANT

Zebra and Quagga Mussels
Zebra and quagga mussels grow and reproduce quickly
and have significant economic, ecological and recreation
impacts. They degrade water quality. They attach to most
underwater structures, clog water supply pipes and encrust
and smother native species. As filter feeders they eat most
of the food at the bottom of the food chain, leaving little or
nothing for native aquatic species. They are transported to
uninfested waters on trailered watercraft, or in bait buckets,
live wells, bilge water, motors, gear, and equipment.
RUSTY CRAYFISH PHOTO BY PHIL MYERS, MUSEUM OF ZOOLOGY, UNIVERSITY OF MICHIGAN
NEW ZEALAND MUDSHELL PHOTO BY MICHIGAN DEPARTMENT OF ENVIRONMENTAL QUALITY
EURASIAN WATERMILFOIL PHOTO BY MICHIGAN SEA GRANT

Rusty Crayfish
Rusty crayfish eat small fish, insects,
and fish eggs. They also eat aquatic
vegetation, damaging underwater
habitat that is important for fish
spawning, cover, and food. They are
aggressive and displace native crayfish.
They have been introduced to
uninfested water by anglers who use the
crayfish as bait and throw unused bait
into the water or illegally stock them as a prey base for fish.
New Zealand Mudsnail
New Zealand mudsnails (NZMS)
compete with native invertebrates—
native mussels, mayflies, caddisflies, and
other aquatic insects—for space and
food. NZMS reduce these prey sources
for fish and are not a good food source
themselves. Their hard shell allows them
to pass through a fish gut unharmed.
NZMS are carried to uninfested waters
on fishing gear. They can survive up to 50 days on a damp
surface and several days on a dry surface.
Eurasian watermilfoil
Eurasian watermilfoil forms
dense mats that restrict
swimming, fishing, and
boating and clog water intakes.
The mats shade and choke out
native aquatic plants. The
decaying plants foul beaches
and decrease oxygen levels in
the water, destroying habitat
and food needed by fish and
birds. The mats slow the flow
of water in ditches, rivers, and streams and create ideal
mosquito habitat. Eurasian watermilfoil reproduces by
seeds, fragmentation and winter buds. Any plant fragment
can start a new infestation.

COLORADO DIVISION OF WILDLIFE • 6060 Broadway • Denver, CO 80216 • (303) 297-1192 • www.wildlife.state.co.us

�PHOTO BY BRAD HENLEY

Clean Boats and Gear Can Stop
the Spread of Invasive Species!

Attention Anglers!
Anglers who use waders should scrub the bottom of waders and
boots with a wire brush and remove all mud, plants and organic
materials in between each and every use. Anglers should then
perform one of the following disinfection recommendations
before going into the next body of water:

DRAIN—Completely drain every
conceivable space or item that
could hold water, including live
wells, bait containers, ballast and
bilge tanks, and engine cooling
systems.

OPTION 1—Submerge waders and gear in a large tub filled with
50% Formula 409 and water for at least 10 minutes, scrubbing
debris and visually inspecting waders and gear for snails before
rinsing. Rinse water must be from a New Zealand mudsnail-free
source (to avoid re-infection) and the chemical bath must be
properly disposed of away from the water body.

DRY—Allow sufficient time for
boats and equipment to dry
completely before launching in
other waters.

OPTION 2—Submerge waders and gear in a large tub filled with
1:15 of Sparquat 256 institutional cleaner (3.1% concentration)
and water for at least 10 minutes, scrubbing debris from the gear,
and visually inspecting the gear for snails before rinsing. Rinse
water must be from a New Zealand mudsnail free source (to avoid
re-infection), and the chemical bath must be properly disposed of
away from the water body.

PHOTO BY ELIZABETH BROWN, DOW

Attention Boaters!
CLEAN—Remove all plants, animals and mud. Thoroughly wash
everything: boats, trailers, vehicle hitches and motors. Aquatic
plant fragments and animals can hide in mud and survive many
days out of water. Be sure to clean all fishing equipment including
waders and boots.

DISPOSE BAIT—Properly
dispose unused live bait into trash
containers, not into the water.

NEVER DISPOSE—Of aquarium or classroom animals or plants
in any body of water or natural setting.
REPORT—If you find anything that you think is an invasive
species on your boat or in a water body, report it to the DOW by
emailing ReportANS@state.co.us or call (303) 291-7295.

OPTION 3—Spray or soak waders and gear with water greater
than 140º Fahrenheit for at least 10 minutes.
OPTION 4—Dry your waders and equipment completely for a
minimum of 10 days in between each use (remember that
mudsnails can survive several days out of water).
OPTION 5—Place waders and boots in a freezer overnight
between each use.

The Colorado Division of Wildlife is the state agency responsible for protecting and managing wildlife and its
habitat, as well as providing wildlife-related recreation. The Division is funded by hunting and fishing license
fees, federal grants and Colorado Lottery proceeds through Great Outdoors Colorado.
2/2011 – ??,000

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                    <text>State of Colorado
Zebra and Quagga Mussel
Management Plan

LAST REVISED
August 24, 2009

�Table of Contents
Executive Summary ...................................................................................................................................... 3
Partners ......................................................................................................................................................... 4
State Government ...................................................................................................................................... 4
Federal Government .................................................................................................................................. 5
Local Governments .................................................................................................................................... 5
Recreational User Groups / Non-Governmental Organizations ................................................................ 5
Early Detection .............................................................................................................................................. 6
Statewide Sampling and Monitoring .......................................................................................................... 6
Equipment Decontamination ..................................................................................................................... 7
Preserving and Shipping Samples ............................................................................................................ 7
Identification of Samples ........................................................................................................................... 7
Notification of Infested Water .................................................................................................................... 7
Reporting ................................................................................................................................................... 8
Containment and Prevention: watercraft inspection and decontamination Program ................................... 9
Containment at Infested Waters .............................................................................................................. 11
Prevention Targeting Out of State Boats ................................................................................................. 14
Prevention Targeting High Risk Waters .................................................................................................. 14
Roving Watercraft Inspection and decontamination Patrol ..................................................................... 18
Watercraft Inspection and Decontamination Standards, Training, Certification &amp; Quality Control ............. 19
Legal Authority ............................................................................................................................................ 21
State of Colorado ANS Act (SB08-226) .................................................................................................. 21
State ANS Regulations ............................................................................................................................ 21
CDOW Aquatic Health Regulations: ........................................................................................................ 21
State Fish Hatchery Program ...................................................................................................................... 22
ANS Technology/Tracking .......................................................................................................................... 22
Watercraft Inspection Seals..................................................................................................................... 20
Watercraft Inspection and Decontamination Tracking Database ............................................................ 23
Sampling and Monitoring Database ........................................................................................................ 24
Communication and Information ................................................................................................................. 24
Education .................................................................................................................................................... 25
Research ..................................................................................................................................................... 26
Volunteer Opportunities .............................................................................................................................. 27
Staffing Requirements................................................................................................................................. 28
Summary of Plan Recommendations ......................................................................................................... 28
Implementation Table .................................................................................... Error! Bookmark not defined.
Acknowledgements ..................................................................................................................................... 34
Literature Cited ........................................................................................................................................... 34
Appendices Table of Contents .................................................................................................................... 35

2

�Executive Summary
The Colorado Zebra/Quagga Mussel Management Plan (ZQM Plan) outlines a statewide
collaborative effort to detect, contain, and substantially reduce the risk of the spread and further
infestation by zebra/quagga mussels in Colorado. The Plan is coordinated by the Colorado
Division of Wildlife (CDOW) as part of the State Aquatic Nuisance Species (ANS) Program.
The Plan’s primary components are early detection and rapid response, containment, prevention
and education/outreach.
The backbone of the ZQM Plan is mandatory watercraft inspection and decontamination to
prevent the spread of mussels overland on recreational watercraft. The watercraft inspection and
decontamination component focuses primarily on the highest risk watercraft coming from out-ofstate, regardless of residency, and those that have recently been in infested waters. According to
State ANS Regulations, it is mandatory for all watercraft coming from out-of-state and those
leaving an infested water to get an inspection and, if necessary, get decontaminated prior to
launching in any waters of the state.
Standardized watercraft inspection and decontamination protocols have been implemented at a
variety of inspection stations throughout the state to provide ample opportunity for watercraft
owners to comply with the mandatory inspection regulations. Inspection and decontamination
station locations will include, but are not limited to, (1) infested lakes and reservoirs, (2) state
offices convenient for entry into Colorado, (3)private industry locations such as marine dealers,
(4) high risk non-infested waters and (5) mobile roving watercraft inspection and
decontamination units targeting random lakes and reservoirs. Each station placed at high risk
waters will be multi-purpose, offering preventative or containment inspections to those entering
or leaving that specific water body, and inspections and decontaminations for out-of-state
watercraft.
Bodies of water, and water-based recreation, are often managed by multiple interests: federal,
state, county and municipal agencies, marina operators and private entities. A goal of the ZQM
Plan is to ensure watercraft inspection and decontamination stations placed at lakes and
reservoirs are operated by the recreational manager with support from CDOW (law enforcement,
training, certification, educational materials, signage, forms, etc). Due to the highly invasive
nature of zebra and quagga mussels and their limited distribution in Colorado and the western
United States, it is of critical importance that these entities cooperate to achieve the ZQM Plan's
goals for waters of the state, regardless of jurisdiction.
ANS, especially zebra and quagga mussels, can result in severe impacts to water supply and
distribution infrastructure for municipal, industrial and agricultural uses. These mussels
negatively impact fisheries and all forms of water-based recreation (particularly boating and
fishing interests). ANS can cause damage to watercrafts, motors and inhibit access
opportunities. The economic impacts associated with mussel invasions can be devastating. In a
survey of Eastern U.S. and Canada water users in 1995, Oneill found 339 facilities reported total
zebra mussel related expenses of $69,070,780 (Oneill, Jr., C.R. 1997).

3

�The CDOW places a high importance on preventing and controlling zebra and quagga mussels in
Colorado to protect not only our invaluable wildlife resources, but also our recreation and
tourism industry, water storage and distribution systems, agricultural production and the state’s
overall economy. The CDOW encourages the larger water community to conduct facility
assessments and implement preventative measures to reduce the risk of transportation through,
and invasion of, water distribution systems. There are currently few, if any, proven control
methods to mitigate the downstream movement of juvenile veliger mussels in natural
environments. However, there are preventative and control measures that can be taken in water
distribution systems. References outlining specific control measures are listed in the
Appendices.
CDOW encourages all partners and citizens to take every precaution to stop the spread of zebra
and quagga mussels and other aquatic nuisance species.
The ZQM Plan is a working document and will be updated regularly as implementation
progresses and new information becomes available.

Partners
Preventing the spread of zebra and quagga mussels and other aquatic nuisance species requires a
high level of cooperation and coordination between federal, state, county and municipal
agencies, marina operators, private entities and recreationists. Many of these entities have
partnered together to form the Zebra and Quagga Mussel Task Force (ZQM Task Force) to
develop and implement the ZQM Plan and to periodically review and update it. The ZQM Task
Force is an ongoing collaborative work group that acts as a permanent zebra and quagga mussel
management team and shares information and coordinates on field projects, educational efforts,
protocol development, public relations, trainings and obtaining resources. Detailed information
concerning the roles and jurisdiction of each entity is provided in Appendix A. Due to the multijurisdictional nature of Colorado waters, the ZQM Plan recommendations apply to all partners;
for no single entity is responsible for, or capable of, implementing all of the necessary actions
needed to protect Colorado waters from invasive mussels or other ANS.

State Government
The Colorado Department of Natural Resources (CDNR) has authority to manage wildlife,
recreation, and water resources in Colorado. The two CDNR divisions that manage for zebra
and quagga mussels are the Colorado Division of Wildlife and Colorado State Parks. The
Colorado Water Conservation Board and the Colorado Division of Water Resources are
integral partners in the zebra and quagga mussel program. Additional state entities involved
in the ZQM program include the Colorado Wildlife Commission, the Colorado Parks Board,
the Colorado Fish Health Board, Colorado Department of Public Health and the
Environment, Colorado Department of Agriculture, Colorado Department of Revenue,
Colorado Office of Economic Development and International Trade, and the Colorado
Tourism Office.

4

�Federal Government
No single federal agency has clear authority over all aspects of ANS management, but many
agencies have programs and responsibilities that address aspects of the problem, such as
importation, interstate transport, exclusion, control, and eradication. Federal ANS
management activities are coordinated through the ANS Task Force created by the National
Aquatic Nuisance Prevention and Control Act of 1990 and amended in 1996 as the National
Invasive Species Act. In February 1999, President Clinton signed Executive Order (EO)
13112, which requires all federal agencies to collaborate in developing a national invasive
species management plan to include terrestrial and aquatic species. Federal partners for the
Colorado ZQM Program include the U.S. Army Corps of Engineers (ACOE), U.S. Bureau
of Land Management (BLM), U.S. Bureau of Reclamation (Reclamation), U.S. Fish and
Wildlife Service (USFWS), U.S. Forest Service (USFS), National Park Service (NPS), and
the Bureau of Indian Affairs (BIA).

Local Governments
Cooperation from Colorado cities and counties is critical to the success of the ANS Program.
Many waters in the state are owned and/or managed by local governments. Several Front
Range municipalities have taken a pro-active approach to the zebra/quagga mussel problem
by implementing watercraft inspection and decontamination at their reservoirs and lakes in
2008. Those governments are City of Aurora, City of Boulder, City of Denver, and City of
Westminster. CDOW will continue to work with local governments to mitigate the spread
and impacts from ANS, including zebra and quagga mussels. By working together to
implement the ZQM Plan, we greatly increase the probability of preventing the spread of
ANS in Colorado.

Recreational User Groups / Non-Governmental Organizations
There are many non-governmental organizations (NGOs) that have an interest in preventing
the spread of invasive species. In 2005, the Colorado Women Fly-Fishers located a new
population of New Zealand mudsnail in the South Platte and was integral in rapid response.
In 2007, The Nature Conservancy and Trout Unlimited played crucial roles in the
development of the State ANS Management Plan and continue to serve on the State ANS
Task Force. In 2008, private industries such as the two marinas at Lake Dillon, Red
Mountain RV at Wolford Reservoir, and marine dealers, such as Tommy’s Slalom, Inc. took
an active role implementing watercraft inspection and decontamination at their locations.
These entities are crucial to the success of the ZQM Plan and the CDOW hopes that more
partnerships can be formed to expand programs and reach a larger percentage of Colorado’s
residents and visitors for education, communication, volunteerism and early detection and
rapid response. The CDOW will direct its messages to the following recreationists and
special interest groups; marinas, marine dealers, boating clubs, fishing guides, anglers,
waterfowl hunters, Trout Unlimited, Ducks Unlimited, BASS, CO Walleye Association,
Muskies Inc, 5280 Bass Hunters, Federation of Fly Fishers, The Nature Conservancy, and
many more.

5

�Early Detection
Statewide Sampling and Monitoring
CDOW is the lead agency for statewide ANS Early Detection Sampling and Monitoring.
Beginning in 2005, ANS sampling and monitoring was focused on collecting baseline data on all
species present at survey locations, while specifically checking for over 35 plant and animal
species. Following the discovery of zebra mussels at Lake Pueblo in 2007, the ANS early
detection program was redesigned in 2008 to focus on an intense ZQM sampling program with
temporary full-time technicians utilizing three sampling methods. First, plankton tows were
performed to sample for veligers (the planktonic larval form of zebra and quagga mussels).
Second, artificial substrates were deployed at set locations and were checked for attached adult
mussels. Third, shoreline surveys were performed to look for adults and other ANS. Protocols
for standard sampling methods can be found in Appendix B-C.
Waters are sampled based on a risk assessment conducted specifically for zebra and quagga
mussels. The risk assessment was completed in June 2008 and identified 19 very high risk
waters, 17 high risk waters, 58 medium risk waters, and 64 low risk waters (Appendix D).
Technicians visited very high and high risk waters bi-weekly, medium-risk waters monthly and
low-risk waters periodically (Appendix F). The sampling season and schedule was determined
by surface water temperatures which influence plankton productivity. Research has shown that
plankton productivity is positively correlated with veliger production. The sampling began as
soon as the surface temperature reached 50⁰ F, the temperature conducive to the highest plankton
productivity and continued until the temperature dropped below that level. CDOW technicians
conducted all three sampling methods and also performed the microscopy analysis on plankton
tow samples.
In 2009, aggressive sampling will continue according to specifications determined in 2008 and
revisions to protocol as recommended by the Colorado Blue Ribbon Panel Report (February
2009) and the 100th Meridian Initiative’s Interagency Dreissena Monitoring Plan for Western
Waters (May 2009). CDOW technicians will sample all 158 “at risk” waters specifically for
zebra and quagga mussels. Technicians will also resume activities begun in 2005 to sample for
all ANS while collecting baseline data. Identification of specimens will be conducted at the
AAHL.
The State ANS Regulations require all persons conducting sampling for aquatic nuisance
species, including zebra and quagga mussels, to be permitted by CDOW. Due to the prohibited
nature of ANS, the CDOW Special Collections Permit for wildlife species collection does not
apply. Any entity intending to conduct sampling for aquatic nuisance species must request a
permit in writing to the CDOW ANS Program. Only the Director of the Division of Wildlife can
approve the permit request. Entities requesting permits should attend the State ANS Sampling
and Monitoring Training School taught annually by CDOW and Reclamation in April and
August.

6

�Equipment Decontamination
Every precaution is taken to ensure that efforts made to sample and monitor for ANS do not
further endanger the state’s waters. All persons, including DNR employees, conducting work
activities in Colorado waters are required by the ANS Act to decontaminate their watercraft and
all field equipment between water bodies. Work activities include sampling, scientific
collection, infrastructure maintenance, filling water trucks, pumping equipment for wildfire
fighting or mineral extraction, and all other water-based activities. Disinfection is especially
important between sampling efforts in different reaches of the same stream, or between
individual waters in order to minimize the chance of spreading zebra and quagga mussels and
other ANS such as whirling disease, weeds and/or parasites to uninfected areas.

Preserving and Shipping Samples
Standard procedures to collect, preserve, and ship samples of adult and veliger larvae have been
developed by AAHL (See Appendix B-C). These procedures ensure that the specimens can be
positively identified and that accurate information can be conveyed between agencies. There are
many entities performing water quality monitoring in Colorado. Those entities are encouraged to
cooperate with CDOW to expand the reaches of the state sampling program to more waters.

Identification of Samples
The CDOW is able to provide identification services to partners for all ANS. ZQM
identification relies on a three-stage process for positive confirmation of zebra or quagga mussel
veligers in plankton tow samples. The first phase is a visual identification using a microscope or
FlowCAM (digital video scanning/recording plankton identification instrument). Following the
visual identification of a suspected veliger, the sample is then analyzed by a laboratory for DNA
analysis. The lab first performs polymerase chain reaction (PCR) testing to determine if there is
zebra/quagga mussel DNA in the sample. If the PCR test is positive, the laboratory performs
gene sequencing to determine the specific mussel species. For veliger identification, a single
positive ID with microscopy, PCR and gene sequencing is required to declare a body of water
positive for zebra or quagga mussels.
Adults are identified visually by trained scientists. DNA verification may or may not be required
to confirm the identification of an adult mussel.

Notification of Infested Water
The CDOW will declare a water positive for zebra or quagga mussels based on one set of
positive test results on a single sample from the multi-tier 3-phase identification process
(microscopy, PCR and gene sequencing - both ocular and molecular) or adult identification. If
disparaging results are encountered, a body of water may be declared suspect for zebra or quagga
mussels until confirmation can be obtained. Once a body of water is declared positive for
mussels, genetic confirmation of future monitoring samples containing veligers is may no longer

7

�be required. However, sampling will increase after detection to monitor growth rate and spread
of the invasion.
Historically, CDOW communicates with the land and water managers throughout the mussel
sampling and identification process. CDOW notifies both internal staff and critical partners
(land owner, water owner, recreation manager, facilities manager, etc.) at the conclusion of the
second testing phase, if there is a positive PCR result. Notification is prior to the third and final
phase, speciation via gene sequencing. Early communication aids in preparing rapid response
plans and drafting communication documents, such as a joint press releases, to speed up public
notification. The public is notified directly after the final test results through a CDOW press
release (see Appendix G).

Reporting
Any person who knows that an ANS is present or suspected at a specific location is required by
the ANS Act to immediately report the sighting to the Division of Wildlife Invasive Species
Program, 6060 Broadway, Denver, CO 80216. Within 10 days, the Division will notify the
reporter of the identification results, or the status of the identification process.
All authorized agents and qualified peace officers performing watercraft inspection and
decontamination are required to send suspect samples or known ANS taken from a watercraft or
water body to AAHL immediately.
Any persons or agencies performing sampling or monitoring for ANS must first obtain an ANS
sampling permit from CDOW. Permit holders are required to report according to rules set forth
in the State ANS Regulations.
There are four options for reporting:
a. Federal ANS Hotline: 1-877-STOP-ANS
b. State ANS Hotline: 1-303-293-6531
c. Email: ReportANS@state.co.us
d. Website: www.colorado.gov/wildlife
Reports should be accompanied by standard CDOW forms, supplied on the website and by
request. If they are not available, useful data to be included in a standard report is:
1. Date/Time that specimen was found
2. Exact location of sighting (water body and specific location on water body)
3. Suspected species
4. Name and contact information of the collector

8

�Containment and Prevention: Watercraft Inspection and
Decontamination Program
The best method of protection against an invasive mussel introduction is through preventative
measures. Prevention is much less expensive than containment or control efforts. Although
containment at infested waters is the top priority, CDOW recommends that focus be placed on
prevention through field watercraft inspection and decontamination, in conjunction with
education and information efforts.
The goal of the State ANS Program in CDOW is to coordinate and implement seamless and
consistent watercraft inspection and decontamination stations statewide. The priorities are based
on the risk assessment conducted by CDOW in June 2008, which focuses on the risk of mussels
being introduced by both the recreational and downstream vectors, in addition to placement in
the watershed.
A revised risk assessment is recommended. The goal is to complete two risk assessments, with
the first focused on risk of introduction due to recreational pressures or geographic
approximation to infested waters, and the ability for the mussels to establish based on water
chemistry parameters. The second should be focused on the risk of high negative impact if a
sustainable mussel population were to be established. Currently, there is not enough data to
complete these assessments. In order to accurately assess risk, water samples must be collected,
analyzed and compiled to determine habitat suitability.
Assessment
Probability of
ZQM being
introduced and
able to establish
Probability of
high negative
impact if
mussels were to
be established

Assessment
Criteria
Susceptibility
Habitat Suitability
Potential impact to
water infrastructure
Potential impact to
fisheries

Criteria Description
Probability of an introduction due to recreational pressures or
geographic approximation to infested water.
The probability of ZQM being able to sustain a viable
population if introduced based on water chemistry parameters.
Risk of impacts to facilities, location in watershed and impact
to municipal, industrial and agricultural water storage and
supply.
Risk of impact to fisheries.

The goal of the watercraft inspection and decontamination program is to ensure a seamless
program across jurisdictions, which enable out-of-state and resident boaters a convenient process
to ensure ANS are not being transported on watercraft. These stations will be located at infested
waters, high risk waters and convenient locations so that it is relatively easy for boaters to
prevent the spread of ANS by complying with the inspection requirement. Watercraft inspection
and decontamination stations that are not located at a specific water body will be operated by the
owner (for example, CDOW will operate stations at CDOW offices; marine dealers may operate
stations at their dealership, etc).

9

�Site-specific plans will be written for each body of water on the risk assessment. These plans
will be written in phases over many years beginning with the highest risk waters. The site
specific watercraft inspection and decontamination stations will be founded on partnerships
between CDOW and the land, water, recreation owners and managers at each specific body of
water. The watercraft inspection and decontamination station will be operated by the
recreational manager, owner or a private entity; with support from CDOW in the form of law
enforcement support, training, certification, sampling/monitoring, educational materials, signage,
standard forms and outreach. Although CDOW will be the coordinating agency for each sitespecific effort, it will require the collective efforts and resources from all direct partners to
implement the field watercraft inspection and decontamination program.
Watercraft inspection and decontamination stations will be multi-purpose, offering preventative
or containment inspections to those entering or leaving that specific water body and
inspections/decontaminations for watercrafts coming from outside of Colorado. The inspection
and decontamination stations, regardless of management entity, will operate according to the
Official State of Colorado Watercraft Inspection and Decontamination Procedures (adopted into
regulation on February 20, 2009 and published in March 2009.).
The watercraft inspection and decontamination program will provide a large network of
opportunities for boaters to minimize the risk of an introduction of zebra and quagga mussels,
and other invasive species into state waters. The inspection and decontamination program has
four components, listed below:
Component

Containment at Infested
Waters

Prevention Targeting
Out-of-State Watercrafts

Prevention at Uninfested
Waters

Roving Watercraft
Inspection and
Decontamination Patrols

Definition
No trailered watercraft will leave infested water without an
inspection. All persons with trailered motorized watercraft must
submit to an inspection and if necessary decontamination prior to
exiting an infested water.
If an inspection station is inoperable or not available, the boat must
get an inspection and if necessary decontamination at a state
certified location prior to launching in any other water of the state.
All trailered watercraft registered in a state other than Colorado, and
all Colorado registered watercraft that have been in out of state
waters within the last 30 days, are prohibited from launching on any
water of the state without a prior inspection and if necessary,
decontamination.
When required by the lake or reservoir, all trailered watercraft must
submit to an inspection and if necessary decontamination prior to
entering a high, medium or low risk water that is negative for ANS
to prevent an introduction.
CDOW roving inspection patrols will randomly set up watercraft
inspection and decontamination stations at the waters without a
permanent inspection program in place (typically medium and low
risk waters). Boaters should expect to be inspected prior to
launching on any water of the state.

10

�Containment at Infested Waters
It is critical to prevent contaminated watercraft from spreading ZQM veliger or adults from
infested waters to uninfested waters. There are currently no effective methods to control the
downstream movement of veligers in the natural flow of water. We can, however, mitigate the
potential overland spread from watercraft. It is essential that boats recreating on infested waters
be inspected and, if necessary, decontaminated prior to launching in any other waters.
As of April 2008, there are seven positive waters and one suspect water in Colorado,
summarized below. It is the highest priority that no watercraft leaves these waters without being
inspected by a state authorized agent and decontaminated, if necessary. The majority of
reservoirs in Colorado are owned and managed by federal, state, local and private entities.
Typically, there are a minimum of three to five entities involved in creating and implementing a
site-specific field response. It is critical that all entities involved work together to contain
infestations.
Positive Water
Pueblo
Lake Granby
Shadow Mountain
Willow Creek
Grand Lake
Tarryall Reservoir
Jumbo Reservoir

Owner
Bureau of Reclamation
Bureau of Reclamation
Bureau of Reclamation
Bureau of Reclamation
Town of Grand Lake
CDOW
Julesburg Irrigation District

Recreation Manager
State Parks, CDOW
U.S. Forest Service
U.S. Forest Service
U.S. Forest Service
U.S. Forest Service
CDOW
CDOW

Date Tested Positive
January 17, 2008
July 10, 2008
September 26, 2008
September 26, 2008
September 26, 2008
October 8, 2008
October 8, 2008

Suspect Water
Blue Mesa
Reservoir

Owner

Recreation Manager

Date Tested Positive

Bureau of Reclamation

National Park Service

February 19, 2009

1. Pueblo Reservoir – Positive for zebra mussels on January 17, 2008. Positive for both
zebra and quagga mussels on September 26, 2008. This reservoir is owned and operated
by the Bureau of Reclamation, with recreational management by State Parks and CDOW.
State Parks is the lead agency on Pueblo watercraft inspection and decontamination
station. In 2008, parks operated the watercraft inspection and decontamination program
twenty-four hours per day, seven days per week, for approximately nine months each
year. The program began in March 2008 utilizing a $1M grant from the Colorado Water
Conservation Board (CWCB). Since July 2008, the program has been funded by the
ANS Act allocation. In 2009, parks is operating the watercraft inspection and
decontamination station sixteen hours per day, seven days a week
2. Lake Granby – Positive for quagga mussels on July 10, 2008. Owned by the Bureau of
Reclamation, managed by the U.S. Forest Service, water interests owned by Northern
Colorado Water Conservancy District. CDOW was the lead agency on the watercraft
inspection and decontamination program in 2008 and 2009. Beginning August 15, 2008,
CDOW hired temporary FTE to perform watercraft inspection and decontamination at the
11

�boat ramps, Friday through Sunday through October 15th. In 2009, the inspection stations
were operated by CDOW beginning May 15th from 6:00 am – 8:00 pm at Sunset and
Stillwater Ramps. Both ramps remain open at night and Arapahoe Bay remains open
without inspection in 2009. Additional educational and watercraft inspection and
decontamination opportunities are provided in September and October to private slip
owners and marina operators to assist with boats leaving that have been in the water all
season.
3. Grand Lake – Positive for quagga mussels on September 26, 2008. Owned and
managed by the Town of Grand Lake. Connected to Lake Granby. CDOW hosted a
watercraft inspection and decontamination day on September 27, 2008 to check
watercrafts leaving for the season and to educate homeowners and marina slip renters. In
2009, the CDOW operated an inspection station on the public ramp beginning May 15th
from 6:00 am – 8:00 pm. The public ramp remains open at night without inspections.
Additional educational and watercraft inspection and decontamination opportunities are
provided in September and October to private slip owners and marina operators to assist
with boats leaving that have been in the water all season.
In August 2009, the Greater Grand Lake Shoreline Association (GGLSA) adopted the
zebra/quagga mussel “drop a brick” program to voluntarily assist the CDOW effort to
monitor for mussels. Homeowners deployed state provided bricks as substrate for mussel
sampling and pledged to check the bricks and their infrastructure for mussels and send
any suspects to the AAHL.
4. Shadow Mountain Reservoir – Positive for quagga mussels on September 26, 2008.
Owned by the Bureau of Reclamation, managed by the U.S. Forest Service, water
interests owned by Northern Colorado Water Conservancy District. Connected to Lake
Granby and Grand Lake. In 2009, the CDOW operated inspection stations on the Green
Ridge Ramp beginning May 15th from 6:00 am – 8:00 pm. Hilltop Ramp was closed by
the USFS to assist with this effort. The ramps remain open at night without inspections.
Additional educational and watercraft inspection and decontamination opportunities are
provided in September and October to private slip owners and marina operators to assist
with boats leaving that have been in the water all season.
5. Willow Creek Reservoir - Positive for quagga mussels on September 26, 2008.
Owned by the Bureau of Reclamation, managed by the U.S. Forest Service, water
interests owned by Northern Colorado Water Conservancy District. Connected through a
pipeline to Shadow Mountain Lake. Willow Creek is closed to trailered watercraft use in
2009 by the USFS to assist with containment.
6. Tarryall Reservoir - Positive for quagga mussels on October 8, 2008. Owned and
managed by CDOW. Beginning July 17, 2008, CDOW temporary FTE inspectors staffed
the boat ramps from dawn until dusk Thursday through Monday. The reservoir was
closed to boating for the season on October 31, 2008. In 2009, the reservoir opened
when boat inspections began May 1st at the north boat ramp from 6:00 am – 10:00 pm,
Thursdays through Mondays. Overnight beaching of boats is prohibited. The reservoir is
12

�not accessible to trailered watercraft when inspectors are not present. The reservoir will
once again close to boating on October 31, 2009.
7. Jumbo Reservoir - Positive for quagga mussels on October 8, 2008. Owned by the
Julesburg Irrigation District and managed by CDOW. At the time of positive test results,
Jumbo was closed to boating due to potential safety issues and conflicts between anglers
and waterfowl hunters. Only permitted hunters were allowed to launch watercraft and
they were given strict instructions to clean, drain, dry. In 2009, boat inspections began
May 1st at the east boat ramp (near the outlet tower) from 6:00 am – 10:00 pm, seven
days a week and will conclude October 1st. All other ramps will only be open to handlaunched boats. All boat ramps will be closed at night. The reservoir is not accessible to
trailered watercraft when inspectors are not present. Overnight beaching of boats is
prohibited. Boat inspections and the general boating season will end on October 1st.
Boating is prohibited Oct. 1 through last day of regular goose season, except handpropelled, non-motorized, craft used to set and pick up decoys and retrieve downed
waterfowl.
8. Blue Mesa Reservoir – Suspect for Quagga Mussels – National Park Service collected
plankton tow samples for analysis at Reclamation in 2008. On February 19, 2009,
Reclamation reported inconclusive results which indicated there were positive
microscopy results but negative DNA results from a single sample in March 2008.
Subsequently, a single sample collected in May 2008 also showed inconclusive results
which indicated there were negative microscopy results but positive DNA results.
Sampling will increase in 2009 to determine if mussels are present in the reservoir or not.
NPS and CDOW have partnered to implement both containment and prevention protocols
for the 2009 boating season. Boat inspections began May 8th at Elk Creek, Stevens Creek
and Lake Fork Boat Ramps from 5:30 a.m. – 9 p.m., 7 days a week. All other boat ramps
are closed to trailered watercraft. Ramps will be closed to nighttime use; however,
overnight beaching will be allowed.
A multi-agency team coordinated by CDOW will determine the future management
agreement for the above infested bodies of water to be implemented in 2010. This sitespecific planning effort is scheduled to be concluded before March 2010. The
implementation of site-specific plans are dependent on funding and available resources.
If waters are found to be positive for zebra or quagga mussels in the future, and a watercraft
inspection and decontamination program is not already in place, CDOW will lead a response
team consisting of the recreational managing agency, the infrastructure owner, the water
owner, the land owner, local governments, concessioners and all interested parties to
determine the containment strategy and necessary resources to implement the strategy. Each
site-specific management plan will be a collaborative effort and outline the implementation
strategy for that specific body of water. Implementation of those plans will be dependent on
funding and resources.

13

�Site-specific mussel management plans are strongly encouraged on all bodies of water with
trailered motorized watercraft, especially those high in a watershed, as a preventative
measure. CDOW coordinated 22 site specific management plans in 2009 and is willing to
coordinate the site-specific management planning process for additional waters in 2010.

Prevention Targeting Out of State Watercraft
All trailered motorized watercraft coming into Colorado from outside of the state, regardless of
residency, must be inspected and, if necessary, decontaminate prior to launching on waters of the
state, according to state regulations. Watercraft inspection and decontamination stations will
provide ample opportunity for compliance. This option puts the responsibility on the
recreational user to minimize the potential for spread by their watercraft. Fixed watercraft
inspection and decontamination stations will be located near Colorado’s borders or in high
population density locations. Watercraft inspection and decontamination stations located at high
or medium risk waters will also provide inspections for out-of-state watercraft.
These watercraft inspection and decontamination stations form a network for the highest risk
watercraft (out-of-state watercraft and Colorado-registered watercraft leaving and returning) to
be inspected and if necessary, decontaminated, at locations throughout the state. The following
prioritized list details the steps to implement this segment of the program. Items 1 through 4 will
be implemented in 2009. Items 5 through 7 will be phased in over time and are expected to be
fully implemented during the 2010 boating season.
1. Regulations requiring all out-of-state registered watercraft and in-state registered
watercraft returning to Colorado to be inspected, decontaminated (if necessary) and
tagged prior to launch in Colorado waters
• Completed February 20, 2009
2. Establishing and enforcing penalties for violation of the regulations
• Completed February 20, 2009
3. A notification campaign directed at local and out-of-state boaters
• Initiated April 2009
4. A standardized watercraft tagging/seal system
• Implemented May 2009
5. A method to identify individual watercrafts (e.g., providing barcodes for all Colorado
registered watercrafts, utilizing a smart tag, or logging the registered Colorado license
(CL) number)
6. Development of a real-time database to be shared by all entities supervising watercraft
inspection and decontamination, including on-site computer capabilities for staff.
Possible watercraft inspection and decontamination Station Locations:
• CDOW and other state offices
• Visitors Centers
• High, Medium and Low Risk Waters
• Marinas
• Marine Dealers
• Private Industry Locations
14

�•

Highway Rest Stops

Watercraft Inspection and Decontamination Stations managed by CDOW in 2009:
• Denver CDOW Office
• Grand Junction CDOW Office
• Hot Sulphur Springs CDOW Office (established in 2008)
• Lamar CDOW Office
Proposed Watercraft Inspection and Decontamination Stations for future years:
• Antonito Visitors Center
• Burlington Visitors Center
• Colorado Springs CDOW &amp; State Parks Office
• Cortez Rest Stop
• Craig CDOW CWD Office
• Delta – Escalante SWA
• Dinosaur Visitors Center
• Fort Collins Visitors Center
• Limon Visitors Center
• Meeker CDOW Office
• Trinidad Visitors Center
• Trinidad – I25 Mile Marker 14 or 18 Rest Area
• Walden Highway Location
Out-of-state registered trailered watercraft owners will be notified prior to, or at, arrival in
Colorado of inspection requirements through a variety of informational outlets listed on page 2223. The watercraft will be inspected and decontaminated if necessary at a watercraft inspection
and decontamination stations, by state authorized agents. Upon successful inspection, watercraft
will be sealed to the trailer and the owners will be given a receipt authorizing launch in state
waters.

Prevention at High Risk Waters
This component details a preventative measure using watercraft inspection and decontamination
stations at high risk waters across the state. High risk waters are identified by the ongoing
collaborative risk assessment (page 8-9).
At multi-jurisdictional reservoirs it will take a partnership of the owner and managing entities to
plan and implement the site-specific programs. The majority of recreational water bodies in
Colorado are not owned or operated by the Divisions of DNR. CDOW is willing to coordinate
collaborative site-specific management plans for all high risk waters, however the
implementation of these plans rely heavily on the recreational manager to supervise the program
or contract with private industry for inspection services. These plans significantly reduce the
risk of contamination of uninfected waters. Inspections and decontaminations will be conducted
near boat ramp access. It is preferable that watercraft inspection and decontamination stations be
multi-purpose offering preventative inspections to those entering that specific water body, and
15

�inspections/decontaminations for out-of-state watercraft. This will provide a large network of
opportunities for boaters to minimize the risk of an introduction of ZQM and other ANS into
state waters.

16

�High Risk Waters Preventative Watercraft Inspection and Decontamination List
(Based on June 2008 risk assessment and pending management agreements. Subject to change.)

High Risk
Water

Owner

Recreation
Manager

25 State Parks

Various Owners

State Parks

Antero

Denver Water

Denver Water

Aurora Res

City of Aurora

Boulder Res

City of Boulder

City of Aurora
City of
Boulder
National Park
Service (NPS)
Larimer
County
U.S. Forest
Service

Blue Mesa
Carter Lake
Dillon Reservoir
Douglas Lake
Green Mountain
Horsetooth
Lake Nighthorse
McPhee
Prewitt
Quincy
Rampart
Sanchez
Stanley Lake
Taylor Park

Bureau of
Reclamation
Bureau of
Reclamation
Denver Water
North Poudre
Irrigation
Bureau of
Reclamation
Bureau of
Reclamation /
NCWCD
Bureau of
Reclamation
Bureau of
Reclamation
North Sterling
Irrigation
City of Aurora
Colorado Springs
Utilities
Sanchez Ditch &amp;
Irrigation Co.
City of
Westminster
Bureau of
Reclamation

Twin Lakes

Bureau of
Reclamation

Turquoise Lake

Bureau of
Reclamation

Vallecito

Pine River Irrig
District

Inspection and
Inspection and
2008
Decontamination Decontamination
Program
Paid for By
Supervised By
State Parks
Denver Water &amp;
CDOW
City of Aurora

State Parks

Yes

CDOW

Yes

City of Aurora

Yes

City of Boulder

City of Boulder

Yes

NPS &amp; CDOW

NPS

Yes

CDOW

Larimer County

No

Denver Water

Dillon and Frisco
Marina Operators

Yes

CDOW

CDOW

CDOW

No

U.S. Forest
Service

U.S. Forest Service

Heeney Marina

No

Larimer
County

CDOW

Larimer County

No

Unknown

Not Fully Built Yet

U.S. Forest
Service

CDOW

CDOW

No

CDOW

CDOW

CDOW

No

City of Aurora
U.S. Forest
Service

City of Aurora
Colorado Springs
Utilities &amp; CDOW

City of Aurora
CDOW

Yes

CDOW

CDOW

CDOW

No

City of
Westminster
U.S. Forest
Service
U.S. Forest
Service

City of
Westminster

City of
Westminster

Yes

CDOW

CDOW

No

Rocky Mountain
Recreation Co.

No

Rocky Mountain
Recreation Co.

No

Unknown

No

U.S. Forest
Service
Pine River
Irrig District

City of Aurora and
Colorado Springs
Utilities
City of Aurora and
Colorado Springs
Utilities
Unknown

No

Yes

17

�Williams Fork

Denver Water

Denver Water

Denver Water

CDOW

Yes

Inspections will be coordinated by CDOW on high risk waters that have multiple responsible
agencies and implemented as a partnership effort. Inspections will be conducted on high risk
State Wildlife Area waters by CDOW and on State Park waters by State Parks. Inspections will
be available seasonally based on the boating season and water temperature. Field operations will
be site-specific and will use the state standard procedures for watercraft inspection, seals and
decontamination. Inspection times and days of operations will be site-specific and will require
collaboration to plan and implement. Decontamination equipment will be available on site. The
implementation of collaborative site-specific zebra/quagga mussel management plans is
dependent on funding and available resources.

Roving Watercraft Inspection and Decontamination Patrol
It is not possible to have watercraft inspection and decontamination stations on every boat ramp
in the state. Therefore, Roving Watercraft Inspection and Decontamination Patrols will perform
watercraft inspection and decontamination randomly for medium and low risk waters that do not
have a permanent watercraft inspection and decontamination station.
A Roving Patrol will have a mobile watercraft inspection and decontamination unit that will set
up at different waters each day or several waters in one day, depending on proximity. This field
presence, personal education and random watercraft inspection effort will impress upon the
boating public the importance of watercraft inspection and decontamination and drive home the
“Expect to be Inspected” message. This will further strengthen the education campaign to
encourage boaters to always clean, drain, and dry. Roving Patrols will be modeled after the
fishing and hunting license programs and will impress upon boaters their responsibility for
preventing the movement of mussels to new waters. There should be specific regulations
establishing violations for trailered motorized watercraft that are not clean, drain and dry prior to
launching in Colorado waters. It is proposed to attach a point system to boating registrations,
similar to fishing, hunting and driving.
In 2009, there will be a total of 7 CDOW Roving Patrols. Three patrols will work in the SW
Region, while one patrol will work in each of the NE, NW, and SE Regions. There will also be a
single statewide patrol dedicated to quality assurance and field support. Every watercraft
inspection and decontamination station is subject to field evaluation by the quality control roving
patrol. Each patrol will consist of two temporary employees trained as stage II authorized
agents.
These roving crews will operate seasonally and at varied times for 6 months (May-October).
CDOW Area and District Wildlife Managers will provide law enforcement support for roving
crews and stations located at water bodies. This roving component provides a moderate level of
protection for waters or where such a station is not warranted based on the cost and an
assessment of risk. It also allows an educational component to educate watercraft owners that it
is their responsibility to keep their watercraft free of ANS, regardless of what water they are on.

18

�Watercraft Inspection and Decontamination Standards, Training,
Certification &amp; Quality Control
The overland spread of zebra and quagga mussels by recreational boaters must be controlled or
minimized to protect the waters of the state. The ANS Act specifies that only authorized agents
or qualified peace officers may conduct watercraft inspections and decontamination operations.
Thus, the goal of the training aspect of the program is to increase the number of authorized
agents at various locations around the state who are certified to conduct watercraft inspections
and decontaminations. The State of Colorado standard protocols for watercraft inspection and
decontamination should be implemented at all state waters, regardless of the managing entity or
land/water owner. Proper training and the consistent use of standard methods and procedures
ensures that watercraft inspections and decontamination effectively reduce the risk of spread.
Because watercraft recreationists travel throughout the state and region, it is critical that all
managers use the same protocols and watercraft owners have similar experiences at watercraft
inspection and decontamination stations.
CDOW and Parks have partnered with several non-profits to conduct watercraft inspection and
decontamination training annually since 2006. Colorado’s protocols are based on the widely
accepted Pacific Marine Fisheries Commission (PSMFC) standardized watercraft inspection and
decontamination training taught at Lake Mead. The Colorado ANS Watercraft Inspection
Handbook was published by CDOW in March 2009. The writing of this document was a
collaborative effort between CDOW and Parks, along with many partners in Colorado and other
states.
The program developed is a specific curriculum for water recreation managers that teach
managers zebra/quagga mussel biology, vectors of spread, invasion history and Colorado
specifics. It impresses upon managers the importance of watercraft inspection and
decontamination programs. The course takes them through the intricacies of inspecting various
types of watercrafts for mussels and procedures to decontaminate them. The program walks
inspectors through setting up a watercraft inspection and decontamination program, including
educational messages, tracking methods, tagging protocols, and so on.
Anyone conducting watercraft inspection and/or decontamination in Colorado is required by
regulation to attend the state certification course. All partner agencies, water recreation
managers, water providers, marina operators, marine dealers, angling and boating groups, etc. are
highly encouraged to have staff in attendance. The PSMFC training at Lake Mead inspection
and decontamination training is recommended, but does not replace or certify individuals to
perform inspections or decontaminations for ANS in Colorado.
CDOW and State Parks (Divisions) will conduct trainings, certifications and quality control
checks to administer and regulate watercraft inspection and decontamination procedures. Stage
III trainers will be individuals designated and approved by both Divisions as experts in the
biology, inspection and decontamination of ANS. Stage III trainers should be Level II certified
by PSMFC, although it is not mandatory. Stage III trainers must teach Stage II trainings. Stage
II trainings must be a minimum of 12 hours long, and must include:
19

�1.
2.
3.
4.
5.
6.
7.
8.
9.

Teaching and education methods;
Public education methods and messages;
Inspection procedures and hands on practice;
Decontamination procedures and hands on practice;
Procedures for tracking, reporting and collecting samples;
Proper application of watercraft inspection and decontamination seals;
Background biological information on listed ANS (impacts and identification);
Legal constraints; and
A written test.

Stage II trainers will be individuals who have been through Stage II training, have successfully
passed the written test, and are in good standing with the quality control checks. Stage II trainers
are permitted to conduct Stage I trainings. Stage II trainers are able to train Stage I inspectors in
both inspection and decontamination. Stage I trainings must be a minimum of eight hours long
for inspection with an additional 4 hours of coursework for optional decontamination
certification. Stage I trainings must include:
1. Public education methods and messages;
2. Inspection procedures and hands on practice;
3. Decontamination methods and hands on practice (if additional 4 hours);
4. Procedures for tracking, reporting and collecting samples;
5. Proper application of watercraft inspection and decontamination seals;
6. Background biological information of listed ANS (impacts and identification);
7. Legal constraints; and
8. A written test.
Individuals who have attended Stage I training and have successfully passed the written test will
be recognized by the Divisions as authorized agents. The CDOW roving quality control patrol
will conduct quality assurance checks at watercraft inspection and decontamination locations to
verify proper procedures are being utilized. If the patrol observes failures to use proper
watercraft inspection and decontamination procedures, then either a written warning notice will
be issued or they may decertify an authorized agent, a location or a level II trainer until they have
attended and passed the appropriate training again. If the patrol observes multiple failures
within a calendar year, then they may also decertify an agent, a location or a level II trainer for
that calendar year. Recertification may occur in the next calendar year after such individuals
attend and successfully pass the appropriate training.
Upon completion of the training, the student will be certified by the Divisions as a State
Watercraft Inspection and Decontamination Operator (a.k.a. authorized agent). They will be
assigned a unique identifying number. This will be logged in the shared database and will
further partnerships, enabling the acceptance of watercraft inspection and decontamination
programs across jurisdictional boundaries. This high level of certification and quality control
should enable a passed and properly documented inspection or decontamination by one agency
to be accepted by another agency.

20

�Legal Authority
While the ultimate success of the ZQM Plan requires the collaboration of all of the partners, the
statutory and regulatory authority for Aquatic Nuisance Species lies under the DNR umbrella in
both the Divisions of Wildlife and State Parks. The following chapter outlines the State of
Colorado ANS Act and CDOW aquatic animal health regulations.

State of Colorado ANS Act (SB08-226)
The ANS Act was passed by the legislature and signed by Governor Ritter in May 2008
(Appendix H). The Act defines ANS as exotic or nonnative aquatic wildlife or any plant species
that have been determined to pose a significant threat to the aquatic resources or water
infrastructure of the state. It makes it illegal to possess, import, export, ship, transport, release,
plant, place, or cause an ANS to be released. It provides authority to qualified state
commissioned peace officers to inspect, decontaminate and quarantine watercraft for ANS. It
also provides authority for authorized agents to inspect and decontaminate watercraft for ANS.
The Act determines that the 1st violation is a class 2 petty offense with a fine of $150. A 2nd
offense is a misdemeanor with a $1000 fine. For a 3rd and subsequent offenses, the violator
commits a class 2 misdemeanor and, upon conviction, shall be punished as provided in section
18-1.3-501 C.R.S. It created in the State Treasury an ANS Fund in both the CDOW and DPOR,
designating a first year budget of $3.9M for CDOW and $3.2M for State Parks, and an annual
budget of $2.7M for State Parks and $1.3M for CDOW. The Act allocated 7 Permanent FTE to
State Parks. The Act delegates the promulgation of rules to the Parks Board. Rules will be
presented to the Parks Board for adoption on February 20, 2009 (Appendix I). Rules presented
take approximately 45 days to take effect.

State ANS Regulations:
On February 20, 2009 the Parks Board adopted regulations regarding ANS, specifically
watercraft inspection and decontamination. The regulations require all trailered watercraft to be
inspected prior to leaving an infested water, or prior to entering any water of the state if coming
from out of state waters. These rules set the standards for watercraft inspection and
decontamination, certification, sampling and monitoring and reporting. They enable private
industries to assist the state with inspection and decontamination services. The rules also created
a new AIS list that targets species that can be transported on a boat overland. The animal species
listed are New Zealand mudsnail, zebra mussels, quagga mussels, rusty crayfish, and three
species of waterfleas. The plant species listed are African elodea, Brazilian egeria, Eurasian
watermilfoil, giant salvinia, hydrilla, parrotfeather, yellow floating heart and water hyacinth.

CDOW Aquatic Health Regulations:
The penalty for violation of CDOW regulations is a $50.00 fine and 1 point off fishing license.
•

Possession of Aquatic Wildlife Regulation (CRS Title 33, Colorado Wildlife
Regulations Chapter 0 General Provisions, Article VII, # 012)

21

�No live aquatic wildlife may be possessed except as authorized in regulations. CDOW
has authority over all vertebrate, crustacean, and molluscan wildlife. Importation,
transportation, possession, and release of species on a prohibited list can result in
particularly heavy fines. This does not apply to possession for aquarium use.
•

Possession of Aquatic Wildlife Regulation (CRS Title 33, Colorado Wildlife
Regulations Chapter 0 General Provisions, Article VII, # 013)
The release (stocking) of aquatic wildlife is carefully described by statute. Only certain
species of fishes can be stocked and only in certain defined areas. Release of all other
aquatic wildlife including vertebrates, crustaceans, and mollusks must be accompanied by
written permission from the Director of the CDOW.

•

Possession of Aquatic Wildlife Regulation (CRS Title 33, Colorado Wildlife
Regulations Chapter 0 General Provisions, Article VII, # 014)
No live aquatic animals may be imported into Colorado without an Aquatic Species
Importation License. No live fish may be imported, transported, transferred, or stocked in
Colorado without a current fish health certificate. Salmonid fishes must be certified free
of several regulated pathogens. Non-salmonid fishes are required to be inspected for
VHSV.

State Fish Hatchery Program
Preventing ANS Spread in Aquaculture Activities
Annually, the Colorado State Fish Hatchery system, which consists of 17 production or rearing
units, produces and stocks approximately 3,767,000 catchable and 16,531,000 subcatchable
coldwater fish (of which 9,198,000 are from wild-spawn operations), and 76,007,000 warmwater fish. This represents a substantial contribution to the fisheries in the state, but also
provides opportunities for dissemination of pathogens and aquatic nuisance species (ANS). With
the detection of zebra and quagga mussels in several water bodies in Colorado, proactive and
preventative methods have been instituted within the state hatchery system to prevent spread of
ANS through aquaculture activities, especially fish stocking and taking of wild spawn. These
methods are detailed in Appendix J.

ANS Technology/Tracking
It is essential that the various agencies collaborating on the ANS program be able to
communicate efficiently. There are several technological applications that can aid in this effort.

Watercraft Inspection Seals

22

�In 2008, various entities implemented an inspection green seal system (locking tags with wire) at
some reservoirs with watercraft inspection and decontamination programs. The seals are placed
on watercrafts, locking the watercrafts to the trailer. The seals can only be cut off, so when a
watercraft arrives at a reservoir with a seal, the inspector will know that it hasn’t been on any
other waters since it was inspected. This system is extremely useful for local boaters that use the
same reservoirs repeatedly. A disadvantage of the uncoordinated seal system being used in 2008
was that some agencies using seals weren’t accepting seals from other agencies, further
frustrating watercraft owners.
A standard GREEN seal system, coupled with the watercraft inspection and decontamination
certification and quality control program, should enable acceptance across jurisdictional
boundaries. The goal is to engage entities to utilize state watercraft inspection and
decontamination standards and participate in Colorado’s certification training. This will make
the process easier for watercraft inspection and decontamination staff from each entity and
boaters alike.
When a watercraft leaves a reservoir, a certified inspection will be performed and if necessary, a
decontamination, after which a seal can be placed on the watercraft certifying that the watercraft
is cleared to launch in any state water. The state standard is a single seal system. The seal color
is green and it will have a unique identifying number on it. (The number will be entered along
with the watercraft’s Colorado License (CL) number in the electronic database when that is
available.) Seals will be given with a receipt that documents the date, location, authorized agent
and procedure completed (inspection or decontamination) to warrant placing the seal.
The green seal attaching the watercraft to the trailer means that the watercraft has been inspected
by a state authorized agent and is able to launch on any body of water in the state. To get a green
seal, watercrafts must have no vegetation, no mud and no water, in addition to meeting the
following criteria.
Watercrafts will get a green seal if...
• the watercraft is from out of state and has undergone and passed an inspection and if
needed, decontamination, by a state authorized agent.
• the watercraft has left an infested body of water and has undergone and passed a high risk
inspection and if needed, decontamination, by a state authorized agent.
• the watercraft has left an uninfested body of water and has undergone and passed an
inspection and if needed, decontamination, by a state authorized agent.
No other colors of seals (only green) are endorsed by the state program and should be accepted
across jurisdictions.

Watercraft Inspection and Decontamination Tracking Database
The 2008 seal system performed a critical function and notified the inspector that the watercraft
had passed an inspection and what water it was last on. However, the 2008 watercraft inspection
and decontamination protocol involved a lot of paperwork in the field and did not enable
communication between watercraft inspection and decontamination inspectors and law
23

�enforcement personnel. A high priority of the ZQM Plan is the development of an electronic
database to be used by state authorized personnel at watercraft inspection and decontamination
stations.
When a watercraft undergoes an inspection, the inspector will type in the CL number (or scan a
barcode or smart tag) and see an up-to-date history of that watercraft’s interactions with other
watercraft inspection and decontamination stations. This database will contain information about
watercraft inspection and decontamination efforts and will enable one agency to see when a
watercraft was inspected or decontaminated at another agency’s waters. This effort will
compliment the current tagging system and will aid in acceptance of inspections across
jurisdictional boundaries.

Sampling and Monitoring Database
Another necessary technological component of the ZQM Plan is a web-based sampling and
monitoring database. The goal is to develop a database similar to the chronic wasting disease
(CWD) database, which will enable the sampling technicians, microscopist, FlowCAM operator,
laboratories and the program manager to save critical data from their step in the identification
process in the same database. There will also be “read only” access given to key staff. This will
enable CDOW to quickly respond to inquiries about sample status, promoting better
communication both internally and externally. The database will be an effective way to engage
partners to participate in the sampling program by providing them with the ability to track their
samples through the CDOW identification process. The database is under development and
scheduled for completion in spring 2011.

Communication and Information
The CDOW public relations office is the lead on zebra and quagga mussel communication and
information efforts. There has been an ongoing communications team established since January
2008, consisting of public information officers from DNR, CDOW, Parks, CWCB, Bureau of
Reclamation, U.S. Forest Service, Water Distributors and local governments.
The goals of the multi-agency communication team are to:
• Communicate information about zebra and quagga mussels in Colorado
• Serve as main liaison between ANS Programs and media contacts
• Develop press releases in collaboration with other agencies
• Coordinate press contacts, interviews and media events
• Develop informational materials such as brochures, rack cards, signs and billboards
• Educate the public about what they can do to minimize the spread and about new
regulations, laws, procedures
Future activities will include but are not limited to the following:
• Continue press release and media contacts responsibilities
24

�•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•

Continue presentations, educational media outlets, sportsmen’s tradeshows participation
Parks will send a letter to all registered boaters in Colorado in 2009 and 2010
Implement notification campaign to out of state boaters
Send a letter regarding new out of state boating regulations to registered boaters other
states, beginning with infested states and neighboring states.
Create a Colorado specific brochure about zebra/quagga mussels
Create a Colorado specific brochure about aquatic nuisance species
Maintain inventory and distribution of brochures and rack cards
Coordinate boat ramp sign orders and distribution for medium and low risk waters
Coordinate posting of approximately 30 billboards
Develop boilerplate letter to shoreline homeowners on infested waters
Investigate utilizing truck wraps on hatchery trucks driving around the state
Investigate utilizing truck wraps on semi trucks driving around the state
Investigate AM radio stations repeated “clean, drain, dry” message and notice of out of
state boater regulations, along with associated "tune to xxxx AM" signs on highways
Pursue getting articles in mainstream publications (e.g. 5280 Magazine)
Pursue information distribution through retail outlets
Expand ANS information on websites
Coordinate ALERT postcard to be included with water providers monthly bill to increase
outreach effort to a majority of the population versus only boaters and anglers. The alert
message will be included in mailing three times a year – May, July, September – to
correspond with high recreation season.

Education
Education truly is the most important aspect of the ANS Program. If every boater, angler and
professional aquatic worker practices Clean, Drain and Dry, there will be little ANS moving into
new waters. Not only is education critical for recreational user groups and the general public,
but also for internal staff, partners, legislators and stakeholders. Opportunities for internal
education are listed below:
1.
2.
3.
4.
5.
6.

The Annual ANS Workshop (5th year in 2009)
Various watercraft inspection and decontamination trainings statewide (16 in 2008)
ANS Newsletter to be sent out quarterly
A list serve for regular updates on program activities or news
Educational Program modeled after Bear Aware
SharePoint website

The Education Section of CDOW published the State ANS Watercraft Inspection Handbook in
March 2009 (Appendix K). The writing of this document was a collaborative effort between
CDOW and Parks, along with many partners in Colorado and other states. The target audience is
25

�all recreational managers of waters in Colorado. Those include municipalities, counties, state
agencies, federal agencies, marinas, private citizens and HOAs. It will read as a teaching
manual, detailing the ZQM problem and the importance of implementing the watercraft
inspection and decontamination programs. The manual will teach the standard protocols and the
intricacies of managing a watercraft inspection and decontamination program. This standard for
watercraft inspection and decontamination was adopted into regulation and is the state standard
for inspection and decontamination. It serves as the curriculum for the trainings, certification
and quality control program outlined earlier. It is posted online at www.colorado.gov/wildlife.
Zebra and quagga mussels and other ANS present a multi-generational problem because there
are currently no effective control methods for lakes and reservoirs. Therefore, it is critical that
we take the message to the classroom and teach the next generation the importance of preventing
invasive species from spreading to new habitats. The Education Section of CDOW is working to
develop a curriculum for science, math and geography teachers on Invasive Species, utilizing
zebra mussels as the “poster species”. CDOW presented the curriculum concept to Denver
School District 6th grade Geography teachers on October 25, 2008 and to the Colorado
Association of Science Teachers on November 21, 2008. K-12 educational materials will be
developed over summer and tested in the fall of 2010. CDOW will conduct trainings in the
spring for teachers. Once tested, the materials will be available in spring 2011.
A recommendation for the future is to develop a boater education program specific to ANS on
the CDOW and State Parks websites. Parks registers all boats in Colorado and should consider
incorporating this tool into the online registration process. A parallel online angler education
program can be created specific to ANS within CDOW.

Research
Although zebra and quagga mussels have been in the U.S. for over 20 years, and extensive
research has been conducted in the Eastern U.S., there are still many questions left unanswered.
It is apparent that the mussels are behaving much differently in the lower Colorado River than in
the Eastern U.S. There is an ongoing and critical need for applied research to aid in the
management of these highly adaptable invasive species in Colorado and the West.
An evolving list of potential research topics have been compiled for further analysis. It is the
goal of CDOW to conduct some research in house, cost share other larger scale projects with
partners and engage higher education involvement on others. The list below will continue to
evolve as items are completed and new opportunities arise. Prioritization for research will be
determined based upon resources, the expertise of the CDOW Aquatic Biology Staff and
opportunity for partnerships. Not all projects listed below will be initiated or completed in 2009.
Research will be ongoing over many years. Until we understand the mussels’ behavior in the
West and have viable cost-efficient control methods, there will be a consistent need for scientific
research.

26

�List of Priority Research Topics:
1. Economic analysis – detailed examination of costs associated with variety of
management strategies and how those may affect local economies, private industries and
state tourism revenue.
2. Veliger survivability in interior boat compartments, such as ballast tanks, live wells,
bladders, etc.
3. Use of KCl, chlorine or other control methods in interior boat compartments, such as
ballast tanks, live wells, bladders, etc., to kill veligers and adult mussels
4. Efficacy of currently used watercraft decontamination methods
5. Best Management Practices for fish management operations from infested waters or
hatcheries (e.g. wild spawn, egg transport, etc)
6. Modeling risk of overland transport through Colorado on recreational watercraft.
7. Modeling risk of downstream dispersal via the natural flow of water, specifically from
high altitude lakes and reservoirs (e.g. CB-T, Twin, Turquoise, etc)
8. Rate of spread from high elevation, high gradient, cold mountain rivers
9. Ability to survive and be transported through very large, high velocity water distribution
structures such as the Adams tunnel
10. Reproductive capabilities in high altitude lakes
11. Effects on native plankton populations
12. Effects on native western mussels populations
13. Control methods in open water systems

Volunteer Opportunities
There are numerous opportunities for volunteers to contribute. In 2005-2006, a volunteer work
force was created to survey, map and kill Eurasian watermilfoil. This work force was small, but
dedicated, and contributed a great deal about what we know to be the current status of Eurasian
watermilfoil in Colorado. It is an example of how extremely dedicated and productive
volunteers can be. Utilizing volunteers is an effective way to get a large volume of work done
with limited resources. However, volunteers do need to be supervised and managed by
permanent staff, which requires dedicated labor.
There are several opportunities for zebra/quagga mussel program volunteer involvement. Other
states have utilized volunteer scuba dive teams for ANS sampling and monitoring, as well as
control. Divers can conduct underwater surveys for adult mussels in infested waters and can
perform hand removal of adults to slow the rapid growth rate.
The watercraft inspection and decontamination program can be staffed with certified volunteers.
Volunteers would have to go through the Stage I training and maintain good status on quality
control checks, as do other authorized agents. There is a possibility of having Stage II trained
volunteers that can teach watercraft inspection and decontamination trainings and operate
stations.
Sampling and monitoring is also an area that volunteers can prove efficient. Volunteers can
expand the reaches and frequency of our sampling program by performing regular checks of
27

�substrate samplers. They can also perform shoreline surveys and sample for other ANS.
Opportunities also exist for volunteers to gather baseline data on native aquatic species.
Currently, there are several educational projects for volunteers to participate in. Projects include;
development of informational materials (i.e. brochures); distribution of educational materials at
lakes and reservoirs; staffing trade shows, expo booths and fishing tournaments; and classroom
presentations or teacher trainings.
Lastly, there are programmatic administrative needs that volunteers could accomplish. Tasks
would include basic office work such as compiling mailings, filing, data entry and meeting
organization.

Staffing Requirements
In order to effectively implement the ZQM Plan, at least 4 new permanent FTE are
recommended for the DOW Invasive Species Program. Currently the personnel requirements are
not in place to oversee the many facets of implementation. To accomplish the actions in the
ZQM Plan, a range of 100-150 temporary FTE are needed to conduct sampling and monitoring,
as well as operate watercraft inspection and decontamination stations. Those temporary
employees and activities need to be managed by permanent personnel.

Invasive Species Personnel:
•

•

4-8 New Permanent Full Time Invasive Species Biologists (WM III)
o Implement the State ZQM Plan
o Implement the State ANS Management Plan
o Oversee watercraft inspection and decontamination operations
 Containment at infested waters
 Prevention targeting out of state boaters
 Prevention at various lakes and reservoirs
 Roving Patrols
o Hire and supervise a minimum of 37 temporary FTE watercraft inspection and
decontamination staff
o Oversee watercraft inspection and decontamination training, certification and
quality control
o Coordinate sampling and monitoring staff
o Coordinate with site-specific management planning teams
o Coordinate volunteer projects
o Rapidly respond in a timely fashion to reports of new ANS sightings
o Responsible for distribution of ANS informational materials through Region
o Coordinate with AWM and DWM staff
o Consult and advise on terrestrial weed and exotic invasive insect issues
o Serve as support services for field techs regarding invasive species.
15 temporary full-time early detection sampling and monitoring technicians (6 month
temps to cover 10 month sampling window)

28

�•

135 temporary full-time watercraft inspection and decontamination inspectors (6
month temps)

Law Enforcement:
•

•
•

Utilize existing CDOW Area and District Wildlife Manager Staff
o Provide law enforcement at watercraft inspection and decontamination
stations
o Conduct ANS inspections while performing other duties, such as checking
fishing licenses and boating safety inspections
Engage participation from qualified peace officers, such as municipal or county
officers and federal partners
Enforcement Responsibilities
o Provide law enforcement support to watercraft inspection and
decontamination Stations, including roving patrol
o Conduct ANS Inspections and Decontaminations while performing routine
enforcement duties, such as checking fishing licenses or boater safety
o Provide ANS law enforcement procedural training and continuing
education
o Implement check stations at key locations that do not have watercraft
inspection and decontamination stations
o Coordinate with Invasive Species Program Staff and site-specific
management planning teams.
o Conduct investigations on ANS related matters

Summary of ZQM Plan Recommendations
Staffing Recommendations
1. Fund, hire and train 4-8 new permanent full-time Invasive Species Biologists
2. Fund, hire and train 12 temporary full-time for sampling and monitoring
3. Fund, hire and train approximately 135 temporary full-time for watercraft inspection and
decontamination

Early Detection Sampling and Monitoring Recommendations
1. Hire and train temporary full-time sampling and monitoring technicians.
a. Ten sampling and monitoring field technicians to conduct surveys and collect
samples for ZQM and other ANS statewide.
b. Two technicians to work at AAHL (log samples, perform microscopy, operate
FlowCAM, coordinate with labs, etc)
2. Purchase a FlowCAM identification tool for the AAHL.
a. Increase efficiency in processing by enabling AAHL staff to process more
samples much faster.
b. Provide scientific documentation on sample analysis by logging prescribed data
sets and photographing specimen.

29

�3.
4.

5.

6.

7.

8.

c. Aid with research efforts on effects of invasive mussels on plankton populations
by logging and categorizing all plankton in the sample.
Perform PCR at AAHL
Purchase or utilize existing equipment, where available, for temporary FTE field staff
a. Each team of sampling technicians should have their own watercraft to eliminate
need for aquatic staff to provide transportation to sampling sites on water.
i. Enable more efficient sampling by making technicians self sufficient.
b. Each sampling technician will need a vehicle that can trailer a watercraft.
c. They must have the ability to decontaminate the watercraft in between uses.
d. Five laptops
e. Five GPS units and Pathfinder Software
f. GIS capabilities
Implement a web-based real time database to track samples from the time they are taken
to the final DNA results.
a. Model after CWD
b. Enable the program supervisor, sampling technician, microscopist and
independent lab to all update data in the same system.
c. Provide up to the minute status reports on samples in various stages of the
detection and identification process.
d. Document all steps in the process for scientific analysis.
Utilize partners to increase number of waters sampled for zebra and quagga mussels
a. Federal agencies (e.g. USFS, BLM, NPS), municipal and county parks, water
providers and private reservoir managers are among the few entities that should
partner with CDOW to increase overall sampling range.
b. CDOW can distribute and train entities on sampling protocols.
c. Samples should be sent to the AAHL for analysis.
Encourage reporting of potential sightings to CDOW.
a. Continue to utilize 1-877-STOP-ANS
b. Utilize 1-303-293-6531for reporting and information distribution
c. Utilize ReportANS@state.co.us email address
d. Develop an internet based reporting system on CDOW website to easily allow
recreationists, partners and the public to quickly report a suspected ANS sighting
in CO.
Disinfect all equipment in between waters or between reaches of the same river.
a. Watercrafts, Trailers, Water Trucks, Barges and Large Equipment:
i. Removing all visible mud, plants, organisms and debris from watercrafts,
trailers and equipment
ii. Wash with a high pressure (250psi) hot water wash (minimum 140°F); or
intense scrubbing if high pressure is not available
iii. Drain all water and do not move water between waters, even from
different stretches of the same river
iv. Thorough and complete drying
b. Waders and Gear:
i. Immerse waders and gear in a solution of Sparquat 256 and clean water
(six ounces of Sparquat 256 per gallon of water) for fifteen minutes prior
to, and after, sampling.
30

�ii. This will also protect against moving and transplanting whirling disease or
New Zealand Mudsnail
c. Plankton Tow Equipment and Substrates:
i. Plankton tow equipment and substrates used in an infested water body
cannot be used in an uninfested water body.
ii. Soak plankton tow equipment and substrates in an approved disinfectant in
between each and every use.
d. Questions about equipment disinfection can be directed to the CDOW Aquatic
Animal Health Lab (122 E. Edison, Brush, CO 80723 - 970-842-6308).
9. Preserve samples properly
a. Preserve adults in 70% ethanol
b. Keep plankton tow samples alive, when possible, and store in refrigerator for max
3 days
c. If plankton tow samples must be preserved, store in 70% ethanol.
10. Ship samples properly
a. Ship samples to CDOW Aquatic Animal Health Lab (122 E. Edison, Brush, CO
80723 - 970-842-6308)
b. Samples must be accompanied by appropriate forms provided by CDOW and
adequately labeled.
c. Live plankton tow samples must be shipped cold overnight in leak-proof plastic
bottles.
d. Preserved adult specimen must be shipped in plastic containers preserved in
ethanol.
11. Identification
a. Plankton Tow
ii. Phase I – ocular identification with a microscope or FlowCAM
iii. Phase II – molecular identification with PCR
iv. Phase III – molecular identification with gene sequencing
1. One positive ID on all three phases is sufficient evidence to
identify positive waters
2. If only a single positive from any method is found, the water will
be declared “suspect” until tests confirm or refute the infestation
3. Once a water is identified positive, future DNA analysis may not
be required following positive microscopy results.
b. Adults
v. Phase I – ocular identification by more than 1 trained scientist
vi. Phase II – molecular identification with PCR
1. Molecular identification may or may not be required
12. Reporting
a. Telephone: 1-877-STOP-ANS or 1-303-293-6531
b. Email to ReportANS@state.co.us
c. Website: www.colorado.gov/wildlife.
d. Utilize appropriate forms from CDOW

31

�Prevention and Containment: Watercraft Inspection and Decontamination
1.
2.
3.
4.
5.
6.

Containment of Infested Waters
Prevention targeting watercraft coming from out of state
Prevention at high or medium risk waters
Roving watercraft inspection and decontamination Patrols
Watercraft Inspection Handbook, Certification and Quality Control program
Green Seal System

Technology
1. Electronic Watercraft Inspection and Decontamination Tracking Database
2. Early Detection Sampling and Monitoring web-based database

Communication and Information
1.
2.
3.
4.

Continue press release and media contacts responsibilities
Continue presentations, educational media outlets, sportsmen’s tradeshows participation
Parks send another letter to all registered boaters in state in 2009
Send a letter regarding new out of state boating regulations to registered boaters other
states, beginning with infested states and neighboring states.
5. Create a Colorado specific brochure about zebra/quagga mussels and all ANS
6. Maintain inventory and distribution of brochures and rack cards
7. Coordinate boat ramp sign orders and distribution for medium and low waters in 2009
8. Coordinate posting of approximately 30 billboards in 2009 with Marketing
9. Develop boilerplate letter to home owners on infested waters
10. Investigate utilizing truck wraps on hatchery trucks and semis driving around the state
11. Investigate AM radio stations repeated message, along with "tune to xx AM" signs
12. Pursue getting articles in mainstream publications (e.g. 5280 Magazine)
13. Pursue information distribution through retail outlets
14. Expand ANS information on websites
15. Coordinate ALERT postcard to be included with water providers monthly bill to increase
outreach effort to a majority of the population versus only boaters and anglers.

Education
1.
2.
3.
4.
5.
6.
7.
8.

Annual ANS Workshop (5th year in 2009)
Watercraft Inspection and Decontamination Handbook
Watercraft Inspection and Decontamination Trainings
Colorado Reader for Classrooms
Classroom curriculum
Website boater education program
Website angler education program
Expand CDOW invasive species website
32

�9. ANS Newsletter
10. A list serve for regular updates on program activities or news

Volunteer Opportunities
1.
2.
3.
4.
5.
6.

Scuba Divers
Watercraft Inspection and Decontamination Operators
Monitoring
Education
Administration
Sampling and Monitoring

Research
1. Economic analysis
2. Veliger survivability in interior boat compartments
3. Use of KCl, chlorine or other control methods in interior boat compartments to kill
veligers and adult mussels
4. Efficacy of currently used watercraft decontamination methods
5. Best Management Practices for fish management operations from infested waters or
hatcheries (e.g. wild spawn, egg transport, etc)
6. Modeling risk of overland transport through Colorado on recreational watercraft.
7. Modeling risk of downstream dispersal via the natural flow of water, specifically from
high altitude lakes and reservoirs
8. Rate of spread from high elevation, high gradient, cold mountain rivers
9. Ability to survive and be transported through very large, high velocity water distribution
structures such as the Adams tunnel
10. Reproductive capabilities in high altitude lakes
11. Effects on native plankton populations
12. Effects on native western mussel populations
13. Control methods in open water systems

33

�Acknowledgements
Many people have put in a great deal of time to help with the zebra/quagga mussel response in
Colorado. Those that contributed to this plan specifically are listed below:

Colorado Division of Wildlife Zebra/Quagga Mussel Management Team:
Anita Martinez, Aquatics NW Region
Bob Thompson, Law Enforcement Unit
Craig Workman, Engineering
Crystal Peterson, NE Region
Doug Krieger, Aquatics SE Region
Edward Frazar, Engineering
Elizabeth Brown, Invasive Species
Greg Gerlich, Aquatic Section
Holly Clifford, Financial
Jamie Anthony, Water
Jeff Rucks, Education
Jeff Ver Steeg, Assistant Director
Jerry Neal, Information
Ken Kehmeier, Aquatics NE Region

Lyle Sidener, NW Region
Mark Jones, Aquatic Research
Michelle Arnold, Contracts
Mike Japhet, Aquatics SW Region
Mike Trujillo, SE Region
Patt Dorsey, SW Region
Pat Miks, PBE
Rob Lloyd, Technologies
Reid DeWalt, NE Region
Scott Gilmore, Education
Sherman Hebein, Aquatics NW Region
Tom Nesler, Wildlife Conservation
Tom Remington, Director
Vicki Milano, Aquatic Animal Health Lab
Wendy Hanophy, Education

State Zebra/Quagga Mussel Task Force:
Brad Wind, Northern Water
Bud O’Hara, Pueblo Board Water Works
Carlie Ronca, Bureau of Reclamation
Chris Theel, CDPHE
Dan McAuliffe, CWCB
Dave Winters, USFS
Dick Wolfe, DWR
Doug Robotham, DNR
Eric Howell, Colorado Springs Utilities
Erin Williams, USFWS
Jay Thompson, BLM
Jennifer Gimbel, CWCB
Jim Walker, CDOT

Kent Vanroosendaal, Bureau of Reclamation
Kelly Uhing, CDA
Kirstie Nixon, Revenue
Linda Dreiss, NPS
Matt Malick, NPS
Neil Sperandeo, Denver Water
Rich Archer, Revenue
Rob Billerbeck, State Parks
Scott Cuthbertson, DWR
Scott Leach, CDA
Steve Wolf, DWR
Tom McClure, USFS
Tommy Phillips, CO Marine Dealers Assoc.

Colorado ANS Steering Committee:
Chris Theel, CDPHE
Curtis Hartenstine, Watershed Network
Chris Pague, TNC
Dave Nickum, Trout Unlimited
Denise Hosler, Bureau of Reclamation
Elizabeth Brown, CDOW
Greg Brunjak, Private

Kelly Cline, City of Westminster
Matt Malick, NPS
Myron Chase, NPS
Rick Mueller, City of Aurora
Scott Leach, CDA
Tina Proctor, USFWS
Vicki Milano, CDOW

34

�Literature Cited
Army Corp of Engineers Zebra Mussel Information System. Updated Version March 14, 2002.
http://el.erdc.usace.army.mil/zebra/zmis/
Army Corp of Engineers Zebra Mussel Chemical Control Guide. January 2000.
http://el.erdc.usace.army.mil/elpubs/pdf/trel00-1.pdf
Benson, A., and Raikow, D. Dreissena polymorpha. USGS Nonindigenous Aquatic Species Database,
Gainesville, FL. 2006. Revised: 4/24/2006 http://nas.er.usgs.gov/queries/FactSheet.asp?speciesID=5
Britton, David. Zebra Mussel (Dreissena polymorpha). ANS Taskforce Web site. 2006.
http://www.anstaskforce.gov/spoc/zebra_mussels.php
Bureau of Reclamation. No date. Collecting water samples for Dreissena ssp. veliger PCR analysis.
Bureau of Reclamation, Technical Service Center, Denver, CO.
State of California. 2007. California Rapid Response Plan for Zebra and Quagga Mussels.
Colorado ANS Steering Committee. 2008. Colorado Aquatic Nuisance Species Management Plan –
Draft. Denver, CO.
Colorado Division of Wildlife. 2008. Regulations. Denver, CO.
Colorado State Parks. 2008. Lake Pueblo Zebra Mussel Response Plan. Denver, CO
Claudi, Renata and Makie, Gerry L. 1994. Practical Manual for Zebra Mussel Monitoring and
CRC Press. ISBN 0873719859, 9780873719858

Control.

Culver, D.A., W.J. Edwards, and L. Babcock-Jackson. 2000. Preventing the introduction of zebra
mussels during aquaculture and fish stocking activities. Verhandlungen Internationale Vereinigung für
Limnologie 27:1809-1811.
Edwards, W.J., L. Babcock-Jackson, and D.A. Culver. 2002. Field testing of protocols to prevent the
spread of zebra mussels Dreissena polymorpha during fish hatchery and aquaculture activities. North
American Journal of Aquaculture 64:220-223.
Edwards, W.J., L. Babcock-Jackson, and D.A. Culver. 2000. Prevention of the spread of zebra mussels
during fish hatchery and aquaculture activities. North American Journal of Aquaculture 62:229-236.
Nalepa T.F. and Schloesser, DW. 1993. Zebra Mussels: Biology, Impacts and Control. CRC Press.
ISBN 0873716965, 9780873716963
O’Neill, Jr., C.R. 1997. Economic impact of zebra mussels -- Results of the 1995 National
Zebra Mussel Information Clearinghouse Study. New York Sea Grant Institute, NY.
Waller, D.L., S.W. Fisher, and H. Dabrowska. 1996. Prevention of zebra mussel infestation and
dispersal during aquaculture operations. The Progressive Fish Culturist 58:77-84.

35

�Appendices
A.
B.
C.
D.
E.
F.
G.
H.
I.
J.
K.
L.

M.
N.
O.
P.

Partners: Authorities and Responsibilities
Plankton Tow Sampling Protocol
Collection Protocol for watercraft inspection and decontamination Stations
Protocol for Preserving and Shipping Samples
Original Risk Assessment (June 23, 2008)
Sampling List 2007 and 2008
Notification of Positive Results Diagram
State of Colorado ANS Act (SB08-226)
State of Colorado ANS Regulations
State Fish Hatchery Program Methods
State ANS Watercraft Inspection Handbook
Zebra and Quagga Mussel Overview
a. Biology, life cycle, habitat requirements and vectors of spread
b. Dreissena mussel Impacts
c. Dreissena invasion history in USA and Colorado
State ANS Program Accomplishments (2004-2008)
Statewide ZQM Planning Team Structure: DOW and Mussel Task Force
Statewide ZQM Planning Team Concept, Goals and Objectives
ACOE References: Zebra Mussel Control Manual and Zebra Mussel Information System

36

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                    <text>COLORADO DIVISION OF WILDLIFE

ANS Tips for Boats with
Ballast Tanks
Some wakeboard boats, ski boats and sailboats have ballast
tanks which are filled with water to stabilize the boat and
allow them to ride lower in the water. Many ballast tanks
can’t be visually checked,
and many cannot be fully
drained. Even after these
tanks have been pumped
out, they can contain up to
two gallons of water. Even
a few gallons of water from
another reservoir could
contain thousands to
millions of microscopic
zebra or quagga
mussel larvae or
other Aquatic
Nuisance Species
(ANS)! The more
water that is
transported in
the bottom of
ballast tanks, the
higher the risk is
of introducing
zebra or quagga mussels to your favorite lake. Because of
the high costs and damage caused to boats, fish, dams and
water facilities by mussels we don’t want that to happen.

If the inspector finds water in a ballast tank or can’t verify
how much water remains in the tanks, the tanks may
require decontamination. Boats with more than two ballast
tanks will require decontamination. The only tool we
currently have to decontaminate enclosed ballast tanks is
to flush them out with very hot water that will kill any
mussels present. The problem is that there are numerous
models of boats with ballast tanks. Some require extremely
sophisticated and technical processes to get the hot water
in all the necessary places. Wakeboard boats are
particularly technical, difficult, and time consuming to
decontaminate. Also, some wakeboard boats may have
ballast tank pumps which are only rated for 130ºF water.
The standard for killing zebra mussels is 140 to 170ºF,
which is hotter than these pumps can tolerate. Boats with
these lower-temperature rated pumps will be difficult to
decontaminate and decontaminations may need to be
performed by a
certified dealer.

© DOW PHOTO, BY CINDY BRADY

© DOW PHOTOS, BY CINDY BRADY

What Can I Do to Make My
Ballast Tanks Safer?

© BRAD HENLEY

What’s the Big
Deal about Ballast Tanks?

Ballast Tank Standing Water

The Colorado Division of Wildlife is the state agency
responsible for protecting and managing wildlife and its
habitat, as well as providing wildlife-related recreation.
The Division is funded by hunting and fishing license
fees, federal grants and Colorado Lottery proceeds
through Great Outdoors Colorado.
4/2011 – 30,000

COLORADO DIVISION OF WILDLIFE • 6060 Broadway • Denver, CO 80216 • (303) 297-1192 • www.wildlife.state.co.us

�What are My Options for
Decontamination?
If any ANS is found on a boat during inspection, the inspection
staff cannot permit the boat to leave and will perform the
decontamination on site.
If no ANS is found there are two options available:
• Have the inspection staff decontaminate the boat for you.
• Take your boat to marine dealer that is certified in ANS
inspections. This is not as convenient, but is likely the best
course of action for wakeboard and other technically difficult
boats. There may be a charge by the dealers who provide this
service, but they have marine service specialists who know these
boats very well. After the boat is decontaminated, they can
apply a green seal between the boat and trailer
to document that it was decontaminated
properly. When returning to the lake, the
boat inspector will check to verify that
the seal and receipt are valid, and allow
the boat to launch.
The following locations are certified, have
green seals and can handle wakeboard or
other technical boats:
Best Marine Service
12098 W. 50th Place,
Wheat Ridge, CO 80033
(303) 423-3311
Nelson Motor Sports
5800 N. Federal
Denver, CO 80221
(303) 468-1369
Rocky Mountain Boat Co.
290 S. McCulloch Blvd.
Pueblo West, CO 81007
(719) 547-3100
Tommy's Slalom Shop
3740 N. Sheridan Blvd.
Denver, CO 80231
(303) 455-3091

Tips for Speedy and
Convenient Inspections and
Decontaminations
We are continually working on ways to improve the inspection
and decontamination process and we recommend these options:
• Replace any pumps rated to only 130ºF with pumps rated to
180ºF. The higher-heat rated pump will make it easier and less
risky to get your boat decontaminated at an inspection station.
Keep your receipt for the pump and your owner’s manual on
board to help inspectors at the next location.
• Get an inspection seal! Every time you boat or get your boat
serviced, request a green seal when leaving the water.
• Schedule inspections and decontaminations on a weekday.
You can get on the water faster by having a green seal prior to
entering the water. If you are likely to need a decontamination,
getting pre-inspected and decontaminated on a weekday may
be more convenient.
• Stop by the Colorado Division of Wildlife office in Denver or
Grand Junction Monday through Friday for a free professional
ANS inspection or decontamination. Check the website for
hours of operation or call (303) 291-7295 for more information.

You Can Make a Difference!
You can help stop the spread of Aquatic Nuisance Species (ANS)
in Colorado and the West! Before entering and when leaving any
waters always:
Clean: Remove all plants, animals and mud. Thoroughly wash
everything: boats, trailers, vehicle hitches and motors. Aquatic
plant fragments and animals can hide in mud and survive many
days out of water. Be sure to clean all fishing equipment including
waders and boots.
Drain: Completely drain every space or item that could hold
water, including live wells, bait containers, ballast and bilge tanks,
and engine cooling systems. Remove plugs, drop motor, and use
sponges and/or towels to absorb all water from bilges, live wells,
ballast tanks and motors.
Dry: Allow sufficient time for boats and equipment to dry
completely before launching in other waters.

ILLUSTRATIONS BY COLORADO STATE PARKS

Dispose: Properly dispose unused live bait into trash containers,
not into the water. Properly dispose of aquarium or classroom
animals or plants, do not place
them in any body of water or
natural setting.
For more information call the
Colorado Division of Wildlife
at (303) 291-7295.
Please Clean, Drain, and Dry
your boat to keep boating
open in Colorado.

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                    <text>Known Positive Waters for ANS in Colorado – January 2018
Definition from the ANS Act (SB08-226): "AQUATIC NUISANCE SPECIES" MEANS EXOTIC OR NONNATIVE AQUATIC
WILDLIFE OR ANY PLANT SPECIES THAT HAVE BEEN DETERMINED BY THE BOARD TO POSE A SIGNIFICANT THREAT TO
THE AQUATIC RESOURCES OR WATER INFRASTRUCTURE OF THE STATE.”
Animals:
Common Name

Scientific Name

Status in Colorado

Crayfish, rusty

Orconectes rusticus

Present in CO

Mussel, quagga
Mussel, zebra

New Zealand
mudsnail

Waterflea, spiny
Waterflea, fishhook

Dreissena
rostriformis bugensis
Dreissena
polymorpha

Potamopyrgus
antipodarum

Bythotrephes
cederstroemi
Cercopagis pengoi

Location in Colorado
Catamount Reservoir, Yampa River, Stagecoach Reservoir,
and Sanchez Reservoir

Present in CO

Green Mountain Reservoir (Suspect)

Not Present in CO

No known

Present in CO

Bear Canyon Creek, City of Boulder - Boulder Creek, Dry
Creek (2), Chatfield Reservoir, Dinosaur NM – Green River,
Gunnison River (East of Delta), Pike NF - South Platte River
below Eleven Mile Dam, Eleven Mile Reservoir State Park,
Spinney Mountain Reservoir State Park, Charlie Meyer State
Wildlife Area (Dream Stream), South Delaney Buttes
Reservoir and East Delaney Buttes Reservoir in Delaney
Buttes State Wildlife Area, College Lake at CSU Fort Collins,
Fountain Creek in Colorado Springs, Uncompahgre River,
4Mile Canyon Creek, Monument Lake

No verified presence

No Known

No verified presence

No Known

Location in Colorado
No Known
Jefferson Lake, NTP Ponds, Spinney Mountain
Adobe Creek SWA, Arvada Reservoir, Bear Canyon Creek,
Bessemer Ditch, Big Dry Creek, Blue Heron Ponds, Boulder
Creek, Brush Hollow, Chatfield Reservoir, CU Ponds in
Boulder, Bow Mar Lake, Bowles Reservoir, Brush Hollow
Reservoir, Charlie Meyer SWA, Douglas Reservoir, Eleven
Mile State Park, Gateway Reservoir (Private), Horseshoe and
Martin Reservoirs in Lathrop SP, Lake Minnequa, Lowell
Ponds, Marston Reservoir, Minnequa Canal (Fremont
Canal), Monument Lake, Navajo Reservoir(NM Side), North
Poudre Reservoir #4, Panama Reservoir #1, Pathfinder Park
Pond, Pavlakis Open Space, Pella Crossing Ponds, Prospect
Lake, Pueblo Reservoir, Pueblo Steel Mill, Rio Grande River,
Saint Charles Reservoir#2, #3, Saint Vrain Creek, Saint Vrain
State Ponds, Sawhill Ponds, Sheets Lake, Skaguay Reservoir,
South Platte River, Standley Lake (Westminster), Swift
Ponds, Tucker Lake, Tule Lakes, Walden Pond, Ward Road
Ponds, Wellington Reservoir #4, West Lake, West Prospect
Park Lake, Aurora Reservoir, Cherry Creek Reservoir, Lon
Hagler Reservoir

Plants:
Common Name
African elodea
Brazilian elodea

Scientific Name
Lagarosiphon major
Egeria densa

Status in Colorado
No verified presence
Present in CO

Eurasian watermilfoil

Myriophyllum
spicatum

Present in CO

Hybrid invasive
watermilfoil

Myriophyllum
spicatum x
Myriophyllum
sibiricum

Present in CO

Cigar Pond in Chatfield State Park, Cherry Creek Reservoir
State Park (near swim beach), Golden Pond in Longmont,
Saint Vrain State Park-Pelican

�Giant salvinia

Salvinia molesta

No current verified
presence

Hyacinth, water

Eichhornia crassipes

Present in CO

Hydrilla

Hydrilla verticillata
Myriophyllum
aquaticum
Nymphoides peltata

No verified presence

Alamosa (2006)
Centennial (detected and eradicated in 2010)
No Known

No verified presence

No Known

No verified presence

No Known

Parrotfeather
Yellow floating heart

No Known

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                    <text>State of Colorado
Containment Manual for
Watercraft Inspection and
Decontamination Stations
A supplement to the Official Watercraft Inspection and Decontamination Procedures

Updated – September 2013

�This project was funded by the U.S. Fish and Wildlife Service through the Quagga Zebra Action
Plan for Western Waters (QZAP) grant.
This document furthers the needs identified in QZAP Section B. Prevention:
• B.1. – Mandatory Watercraft Inspection and Decontamination at Infested Waters.
• B.2 – Continue the development of effective watercraft inspection and decontamination
protocols and standards.
Protocols in this document are consistent with the Uniform Minimum Protocols and Standards
for Watercraft Inspection and Decontamination for Dreissenid Mussels in the United States.

1

�TABLE OF CONTENTS
1. Purpose…………….………………………………………………………………………….…………….………………...4
2. Introduction……….………………………………………………………………………………………..…………….…5
3. Legal Basis………….…………………………………………………………………………..……………………….…….6
4. Monitoring………….…………………………………………………………………………..…………………………..10
a. Current status of zebra and quagga mussels in Colorado………….………………………10
5. Elements of a WID Containment Program…………………………………………………..……………...11
6. Education………………………………………………………………………………………………..……..…………..12
7. Watercraft Inspection and Decontamination (WID)…………………………………………………....14
a. Wire Seals and Receipts………………………………………………………………….…………..….15
b. Containment WID Procedures………………………………………………………….…….………19
i. Entrance Inspection Step By Step WID Procedure……………………….…….….22
ii. ZQM Veliger Containment………………………….……………………………………....25
iii. Exit Inspection Step By Step WID Procedure…………………………………..…….26
iv. Adult ZQM Containment……………………………………………………………………..31
v. Infested ZQM Containment ………………………………………………………….…….32
8. Maximizing risk reduction at infested waters when resources are inadequate to
implement containment WID procedures…………………..…………………………….……………….…33
a. The Bare Minimum…………………………………………………………………………..…….…….….33
b. Using Exposure Based Risk to Prioritize Watercraft Inspection and
Decontamination…………………………………………………………………….………………….…...34
c. Infested Waters Containment Spectrum…………………………………………………………..35
d. A Geographic Approach to Containing Multiple Waters in Close
Proximity………………………………………………………..……….………………………………..……..36
9. WID Containment Options for Other Species of ANS……………………….……………………....38
a. Eurasian Watermilfoil and Aquatic Weeds…………………………………………………….38
b. New Zealand Mudsnail…………………………………………………………………...................39
c. Rusty Crayfish……………………………………………………………………………………………....41
d. Waterfleas…………………………………………………………………………………………………....42
10. Conclusion………………………………………………………………………………………………………….…....43

�All photos credited to Colorado Parks and Wildlife staff unless otherwise noted.

3

�Purpose
The State of Colorado has implemented a partnership based, multi-jurisdictional, mandatory
watercraft inspection and decontamination program to prevent the spread of Aquatic Nuisance
Species (ANS). The purpose of the State of Colorado Containment Manual for Watercraft
Inspection and Decontamination Stations (Manual) is to provide standard containment
protocols across jurisdictions within Colorado, and potentially across the West. This Manual
details the watercraft inspection and decontamination
(WID) containment procedures to contain and prevent
the overland spread of aquatic nuisance species. These
procedures apply to all aquatic nuisance species, both
plant and animal, but are strongly focused on zebra and
quagga mussels (ZQM).
The Manual is an important piece of the broad statewide
Quagga mussel encrusted
engine being decontaminated
training and quality assurance program in place for ANS.
This manual provides direction for implementation of
containment protocols, as Colorado has done previously for prevention WID stations in the
2009 publication, Colorado Watercraft Inspection Handbook: Official WID Procedures. Since
that time, the state has also published the Colorado ANS Watercraft Decontamination Manual,
2011, and Colorado Boat Compendium for ANS Inspectors, 2012. The Containment Manual is
the final portion of the regulation referenced “Official WID Procedures” to be published. These
four documents combined will provide a comprehensive and consolidated Colorado WID
Procedures Curriculum and WID Trainer’s Guide in January 2014. In the past, other states have
utilized portions of Colorado’s previous publications. Therefore, it is anticipated that these
containment procedures may have broader implementation than in this state alone.
We realize the inherent difficulty in implementing a regionally consistent watercraft
containment program. Adding to the challenge is that numerous programs are already in place,
while others are in the early planning or implementation stages. In some instances, changes to
regulations at the local, state and possible federal level may be necessary to implement a
comprehensive multi-jurisdictional program. However, because each entity is unique; having
different missions, authority, resources, facilities and governing bodies, it is understood that
additional or stricter standards may be implemented and that cross-jurisdictional reciprocity
should be left to the discretion of the implementing agency/organization (UMPS, 2012).
This Manual documents the standard for WID containment that can be rapidly implemented
anywhere ANS is detected to prevent the spread overland on watercraft. Implementation of
these procedures is, of course, dependent on available resources.
4

�Introduction

Invasive species are a threat to the economy, natural resources, outdoor recreation,
agriculture, industry, water storage and transportation. Since the discovery of quagga mussels
in Lake Mead in 2007, and other aquatic nuisance species (ANS) in the west, ANS have become
a high priority for containment and prevention in western waterways.
ANS plants and animals threaten native species and interfere with municipal, commercial and
agricultural water supply and distribution, and recreational activities. In their native
environments, ANS populations are typically held in check and controlled by predators,
parasites, pathogens, and
competitors. However, when
they are transported to a new
environment, the natural checks
are usually left behind. This gives
invasive plants and animals an
advantage over native species
and makes them very difficult to
control.
It is generally accepted that
mussels cannot move overland
without some help (Padilla and
others, 1996; Kraft and Johnson,

Zebra Mussels at Cheney Lake, Kansas

2000). The catalyst for such
Prevention - To stop, or attempt to stop, the introduction of ANS.
movement is further
accepted and recognized as
Containment- To stop, or attempt to stop, ANS from spreading.
involving some form of
human intervention. This intervention can be in the form of water conveyance (canals,
channels, pipes, pumps, etc.), watercraft (various recreational and commercial types) and
associated boating equipment (ropes, anchors), direct and/or inadvertent movement of water
(e.g. with live bait), or fishing equipment (boots, clothing, gear). Each of these means of
transport requires a degree of human activity to provide a mechanism to connect an infested
water body to one that is not naturally “connected” (Giusti, 2011).
Since the confirmation of quagga and zebra mussels, and other ANS, in many reservoirs and
lakes throughout the west, prevention and containment protocols are mandatory in Colorado
to prevent the distribution of these harmful species.

5

�Legal Basis
The Colorado State Legislature passed the ANS Act (SB08-226) in response to the discovery of
quagga and zebra mussel veligers in several Colorado reservoirs in 2008. The legislative goal is
written as “…It is the intent of the General Assembly that prevention, containment and
eradication of aquatic nuisance species in the waters of the state in which such species have
been detected or are likely to be introduced shall be the Divisions (Parks and Wildlife)
HIGHEST PRIORITIES.”
The ANS Act provides authority to Qualified Peace Officers to inspect, and if necessary,
decontaminate or quarantine watercraft for ANS. It provides authority for CPW to certify
individuals as “Authorized Agents” (a.k.a. inspectors and decontaminators) to work at
“Authorized Locations” (a.k.a. watercraft inspection and decontamination stations or WIDS) for
the purposes of inspecting and possibly decontaminating watercraft to prevent new
introductions and contain existing detections of ANS.
The Parks Board (now Parks and Wildlife Commission) passed regulations required by the Act
on February 20, 2009. The ANS Law (SB08-226) and Regulations (Parks-8-801) prohibit the
possession and transportation of zebra or quagga mussels, or other listed ANS.
#801 – POSSESSIONS OF AQUATIC NUISANCE SPECIES
A. Except as provided in these regulations or authorized by the Divisions or under Title 33 or
Title 35 C.R.S., it shall be unlawful for any person to possess, import, export, ship,
transport, release, place, plant, or cause to be released, placed, or planted into the waters
of the state any aquatic nuisance species.
D. It is unlawful for any person to, or to attempt to, launch onto, operate on or remove from
any water of the state or vessel staging area any vessel or other floating device if they know
the vessel or other floating device contains any aquatic nuisance species.
The ANS regulations require mandatory watercraft inspection and decontamination, if
necessary, of:
• watercraft coming in from out of state
• watercraft leaving a containment water body in Colorado
• watercraft entering a high-risk water where inspections and decontaminations are
required by the owner or a managing entity
#803B: All persons transporting a vessel or other floating device from a water of the state
known to be infested as determined in regulation #806D, must be inspected prior to leaving
the infested water, or if state authorized inspection facilities are not open or otherwise
unavailable, must be inspected prior to launch in any other water of the state.

6

�The ANS Regulations also set the standard for training and certification, watercraft inspection,
decontamination, impoundment, sampling, monitoring, identification and reporting.
Authorized Agents at Containment Waters in Colorado are required to implement this WID
Containment Manual Procedure.
#802A - The Divisions may certify private inspectors and/or decontaminators. Such
persons shall not be authorized to stop, detain, impound a vessel or other floating
device, or order a vessel or other floating device decontaminated or quarantined. Such
persons, once certified, are only authorized to provide inspections and/or
decontaminations in accordance with WID procedures to persons transporting vessel or
other floating device who voluntarily request their services.
#802B - Authorized agents shall be certified by the Divisions prior to providing any
inspection or decontamination services.
#802C - Prior to providing any inspection and/or decontamination services, authorized
agents and private inspectors and/or decontaminators must successfully complete the
Divisions’ training course, must maintain active certification and must comply with all
quality assurance requirements as listed herein.
#803A - Inspections may be conducted by:
1. Any qualified peace officer;
2. Any authorized agent or private inspector and/or decontaminator who has been
properly trained as required by the Divisions, who holds a valid, active certification
and who is in good standing with the Divisions’ quality assurance checks.
It is imperative that inspectors and
decontaminations also strive to
prevent or contain introductions of
all invasives by ensuring watercraft
are clean, drained and dry – no mud,
no mussels, no water and no plants –
before launching and after retrieval in
Colorado waters.
Quagga mussels at Lake Pleasant, AZ
While this document puts special
emphasis on preventing introductions of two
species that have the most significant economic, cultural and natural resource impacts, zebra
and quagga mussels, or ZQM, the procedures apply to all aquatic nuisance species, both plant
and animal.

7

�#800.A.1 - Aquatic nuisance species means exotic or nonnative aquatic wildlife or any plant
species that have been determined by the board to pose a significant threat to the aquatic
resources or water infrastructure of the state, including, but not limited to, the following:
Animals:
Common Name
Crayfish, rusty
Mussel, quagga
Mussel, zebra
New Zealand mudsnail (NZMS)
Waterflea
Waterflea, fishhook
Waterflea, spiny

Plants:
Common Name
African elodea
Brazilian elodea
Eurasian watermilfoil
Giant salvinia
Hyacinth, water
Hydrilla
Parrotfeather
Yellow floating heart

Scientific Name
Orconectes rusticus
Dreissena bugensis
Dreissena polymorpha
Potamopyrgus antipodarum
Daphnia lumholtzii
Cercopagis pengoi
Bythotrephes longimanus (also known as
Bythotrephes cederstroemi)

Scientific Name
Lagarosiphon major
Egeria densa
Myriophyllum spicatum
Salvinia molesta
Eichornia crassipes
Hydrilla verticillata
Myriophyllum aquaticum
Nymphoides peltata

Wildlife Chapter 0 Regulations also define prohibited aquatic species and contain a list of
prohibited fish, animals and pathogens, which includes the animal
species listed above. The Colorado ANS Pocket Guide [CO
Division of Wildlife and Colorado Department of Agriculture,
2010] provides a comprehensive list and description of ANS that
could negatively impact native species, recreation, or water
resources. Additional information about zebra and quagga
mussels, New Zealand mudsnails and other native and nonnative mollusks can be found in the Colorado Mollusk Pocket
Guide [CO Division of Wildlife, 2011].
NZMS on a rock in
Eleven Mile Canyon
8

�Regulation #806D: To initially identify waters infested with aquatic nuisance species, the
following standards will be applied before notifying the public of the existence of these aquatic
nuisance species:
1. Zebra and Quagga mussel veligers. A multi-phase testing process involving both visual
and molecular identification methods will be completed in accordance with the procedural
checklist “Multi-Phase Identification of Zebra/Quagga Veligers” available from the
Divisions.
2. Zebra and Quagga mussel adults or New Zealand mudsnails.
Concurring identification by two or more mollusk identification experts.
3. Rusty crayfish.
Concurring identification by two or more crustacean identification experts.
4. Waterfleas.
Concurring identification by two or more plankton identification experts.
5. Aquatic nuisance species plants.
Concurring identification by two or more aquatic botanical experts.
The following water body definitions identify water bodies based on early detection sampling
methodology:
• Negative - sampling is ongoing and nothing has been detected, or nothing has been
detected within the time frames for de-listing.
• Inconclusive – Temporary status for a water body has not met the minimum criteria for
detection.
• Suspect – Water body that has met the minimum criteria for detection (regulation #806D-1).
o In Colorado, suspect waters must implement containment WID procedures.
• Positive – Multiple (2 or more) subsequent sampling events that meet the minimum
criteria for detection.
o In Colorado, positive waters must implement containment WID procedures.
• Infested – A water body that has an
established (recruiting or
reproducing) population of ANS.
o There are currently no
infested waters in
Colorado.

Right: Zebra mussel infestation at
El Dorado Reservoir, Kansas
9

�Monitoring
Monitoring is an integral part of any ANS program. The State of Colorado Sampling and
Monitoring Aquatic Nuisance Species Protocol Manual (2013) contains detailed protocols for
monitoring waters for invasive mussels and other ANS.
CPW prioritized waters for monitoring based on a statewide risk assessment that specifically
evaluated the risk of introduction of ZQM. The risk assessment identified 168 total public lakes
and reservoirs divided into 19 very high risk waters, 17 high risk waters, 58 medium risk waters,
and 64 low risk waters. The frequency and quantity of annual sampling is risk dependent. CPW
monitors streams and rivers on a rotating basis annually by need and priority.
The state follows a three-tier sampling protocol and a three-phase identification process for the
early detection of zebra or quagga mussels: 1) conducting plankton tows to detect veligers, 2)
check substrates to detect “settlers” or adults and 3) conduct surveys along the shoreline and
existing structures for settled juveniles or attached adult mussels. Identification of plankton
tows includes a cross-polarized light microscopic visual analysis, followed by two-phase DNA
analysis (polymerase chain reaction [PCR] and gene sequencing) for verification.
Verification of ANS in a water body will trigger an increase in the frequency of sampling events
and the quantity of sampling sites within the water body. Enhancements to the state’s
monitoring program for suspect and positive waters include volunteer monitoring and SCUBA.
Current Status of Zebra and Quagga Mussels in Colorado
Pueblo Reservoir, Granby Reservoir, Grand
Lake, Shadow Mountain Reservoir, Willow
Creek Reservoir, Tarryall Reservoir and Jumbo
Reservoir all tested positive for microscopic
juvenile zebra and/or quagga mussel veligers in
2008. Since that time there have been no new
positive waters listed. Subsequent testing
identified veligers in Pueblo Reservoir in 2009
and 2011.
In April 2009, Blue Mesa Reservoir began implementing containment procedures due to quagga
mussel DNA detection. U.S. Bureau of Reclamation samples from 2011 and 2012 also indicated
that quagga mussel DNA was present in Blue Mesa.
10

�Elements of a WID Containment Program
Following the detection of ANS, rapid response is essential to contain the invasive species and
prevent its spread to other waters. This Manual focuses on containing the overland spread of
ANS hitchhiking on trailered watercraft through the implementation of WID procedures. It
does not discuss other response topics, such as evaluation of potential control methods,
communications or research.
The elements of a containment program are education, watercraft inspection and
decontamination, and enforcement
“The best method of protection against an invasive mussel introduction is through
preventative measures. Prevention is much less expensive than containment or control
efforts. Although containment at infested waters is the top priority, CDOW [CPW]
recommends that focus be placed on prevention through field watercraft inspection and
decontamination, in conjunction with education and information efforts.”
State of Colorado Zebra and Quagga Mussel Management Plan, 2008
The scale at which these elements are implemented is entirely dependent on the resources
available to the state and contributing partners.
“Due to the multi-jurisdictional nature of Colorado waters, the ZQM Plan
recommendations apply to all partners; for no single entity is responsible for, or
capable of, implementing all of the necessary actions needed to protect Colorado
waters from invasive mussels or other ANS.”
State of Colorado Zebra and Quagga Mussel Management Plan, 2008
The greatest variability with respect to implementation of the containment WID procedures is
in relation to not only the resources allocated for containment, but also the ability of managers
to control access and traffic, in addition to the volume and complexity of watercraft.
“…the ability of containment reservoirs to implement the following protocol is
completely dependent on the number of boats at that specific time along with the
number of inspection and decontamination points and the complexity of watercraft. As
the number of complex boats increase, the ability of the Authorized Location to perform
high risk inspections and standing water decontaminations decrease. Therefore, it
stands to reason that more boats will get inspected and decontaminated on slower
weekdays than on busy weekends – or at smaller reservoirs versus larger reservoirs – or
at reservoirs with more ramps than those with less ramps. Prevention waters need to be
on high alert for watercraft that have previously been boating in containment waters
and have not been decontaminated.”
Official Colorado WID Procedures, 2012
11

�Education!
Education!
Education!
Education is the most
important part of any
ANS Program. There will
never be enough money
to have inspectors at all waters at all times. Therefore, it is
imperative that we engage boaters and educate them so they will inspect and drain their boat
after each and every use. If boaters, anglers and professionals clean, drain and dry their boats
and gear, we can stop the spread of ANS!
A bare minimum containment response is for managers to post signage at all suspect, positive
and infested (containment) waters and educate users to clean, drain and dry. It is important to
emphasize standard messaging and social awareness to help prevent the spread of ANS.
Success of containment and prevention programs depend largely on the cooperation and
understanding of the public. There are many outlets that can be utilized in order to spread
awareness about ANS including, but not limited to: kiosks, physical signs, highway billboards,
radio spots, one-on-one communication, interpretive programs, brochures, and “brand”
recognition (e.g. Stop Aquatic Hitchhikers and Clean, Drain, Dry).
A communication strategy should be developed as part of response planning for a verified
detection of ANS. The following are a few
elements that should be included:
•
•

Professional notification of the detection
and response strategy
Public notification of the detection and
management options being implemented
o Press release (media - newspapers,
television, radio, magazines, etc.)
o Signs must be posted at boat ramps,
entrance stations and foot access
points alerting the public that ANS
are present and what they must do
to avoid spreading the ANS to new
waters.
12

�•
•
•
•
•

Website information
Fact sheets for agency customer service representatives to answer questions
Rack cards, handouts or brochures with more detailed information for specific water
bodies or specific user groups (e.g. boaters, shoreline homeowners, etc)
Outreach to local businesses whose customers frequent the containment water body
(e.g. marine dealers, marine service centers, angling shops, etc.)
Outreach to local sporting groups that frequent the containment water body (e.g.
fishing clubs, ski clubs, sailing clubs, homeowners associations, etc.)

For containment programs, informational items should include the following:
• ANS name and biology
• Description of the ANS impacts to the resource and to specific user groups
• Direction on species identification and reporting sightings
• Information on how people can prevent the spread of ANS
• Requirements for users after recreating in containment waters
• Management changes as a result of the presence of ANS
Having consistent messaging across jurisdictions is also important to avoid confusing the public
and to help streamline inspection and containment programs. A containment program cannot
be successful without a strong educational campaign to inform the public and change attitudes
and behaviors. Research has shown that people are more likely to respond in a desirable way if
they understand how their actions affect the resource rather than emphasizing regulations or
fines (Wallace, 1990). While this is most often the case, it is important to have the cooperation
and support from local law enforcement in the rare instance that a boater is uncooperative or it
becomes necessary to impound a boat.

13

�Watercraft Inspection and Decontamination
The Goal for Every Boat:
• Clean, Drain, Dry in between each and every use!
• No Water. No Plants. No Mud. No Mussels.
What are the priorities of a watercraft inspector?
1.
Ensure Personal and Public Safety
Your safety and the safety of the public is the inspector’s top priority at all times. Many
vehicles and boats will be moving around the inspection area. People will be looking under
wheels and through the watercraft. All efforts must be made to ensure safety of all involved.
2.
Educate Boaters
Every contact made with boaters educates them about the importance of controlling zebra and
quagga mussels and other ANS. Boaters must realize that ANS are spread by their actions (or
inaction). They must understand that they have a lot to lose, in terms of access and
recreational opportunities, if they do not help in this effort. The primary education message is
Clean/Drain/Dry:
Clean―Remove all plants, animals, and mud. Thoroughly wash everything.
Drain―Drain every space or item that can hold water.
Dry―Make sure your watercraft is completely dry before leaving which means
sponging, toweling or pumping all water out.
3.
Inspecting Watercraft - Assessing the Risk of the Watercraft
By following the inspection procedure detailed later in this section and in the WID Procedures,
inspectors are ensuring that the biological risk of the watercraft is reduced prior to launch and
after exiting positive waters. Green seals and receipts help inspectors identify watercraft risk
much easier and faster.
4.
Draining standing water.
Colorado’s WID procedures are largely based on mitigating the risks associated with organisms
that get transported from one water body to another in standing water. These organisms (e.g.
mussel veligers, pathogens or plant fragments) are typically microscopic so it is of the utmost
importance that standing water be drained in between each and every use.
5.
Decontamination.
If there is a known ANS or suspect ANS on a watercraft, or standing water that cannot be
drained, sponged, pumped or toweled out, it must be decontaminated. See Decon Manual.

14

�SEAL AND RECEIPT
The first step in the entrance inspection procedure is to check for a seal and verify the receipt.
The last step in the exit inspection procedure for both prevention and containment reservoirs is
to apply a seal and receipt. Therefore, it is critically important to fully understand the seal and
receipt system. State of Colorado WID Procedures is to seal and provide receipts to all
trailered, motorized watercraft exiting a containment water body.
What is the inspection wire seal system?
Colorado uses a wire seal, coupled with a receipt, to communicate the location of the boat’s
last inspection or decontamination and associated information to the next inspector. The seal
is green but the color is essentially irrelevant. The seal locks the watercraft to the trailer
indicating to the last inspector it has not launched since the seal was issued. The receipt
accompanies the seal and provides documentation regarding date of last inspection, protocol
used, type of decontamination, if any and other important information.
Boats will get a green wire seal if…
A. The watercraft leaves a containment reservoir (suspect or positive) and passes either a highrisk inspection or a decontamination. Ballast tanks intending to go to a different location next
must be flushed.
NOTE: Containment reservoirs will use a BLUE seal receipt to provide a visual
notification to the next inspector indicating that the watercraft is coming from
positive/suspect waters.
B. The watercraft leaves a prevention reservoir (negative) and passes an Exit Inspection or a
decontamination.
C. The watercraft comes to an office or business WIDS and passes either an inspection or
decontamination.
NOTE: It is critical to attach the seal in
a way that it will be broken if the
watercraft is separated from the
trailer. Typically, the wire seal goes
between the eyebolt and hard, welded
part of the winch. Be advised that
some winches can be unrolled
completely and separated from the
seal without breaking.

15

�SEAL RECEIPTS
Seals are only valid with a matching receipt. The seal tells you that the watercraft has not
launched since its last inspection. The receipt is very important because it tells you, the
inspector, what kind of inspection and/or decontamination was performed at the last site, in
addition to when it was performed. This information will tell you what level of inspection or
decontamination, if any, is necessary prior to launch.
PREVENTION WATERS WHITE SEAL RECEIPT:

16

�CONTAINMENT RESERVOIRS BLUE RECEIPT
The receipt for positive and suspect waters is a different color to provide a visual cue and alert
inspectors at prevention waters, business locations, or other state’s roadside stations that this
boat was last in a containment water body. It also includes an indicator as to whether or not
the boater intended to return to the issuing location and instructions for the inspector.

17

�SEAL AND RECEIPT REMOVAL WID PROCEDURE AT CONTAINMENT LOCATIONS
A. If one of the following scenarios is true, the protocol is to verify the receipt, ask
about live aquatic bait, thank the boater and allow launch.
•
•
•

Watercraft is returning to the same lake/reservoir
Watercraft has been out of the water more than 30 days
Watercraft has been decontaminated for standing water

B. If the watercraft is from a different containment location and was not out of the
water for more than 30 days AND was not decontaminated for standing water:
•

Inspect for standing water
o Ask the boater to pull the bilge or drain plug and lower motor/engine,
and inspect the interior compartments.
 If there is water, decontaminate the motor or compartments with
any standing water remaining in them.
 If there is no water, cut off the seal, ask about live bait, thank the
boater and allow them to launch.

C. If the watercraft was fully decontaminated because it was an infested mussel boat:
•
•

Perform a high risk inspection
Perform a full decontaminate if any mussels are found

D. If the watercraft is from a prevention location, verify the watercraft is drained, ask
about live aquatic bait, thank the boater and allow launch.
Seals and Receipts Explained to the Public:
• Green does NOT mean go!
• A green seal is proof of prior inspection.
• It will speed up entry to the next water.
• You still have to stop at the inspection station and have the seal and receipt verified.
• You will be allowed to launch if you are returning to the same location, been out of the
water for more than 30 days or the watercraft is clean and dry.
• If you are not returning to the same location or the boat has not been out of the water
for more than 30 days, you may get a quick check prior to launching.
• If the watercraft is not clean and dry, you will most likely get re-inspected.
• Keep your watercraft clean and dry and get on the water faster!

18

�WID CONTAINMENT PROTOCOLS and STANDARD PROCEDURES
It is important to note that slightly different procedures are necessary for containment of
different types of ANS, and different life stages, as well as the degree of infestation at any
particular body of water. The current procedures enacted at Colorado’s Authorized Locations
for containment focus on stopping the spread of standing water that could potentially transport
veligers. This is because adult zebra or quagga mussels have never been found in Colorado.
The goal is to perform a high risk inspection on all trailered and motorized watercraft, and
to issue a green seal and receipt to all boats exiting the lake or reservoir. The protocol
places focus for inspection and decontamination on watercraft not intending to return to
the same location, and watercraft that cannot be drained.
Rules about WIDS at Colorado Containment Waters:
1. Watercraft entering must be inspected – prevention procedures.
The primary purpose of performing entrance inspections at positive or suspect waters is to
stop the continued inoculation of the known invasive species into the reservoir, and to
prevent new invasive species from being introduced.
Entrance inspection procedures are detailed in the Official Colorado Watercraft Inspection
and Decontamination Procedures: Certified Curriculum for Authorized Agents, 2013. There
is minimal information about entrance inspections in this document. Please refer to the
WID Curriculum for the complete entrance inspection protocols.

2. Watercraft exiting must be inspected – this is mandatory in Colorado!
Watercraft must get a Standing Water Decontamination if they have features that cannot
be drained (e.g. ballast, I/O, Inboard) and intend to launch somewhere different next.
Watercraft with suspect or known ANS must get a Full Decontamination (e.g. adult zebra or
quagga mussels).

Decontamination Protocols that must be followed by Authorized Agents are detailed in the
Colorado Watercraft Decontamination Manual, 2012. These procedures are not repeated
in this document. Please refer to the Decontamination Manual for complete
decontamination protocols.

19

�The following is a list of 2013 Containment Authorized Locations in Colorado:
• Blue Mesa Reservoir - QM
• Grand Lake - ZQM
• Granby Reservoir - QM
• Jumbo Reservoir SWA - QM
• Pueblo State Park - ZQM
• Shadow Mountain Reservoir - QM
• Tarryall Reservoir SWA – QM
• Lathrop State Park – EWM
• Eleven Mile State Park – EWM and NZMS
• Spinney Mountain State Park – NZMS
• Standley Lake - EWM
NOTE: Not all locations positive for EWM or NZMS are implementing containment procedures or
have watercraft inspection and decontamination stations.
There are limiting factors that may inhibit the ability to implement containment procedures:
1. Ability to control access and direct watercraft to inspection stations through controlled
launch and retrieval points at the water body, and effective traffic management
(e.g. elimination of shoreline launching, enacting night ramp closures, or traffic patterns
that allow retrieval or exiting the water without passing through inspection station)
2. Providing adequate staff and supervision
3. Providing enough water for decontaminations
4. Providing enough fuel (unleaded gas/diesel/propane) for decontaminations
5. Providing the adequate number of decontamination units
6. Providing for waste water containment or disposal, as required
7. Providing for safe traffic management
8. Providing a staging area for boats
Important Notes about Containment Locations:
1. If a boater claimed to be returning to a containment water body and does not, the
prevention water body they visit next must decontaminate the boat if they have a
ballast tank, an I/O, an Inboard or ANY standing water.
2. There are rare occasions when the weather is unsafe for inspectors to be working (e.g.
lightening and hail). During these times boaters can leave containment reservoirs
without inspection, draining or decontamination. It is imperative that these boats are
intercepted and drained or decontaminated before launching at the next reservoir.
20

�3. There are containment waters in which the access is not controlled. For example, the
containment waters within the Arapahoe National Recreation Area (Granby Reservoir,
Shadow Mountain Reservoir and Grand Lake) have no ramp closures in place at night
when inspectors are not present. Boaters can also launch in the spring before
inspectors start (if ice comes off early) and they can launch in the fall after inspections
close for the season (if ice comes on late). This is not an ideal situation and it is
preferred to have full access control at containment waters. It is the boater’s
responsibility to clean, drain, dry their watercraft AND get their watercraft inspected
before they launch again if they are leaving a containment water body when inspectors
are not present. Inspection and possibly decontamination of these watercraft prior to
launching at the next water body is imperative.

Shadow Mountain Reservoir
Photo by Cindi Frank

21

�STEP BY STEP ENTRANCE INSPECTION WID PROCEDURE
All stations regardless of status (positive, suspect or negative) perform entrance inspections for
trailered and motorized watercraft before launching onto the lake or reservoir.
Step 1 - Ensure personal and public safety - You must ask the driver to turn off the engine, put
on the parking brake and step out of the vehicle.
Step 2 – Greet and Educate the Boater
• Introduce yourself
• Provide a brief verbal explanation of the purpose of inspection
• Provide the boater with a brochure or educational item
• Mention the words Clean, Drain, Dry
Step 3 - Initial Assessment
• Record on the Activity Log or in the Data Collector the following information
o In or Out
o Boat Type
o Boat Registration Number
o Trailer License Plate
• Check for a Green WID Seal and Receipt - If present, record data on Activity Log or Data
Collectors and follow seal protocol as previously described.
Step 4 – Determining Risk Factors
1. Has the boat launched out of state in the last 30 days? If yes, where?
2. Where has the boat launched in state in the last 30 days?
• Listen carefully and pay attention if any of the locations are positive, suspect or
infested.
3. Visually check the watercraft’s exterior to determine if it is “dirty, crusty or slimy”
4. Identify if the watercraft is a complex vessel (defined in Curriculum as a watercraft that
has one or more compartments, or a closed hull, or more than one motor or engine)
5. Visually and physically inspect the watercraft to determine if there is any standing water
present.
IMPORTANT: If 2 or more of the above 5 risk factors are true (checkboxes on the log or data
collector), and then the watercraft must get a High Risk Inspection.
Step 5 – Check for Ballast Tanks
1. If the watercraft has no seal and receipt, the tanks should get a standing water
decontamination after inspection is completed before allowing launch.
2. If the watercraft has a seal and valid receipt, and was decontaminated  thank the
boater and allow launch.

22

�3. If the watercraft has a seal and valid receipt, and was not decontaminated, and is from a
prevention reservoir, have the boater run the ballast pumps and get as much water out
as possible  thank the boater and allow launch.
4. If the watercraft has a seal and valid receipt from less than 30 days ago and was not
decontaminated, and is from a containment reservoir  complete a high-risk inspection
and perform a standing water decontamination on ballast tanks. (same is true for I/O
and Inboards from containment waters)
Step 6 – Ask About Live Aquatic Bait
• Ask boaters if they have live aquatic bait.
a. If yes, follow bait protocol in the Curriculum Chapter 6.
b. If no, continue with inspection
Step 7 – Perform the visual and tactile entrance inspection of the watercraft, using the acronym
H.E.A.D. to ensure that the watercraft is properly inspected.
Hull and Trailer – Rapid Exterior Inspection
1. Look over (visual) and feel (tactile) the entire watercraft on both sides of hull and trailer.
2. Physically inspect the through hull fittings.
3. Check trailer bunks or rollers, tire wells, lights and electrical.
4. Remove any plants or plant fragments that are present.
5. Ask the boater to remove the bilge plug when inspecting the transom. Feel the bilge
area with and use a flashlight to visually see if any ANS are present.
6. If applicable, have the boater activate the bilge pump.
7. If the watercraft has an inboard engine, be certain to inspect the prop, prop shaft and
rudder.
Engine or Motor
1. Ask for the outboard or I/O to
be lowered
2. Visually and physically inspect
the engine with a flashlight
3. Visually and physically inspect
the gimbal area of the
outboard or I/O with a
flashlight
4. Carefully check the transom or
rear of the boat
Anchor and Equipment Checked
1. Ask to see the anchor and anchor rope or chain.
2. Visually and physically inspect the anchor and rope or chain for mud, plants and/or ANS.
3. Check any additional equipment such as life vests, buoys, paddles, ropes, nets, etc.
4. Ensure all equipment is clean and dry.
23

�Drain and Check Interior Compartments
For larger watercraft, you will need to get into the watercraft to inspect interior compartments
that could hold standing water (e.g. wells). For smaller watercraft, you may be able to see
without entering the watercraft.
1. Ask permission to board the watercraft and ask the boater to climb in first. Follow the
boater into the watercraft in the same way they entered. Be careful to prevent either
the boater(s) or inspection staff from falling or getting hurt.
2. Ask the boater to open up compartments so you can see all bait wells, live wells,
equipment lockers and verifiable ballast tanks.
a. If the watercraft has standing water in the bait well or in any container, the
inspector should work with the boater to remove standing water from the
watercraft using a pump, sponge, or towel. If the watercraft cannot be drained,
it should get a standing water decontamination.
b. Ensure that the compartments are fully drained prior to launch.
3. If the watercraft has an inboard engine, be sure to inspect the engine compartment and
bilge.
Step 8 - Closeout
1. Remind the boater to replace the bilge plug. The boater is responsible to ensure the
watercraft is watertight before launching.
2. Ask the boater to raise the engine or motor to ensure no damage to the motor takes
place.
3. Ensure all inspectors are finished looking at the watercraft and that nothing was found.
4. Yell “stand clear” to ensure the safety of staff and the public.
5. Remind the boater to get an exit inspection with a green seal and receipt on the way out
to make the inspection process quicker the next time around.
6. Thank the boater for keeping their boat Clean, Drain, and Dry and allow them to launch.
7. Complete the WID Activity Log or submit the Data Collector record.

24

�ZQM VELIGER CONTAINMENT
The goal of Colorado’s containment WID procedure is to prevent the spread of water in which
invasive mussel veligers have been positively identified to other waters. This is challenging
because there are many ways water can be transported in a vessel including: raw water
systems, outboard motors, inboard/outboard (I/O) and inboard engines, engine compartments,
storage compartments, equipment and gear that has had contact with water, bilge areas,
ballast tanks, live wells, bait wells, and any other areas that may potentially hold water. These
areas must both be drained and dried with sponges and towels, or get a standing water
decontamination. Resources are prioritized on trailered, motorized watercraft (specifically
those that cannot be drained) and watercraft that are not returning so the same location. If at
any point ANS are suspected or confirmed on watercraft, a full decontamination is required.

Where is the boat going to be
launched next?

Back to the
SAME water

I Don’t Know OR
A Different Water

High Risk
Inspection

High Risk
Inspection

Drain as well
as possible

Standing Water
Decontamination

Green Seal &amp;
Blue Receipt

Green Seal &amp;
Blue Receipt
25

�STEP BY STEP EXIT INSPECTION WID PROCEDURE AT CONTAINMENT LOCATIONS
Exit Inspections are mandatory at Colorado’s positive and suspect waters, and is important to
make an additional educational contact with the boater reinforcing that watercraft should be
clean, drain and dry in between each use. It also verifies that the boater has followed the
proper procedures to clean off the watercraft and completely drain all compartments prior to
leaving. Lastly, it is required to obtain a seal and receipt.
Repeat the primary educational message Clean/Drain/Dry and explain why boaters need to do
it each time they use their watercraft. Remind the boater of the negative impacts of zebra and
quagga mussels and other ANS.
Step 1 - Ensure personal and public safety
• You must ask the driver to turn off the engine, put on the parking brake and step out of
the vehicle.
NOTE: Consider putting chocks under the wheels of the vehicle and the trailer. The inspector
will have to climb on the watercraft and under the trailer, so it is important to prevent
watercraft or trailer from rolling.
Step 2 – Greet and Educate the Boater
• Introduce yourself
• Provide a brief verbal explanation of the purpose of the inspection
• Mention the words Clean, Drain, Dry
Step 3 - Initial Assessment
• Record on the Activity Log the following information
o “O” for Out/Exiting
o Boat Type (use key)
o Boat Registration Number
o Trailer License Plate
Step 4 – Ask About Live Aquatic Bait
• Ask boaters if they have live aquatic bait.
o If yes, recommend the boater properly dispose of bait in the trash or follow bait
protocol in Chapter 6.
o If no, continue with inspection
Step 5 - Ask the boater WHERE DO THEY PLAN TO LAUNCH THE BOAT NEXT?
o If returning to the same location – perform a high risk exit inspection.
o If not planning to return – perform a high risk exit inspection and follow
standing water decontamination procedures.

26

�Step 6 – Check for Ballast Tanks
• If the boater is going to launch at the same location next, the protocol is to have the
boater run the ballast pump(s) as long as it takes until no more water comes out of the
ballast tank(s).
• If the boater is planning to launch at a DIFFERENT location next, the ballast tanks must
get a standing water decontamination.
Step 7 – Perform the visual and tactile inspection of the watercraft, using the acronym HEAD
to ensure that all high risk portions of the watercraft are inspected.
Hull and Trailer – Exterior Inspection
• Look over the entire watercraft on both sides of hull and trailer.
• Physically inspect the through hull fittings.
• Check the trailer bunks or rollers, tire wells, lights and electrical.
• Remove any plants or plant fragments that are present.
• Ask the boater to remove the bilge plug when inspecting the transom. If applicable,
have the boater activate the bilge pump.
• If the watercraft has an inboard engine, be certain to inspect the prop, prop shaft and
rudder.
Engine or Motor
• Ask for the outboard or I/O to be lowered twice.
• Check engine compartments with a flashlight.
• Check the gimbal area of the outboard or I/O with a flashlight.
• Carefully check the transom or rear of the watercraft.
Anchor and Equipment Checked
• Ask to see the anchor and anchor rope or chain.
• Visually and physically inspect the anchor and rope/chain for mud, plants and/or ANS.
• Check any additional equipment such as life vests, buoys, paddles, ropes, nets, etc.
• Ensure all equipment is clean and dry.
Drain and Check Interior Compartments
For larger craft, you will need to get into the watercraft to inspect interior compartments that
could hold standing water (e.g. wells). For smaller craft, you may be able to see without
entering the watercraft.
• Ask for permission to board the watercraft and ask the boater to climb in first. Follow
the boater into the watercraft in the same way they entered. Be careful to prevent
either the boater(s) or inspection staff from falling or getting hurt.
• Ask the boater to open up compartments so you can see all bait wells, live wells,
equipment lockers and verifiable ballast tanks. The inspector should work with the
boater to remove standing water from the watercraft using a pump, sponge, or towel.
Ensure that the compartments are fully drained to the best of your ability.
27

�•

If the watercraft has an inboard engine, be sure to inspect the engine compartment and
its bilge and run bilge pump, if applicable.

NOTE: If the watercraft cannot be drained, and is not planning to return, it must get a
standing water decontamination.
Step 8 – Apply Seal and Provide Valid BLUE Receipt
• Properly apply a green seal to watercraft and trailer
• Hand the boater a copy of the green seal receipt and blue receipt
• Explain that the seal is valid only if the receipt is present and the seal is intact
Step 9 - Closeout
• Ask boater to leave the bilge plug out during transport to ensure extra drain/dry time
• Ask boater to raise the engine or motor to ensure no damage takes place
• Ensure all inspectors are finished looking at the watercraft and that nothing was found
• Thank the boater and remind them the importance of Clean, Drain, and Dry
Step 10 - Complete the WID Activity Log or submit the Data Collector record

28

�Exiting watercraft at containment reservoirs gets a minimum of a High Risk Inspection upon
exit. A high-risk inspection should be a thorough and complete visual and tactile inspection of
all portions of the watercraft, trailer, and any of the equipment or gear, ropes, or anchors. The
time it will take to complete a High Risk Inspection may vary greatly depending on the type and
complexity of the watercraft.
•
•
•
•

Feel the entire hull, trailer and transom below the water line focusing on right angles
and fasteners.
Be extremely thorough with engine/motor and gimbal inspection using a flashlight and
your hands.
Inspect all equipment that is exposed to water in interior compartments.
Ensure all water is drained (if returning) or perform a standing water decontamination
(if not returning).

If sandpapery bumps, mussels, or other suspect ANS are detected on the watercraft, a full
decontamination is required.

29

�WID RULES FOR STANDING WATER
Microscopic zebra and quagga mussel veligers are capable of surviving up to 27 days in closed
wet interior compartments (Myrick, 2012). It cannot be overstated how important it is that
standing water be drained from watercraft to prevent the movement of microscopic mussel
larvae or veligers, plant fragments, diseases and other animals from being transported. You
must pay careful attention to all trailered watercraft that cannot be completely drained and
therefore, contain standing water.
There are two types of water on watercraft:
Verifiable Water – This is water in compartments that you can see, feel or visually
inspect, such as in wells or bilges. This is most of the water on most on the watercrafts
you will encounter.
Unverifiable Water – This is water in compartments (e.g. ballast tanks) that you cannot
see, feel or visually inspect.
Rule #1 –Watercraft from Containment Reservoirs that have NOT been decontaminated
If the watercraft has been in suspect, positive or infested waters in the last 30 days
and has any standing water, it is mandatory to send the watercraft to
decontamination.
Even in cases where watercraft has an engine (I/O or Inboard) or a ballast tank that
cannot be drained completely, it is mandatory to send the watercraft to
decontamination and thoroughly flush those compartments.
Rule #2 – Watercraft with Verifiable Water
Incoming watercraft that is not green sealed and from unknown sources, or from
prevention waters must be clean, drained and dry. Sponge, pump or towel out standing
water, or decontaminate, prior to allowing launch.
Rule #3 – Watercraft with Unverifiable Water
Sealed boats with receipts returning to the same location do not need decontamination.
Sealed ballast boats with receipts moving between Colorado prevention locations must
be fully pumped out and do not require decontamination in between launches.
Undocumented boats (no green seal and receipt) will get a mandatory standing water
decontamination (I/O, Inboard, Ballast).
30

�ADULT ZQM CONTAINMNENT
While there has never been an adult zebra or quagga mussel found in a Colorado water body, it
is imperative that procedures are developed in the event rapid response is necessary in the
future. In other states where ZQM positive or infested waters exist, it is critical for the
protection of all waters, facilities and people in the West, that adult mussels do not leave
attached to watercraft.
Inspectors working at waters where adult mussel(s) have been detected must follow the same
Step-By-Step Exit Inspection Procedures for containment as veliger-detected waters. This will
prevent watercraft from transporting veligers in standing water, in addition to ensuring settlers
and adult mussels do not leave attached to watercraft.
Remember, the ANS Law (SB08-226) and Regulations (Parks-8-801) prohibits the possession
and transportation of zebra or quagga mussels, or other listed ANS. Therefore, it is a core
value within Colorado’s WID Program that watercraft with suspected or known ZQM or ANS
must get a full decontamination.
#801 – POSSESSIONS OF AQUATIC NUISANCE SPECIES
Except as provided in these regulations or authorized by the Divisions or under Title 33 or
Title 35 C.R.S., it shall be unlawful for any person to possess, import, export, ship,
transport, release, place, plant, or cause to be released, placed, or planted into the waters
of the state any aquatic nuisance species.
If a water body is positive for adult
mussels, but there is no confirmation
of an established population, it is
plausible that there will be very few,
if any, watercraft exiting with adult
mussels attached initially. The WID
procedures for veliger containment
will continue to be operationally
feasible. As the invasive population
advances, there will eventually be an
increase in watercraft exiting with
Quagga mussels at Lake Pleasant, AZ
adult mussels attached needing a full
decontamination. Decontaminating watercraft for adult mussels is much more expensive,
difficult and labor intensive, than flushing standing water out of watercraft to stop the
transportation of veligers.
31

�INFESTED ZQM CONTAINMENT
Infested bodies of water are those in which a zebra or quagga mussel population is established.
The invasive mussel population has multiple age classes, is reproducing and recruiting. Mussels
may be visible at the water body. Mussels have been observed attached to boats.
Containment at infested waters is the most difficult, costly and imperfect of all containment
scenarios. As populations of ZQM advance and explode, the demands of the containment WID
station increases exponentially. Operational feasibility and fiscal resources will have ultimate
influence over the ability to implement WID procedures at infested water bodies.
The volume of infested boats that will need a full decontamination will increase over time. WID
stations must be prepared to perform a full decontamination on a large percentage of complex
watercraft leaving the water body. Traffic flow, staffing volume, decontamination equipment,
wastewater containment and all other operational facets will have to be bolstered in order to
implement WID procedures.
Implementing Containment WID Procedures means performing a high risk inspection on
every trailered, motorized watercraft entering and exiting, and perform a standing water
decontamination on those that can’t be drained, and performing a full decontaminations for
those that have adult mussels or other ANS attached.
Difficulty implementing WID procedures occurs when the volume of complex watercraft,
compounded with adult mussel attachment, exceeds the operational and fiscal capacities of a
WID station. Stations at waterbodies with a lower volume of watercraft use, and low risk
simpler watercraft, are able to inspect and decontaminate more boats on exit than those WID
stations at waterbodies with high volume watercraft use and high risk complex watercraft.
Waterbodies with developed infrastructure and existing utilities also have a greater capacity to
mitigate limitations for inspection and decontamination than rustic stations.
Establishing public-private partnerships is very important when implementing any WIDS!
• Marine dealers, service centers and marinas offer an unparallelled connection to
educate and inform boaters.
• Marinas are often the recipient of commercially hauled watercraft and they offer
opportunities for complex watercraft to remain on the water for long periods.
• Infested mussel boats often need to be serviced by a trained marine mechanic.
Watercraft with infested interior compartments and engines may need service by a
professional to restore functionality.

32

�MAXIMIZING RISK REDUCTION AT INFESTED WATERS WHEN RESOURCES
ARE INADEQUATE TO IMPLEMENT CONTAINMENT WID PROCEDURES
When fiscal resources are not adequate to implement containment WID procedures at infested
waters, it is imperative to mitigate the potential for watercraft to move adult mussels to
negative waters to the greatest extent possible.
THE BARE MINIMUM
The minimum management response to a verified ANS detection is to install signage at suspect,
positive or infested waters to alert users and educate them to clean, drain and dry. Managers
should utilize existing agency personnel to inform boaters to take extra precautions to clean
and drain their watercraft after boating in infested waters.
Boater education becomes even more critical when resources to implement WID procedures
are inadequate at infested waters. Engaging watercraft owners to voluntarily self-inspect
and/or self-quarantine to stop the spread of ANS to new waters is top priority.
Managers can also mandate boaters self-inspect and/or self-quarantine (utilize a drying time)
their watercraft after boating in containment waters. It is very difficult to maintain quality and
enforce this approach, but it does provide minimal risk reduction because some boaters will
comply once educated.

Drying Time
The following are the dry times depending on the temperature as determined by the Western
Regional Panel (WRP) on the 100th Meridian Quarantine Time Estimator
(http://100thmeridian.org/emersion.asp).
Maximum daily temperature (Fahrenheit)
Minimum days out of water
&lt;30
3
30-40
28
40-60
30
60-80
14
80-100
7
&gt;100
3
NOTE: Add 7 days for temps ranging from 30-100 degrees F if relative humidity exceeds 50%.

33

�USING EXPOSURE BASED RISK TO PRIORITIZE WATERCRAFT INSPECTION AND
DECONTAMINATION
At highly infested water bodies that experience a very high volume of complex watercraft use,
resources may be inadequate to implement WID Procedures due to the large amount of
complex watercraft needing full decontamination.
The Colorado WID procedures for veliger and adult ZQM containment already account for
minimal levels of risk acceptance by allowing returning boaters to leave and return to the same
place without decontamination, and exempting hand-launched watercraft from inspection.
To achieve minimal to moderate risk reduction, managers should consider implementing WID
procedures on the highest risk watercraft. This approach prioritizes exit inspections and
decontaminations on those with the greatest exposure to the infestation (e.g. length of time on
the water body).
On the following page, there is a spectrum of containment options for consideration at infested
WID locations. The intent of the Infested Waters Containment Spectrum is to provide
prioritized options to implement containment WID procedures at infested sites with limited
resources. It has been documented that watercraft that has a longer exposure to mussels are
at a higher risk of transporting adult mussels. Watercraft that have been moored on the water
pose a greater risk than those that have not.
•

The spectrum begins at the bare minimum response, which requires almost no
resources being allocated to education, self-inspection and self-drying time.
• At the lowest resource levels, WID Procedures are implemented on only the highest
priority watercraft based on exposure – those on the water more than 7 days, more
than 3 days or overnight.
• To provide greater containment efficacy, staff should inspect all trailered and motorized
watercraft on exit, including day use customers. This is the Colorado WID Procedure.
• The ideal and most costly option is to inspect all watercraft coming and going with no
exceptions.
As resources become available, and new partnerships formed, implementation can expand
from the minimum to the ideal.

34

�Infested Waters WID Containment Spectrum

Minimum
$

Education

Self-Inspection

$$

WID Highest
Risk Boats

WID Highest
Risk Boats

$$$

WID Highest
Risk Boats

Exit Trailered
and Motorized

$$$$

$$$$$
Maximum
Ideal

All Trailered
and Motorized

• Post Signage Alerting Public
• Educate Users to Clean, Drain, Dry
• Implement Mandatory or Voluntary Self-Inspection
• Implement Mandatory or Voluntary Drying Time
• Mandatory Inspections for Watercraft Moored 7 days or longer.
Follow Containment Exit WID Procedure.
• Mandatory Inspections for Watercraft Moored 3 days or longer.
Follow Containment Exit WID Procedure.
• Mandatory Inspections for Watercraft Moored overnight or
longer. Follow Containment Exit WID Procedure.
• Mandatory Inspections for all trailered or motorized watercraft
exiting. Follow Containment Exit WID Procedure.
• Mandatory Inspections for all trailered or motorized watercraft
entering and exiting. Follow WID Procedures.

Exit All Boats

• Mandatory Inspections for all watercraft exiting, including handlaunch. Follow Containment Exit WID Procedure.

WID All Boats

• Mandatory Inspections for all watercraft entering and exiting,
including hand-launch. Follow WID Procedures.

35

�A GEOGRAPHIC APPROACH TO CONTAINING MULTIPLE WATERS IN CLOSE PROXIMITY
Scale is an important consideration when implementing containment measures, especially for
highly infested water bodies in close proximity or with a high percentage of shared users. In
some cases where there is only one infested water body in a given geographic area, the best
place to implement the containment program is right at that water access points (e.g. Pueblo
Reservoir State Park). In other cases, implementing a roadside containment system to reduce
the number of contaminated watercraft leaving a group of containment water bodies may be a
more efficient approach.
The 100th Meridian Initiative was founded on the principal of creating a broad geographic
boundary to contain zebra and quagga mussels to (east of the meridian) and prevent their
introduction to (west of the meridian) through education. A similar approach using WID
locations could be implemented to create a multi-state geographic boundary to protect
negative waters from eastern and southwestern infested waters. Standard training, procedures
and quality control measures would need to be enacted as well.
Shifting resources from water body access points (e.g. ramps) to outside infestation boundaries
(e.g. roadside stations) may be a more cost-effective method of implementing WID procedures
for containment within areas that have multiple positive or infested water bodies within close
proximity to each other. This approach would require a multi-jurisdictional partnership and
law enforcement commitment to implement. A benefit would be that boaters could move
between the infested waters without consuming WID resources, but would be required to
submit to inspection and decontamination when moving towards negative waters.
Similarly, many very large reservoirs cross jurisdictional boundaries including private, city,
county, state, tribal, and federal agencies. Some of these also have private boat launches, in
addition to shoreline launching sites. In these instances, setting up boat inspection and
decontamination checkpoints at roadside points may provide for better containment.
The containment reservoirs for veligers in Grand County, Colorado might be a candidate for a
shift to this approach in the future (see map on the next page). Capital construction would
need to take place to build the roadside stations, and there would have to be commitment
from law enforcement personnel to staff the stations alongside inspectors. However, this shift
would allow managers to operate two highway checkpoints, instead of the current system of
operating stations at five public ramps and two closed public ramps. A secondary benefit is that
the public could regain full access to the closed portions of the four reservoirs.

36

�Closed Boat Ramps

37

�OTHER ANS CONTAINMENT
EURASIAN WATERMILFOIL (EWM) &amp; AQUATIC WEEDS

Eurasian Watermilfoil (EWM) is an aquatic noxious weed that is present in Eastern Colorado
and neighboring states. Removing plants from the trailer or watercraft is a part of every
entrance and exit inspection. Plants should not be transported on watercraft or conveyances.
EWM and many other aquatic plants spread by fragments, seeds and winter buds. These
aquatic weeds usually form dense mats that restrict swimming, fishing, and boating, and clot
water intakes. They alter water chemistry by choking and shading out other native aquatic
plants. The decaying plants decrease oxygen levels in the water and foul lakeside beaches. This
disrupts the food chain and destroys habitat and food needed by fish and birds. They create
standing water in ditches and canals, providing ideal mosquito habitat leading to an increase in
mosquito borne illnesses, such as West Nile Virus.
WID Procedures for EWM Containment:
•

High risk exit inspection focusing on the exterior of the
boat including trailer bunks, propellers, intakes and
any other areas where aquatic plants may be stuck or
attached. All plant material must be physically
removed.

•

If plant fragments cannot be physically removed,
perform a plant decontamination.

38

�OTHER ANS CONTAINMENT –
NEW ZEALAND MUDSNAILS (NZMS)
Watercraft inspectors have detected NZMS on
boats moving into and out of Colorado’s
reservoirs!
Mudsnails are able to close their shells to
withstand dry conditions and a variety of
temperatures. If embedded in mud, they can
survive 30 days in dry mud and 50 days in moist
mud.
They can reproduce asexually; it only takes one to
start an entirely new population. As with ZQM,
eradicating established infestations is impossible.
By following Colorado WID Procedures [no mud,
no plants, no water, and no mussels] the
movement of New Zealand mudsnails on
watercraft can be stopped by following the WID
procedures, and educating anglers. If boaters and
anglers practice Clean, Drain, Dry, the movement
of invasives can be stopped!
Wader cleaning stations are an effective tool
available for containment of NZMS that is currently
being used in western states and evaluated for use
in Colorado.
Angler Recommendations (for those with no boats):
Keep all angling gear free of mud, plants, and organic debris in between each and every use.
Unknowingly moving a species from one body of water to another, even within different
stretches of the same river, can start a domino effect of invasion, causing irreversible ecological
damage. It is especially important to keep waders clean.
Anglers should scrub the bottom of boots or waders with a brush and remove all mud, plants,
and organic materials in between each and every use. Anglers should then perform ONE of the
following options before going into the next body of water:

39

�OPTION 1 - Spray or soak waders and gear with 140º Fahrenheit water for at least 10 minutes.
OPTION 2 - Place waders and boots in a freezer overnight between uses.
OPTION 3 - Dry your waders and equipment
completely for a minimum of 10 days between
use.
OPTION 4 - Submerge waders and gear in a
large tub filled with a mixture of 6 ounces per
gallon quaternary ammonia-based institutional
cleaner (such as Super HDQ Neutral) and water
for at least 10 minutes, scrubbing debris from
the gear, and visually inspecting the gear for
snails before rinsing. Follow all precautionary
label instructions! Rinse water must be from a
New Zealand mudsnail-free source (to avoid reinfection), and the chemical bath must be
properly disposed of, away from the water
body.

WID Procedures for NZMS Containment:
•

High risk exit inspection focusing on the
exterior of the boat and any mud or
algae on the hull or trailer, carpeted
areas, intakes and compartments that
may hold standing water.

•

If NZMS are discovered, remove snails
by hand if possible and perform a full
decontamination exposing the snails to
140º Fahrenheit water for at least 10
minutes.

40

�OTHER ANS CONTAINMENT – RUSTY CRAYFISH
Rusty crayfish are native to the Ohio River Basin. They were most likely introduced as bait or
illegally stocked as prey for fish. These crayfish eat small fish, insects, and fish eggs. They also
eat aquatic vegetation, damaging underwater habitat important for fish spawning, cover, and
food. They are very aggressive and displace or eliminate native crayfish. Invasive crayfish can
have inordinately large effects on native aquatic species due to their complex role in food webs
as prey and their polytrophic feeding habits (Kerby et al., 2005; Usio et al., 2006; Ilheu et al.,
2007). Because crayfish are generally larger, longer lived, and more mobile than most other
invertebrates in a given ecosystem, these crustaceans can greatly affect the systems they
inhabit (Lorman and Magnuson, 1978; Momot, 1995).
The rusty crayfish was believed to be established in only one site west of the Continental Divide
in Washington (Olden et al., 2009), however, rusty crayfish now occur in the upper Yampa River
within and below Catamount Reservoir (2009), in Sanchez Reservoir (2010) and in Stagecoach
Reservoir (2011). A trained boat inspector discovered the population of rusty crayfish at
Sanchez Reservoir State Wildlife Area. It is common for boat inspectors to see crayfish being
used as bait, harvested for bait or harvested for human consumption.
Rapid response to rusty crayfish in Colorado included a
regulation to prohibit the live transport of invasive crayfish:
• Live transport of crayfish west of the Continental Divide
is prohibited. All crayfish caught west of the Continental
Divide must be immediately killed by removing the head
from the thorax and taken into possession, or
immediately returned to the water from which they
were taken.
• The CPW has issued an order that prevents the
transport of any live crayfish from Sanchez Reservoir
SWA.
WID Procedures for Rusty Crayfish Containment:
• Always ask about live aquatic bait when performing entrance and exit inspections, even
if the boater has a green seal and receipt.
• If crayfish are discovered during an inspection, ask for a receipt and follow bait
procedures.

41

�OTHER ANS CONTAINMENT - WATERFLEAS
Spiny and fishhook waterfleas are small predacious crustaceans that are zooplankton. Similar to
ZQM, both arrived in ship’s ballast water from Eurasia.
Waterfleas can reproduce sexually or asexually. They can spread to inland waters when
recreational gear is contaminated with egg-laden females. When females die out of water,
under certain conditions they produce eggs that resist freezing and drying, and can remain
viable. Laid eggs in the benthic zone of lake or reservoir can remain viable for years and hatch
when conditions are optimal. Under certain conditions, waterfleas can establish a new
generation within two weeks. Eradicating established infestations is impossible.
Presently, the best defense against waterfleas is to prevent their transfer to new waterbodies
through the current WID procedures. Waterflea eggs and adults can get into bilge water, bait
buckets, live wells and coat fishing lines when boating or fishing in infested waters.
WID Procedures for Waterflea Containment:
• High risk inspection, with a focus on equipment, fishing tackle and nets; and remove any
visible plants or animals.
• Drain water from all compartments and motor/engines.
• Standing water decontamination for compartments that cannot drained (e.g. ballast).
• Bait treatment for live aquatic bait, if applicable.
• Full decontamination of boat and equipment if waterflea or other ANS are found on the
watercraft or trailer.

42

�CONCLUSION
In an effort to protect Colorado and regional water bodies, implementation of containment
WID procedures to stop the spread of ANS is among the highest priority of the Colorado
Invasive Species and ANS Programs. This document not only outlines Colorado’s containment
strategy, but is intended to provide options to other managers seeking to respond rapidly to a
verified detection and stop the spread of ANS overland on watercraft. Managers should
consider the options outlined in the Infested Waters Containment Spectrum and Geographic
Approach when implementing WID at infested waters with minimal resources.
A comprehensive WID containment program should include entrance and exit inspections on
trailered, motorized watercraft. A complementary strong education and information campaign
is a high priority for prevention and containment. Monitoring and enforcement are also crucial
portions of implementing any WID program.
When conducting exit inspections at positive or
infested waters, there are five key points for
managers and inspectors at containment
locations to remember:
1. All boats exiting need to have a high
risk inspection.
2. All boats exiting need to be fully
drained.
3. If the boater is not returning or is
unsure where they are going next,
A quagga mussel infested gimbal unit
then a standing water decontamination
is required for motors and engines, and
compartments that cannot be drained (e.g. ballast tank, I/O, Inboards, etc.).
4. If adult mussels are found attached to a boat, a full decontamination is required.
5. A green seal and receipt must be applied to all boats leaving containment locations,
in addition to being documented on the WID Activity Log or Data Collectors.
With growing regional and national communication, support and partnerships, the future of
zebra and quagga mussel containment and prevention in the West continues to evolve and
shows promise for a coordinated future strategy.

43

�This page left intentionally blank.

44

�Colorado Parks &amp; Wildlife
Invasive Species Program – A.N.S.
6060 Broadway, Denver, CO 80020
Program Office: 303-291-7295
Fax: 303-291-7104
Elizabeth Brown
Invasive Species Coordinator
Elizabeth.Brown@state.co.us

45

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