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                  <text>“Coronado sets out to the north”
— oil painting by Frederic Remington.

A Species
in Time

Threats and Current Status

Today, because of a host of pressures, the Rio Grande cutthroat
occupies only 10–12 percent of its historic range.

T

he Rio Grande cutthroat was
the first trout to be encountered
by Europeans in the West. In 1541,
Francisco de Coronado’s expedition to find
the mythical cities of gold came across the Rio Grande cutthroat
in the upper Pecos River near what is now Santa Fe, New Mexico.

The primary threats to Rio Grande cutthroat
include:
• Nonnative trout. Rainbow trout, an

introduced species, as well as other
cutthroat subspecies have the ability to
hybridize with the Rio Grande cutthroat
and therefore jeopardize genetic integrity
at the population level. Other non-native
trout, including brown trout and brook
trout, threaten the Rio Grande cutthroat
through competition for habitat and prey.
To address the threats from non-natives,
populations of Rio Grande cutthroat
often require a physical separation in the
form of a man-made or natural barrier.
While these barriers are necessary, they
can isolate populations and therefore
make them more vulnerable to natural
disturbances like wildfire and drought.

All 14 cutthroat trout subspecies (two of them now extinct) share a common
ancestor that branched off from the rainbow trout at the end of the Pliocene
epoch around 2 million years ago. The Rio Grande cutthroat branched off from
the Colorado River cutthroat into the previously unoccupied Rio Grande basin
following the last glacial period around 70,000 years ago.
In 1878, Forest and Stream magazine reported an account of Colorado Governor
Hunt taking a general from Pennsylvania fishing on Trinchera Creek near Fort
Garland. The story follows that the governor heard a commotion and saw a
big fish flying through the air. He found the general hoisting a three-pound
Rio Grande cutthroat over his shoulder and exclaiming, “oh, I have a leg of
mutton on my hook.”

To this day, Trinchera Creek is a stronghold for RGCT, thanks to a partnership
between Colorado Parks and Wildlife and Louis Bacon’s Trinchera Blanca Foundation.

A Southwest Treasure
The Rio Grande cutthroat is the native

trout of the Rio Grande and its tributaries
in Colorado and New Mexico. It’s a beautiful,
unique cutthroat trout sub-species and
exciting game fish.

It belongs here, because it has adapted to
our region for eons. Rio Grande cutthroat
are part of our culture and angling heritage.

• Mining and irrigation development

“If the philosophical, theoretical, and practical values associated with
cutthroat trout were better understood, insensitivity and opposition
to their restoration and protection would greatly diminish.”

can have negative impacts if improperly
managed. With climate change
predictions and an ongoing drought in
the Southwest, the challenge is to reduce
these negative impacts while sustaining
agriculture and the local economies.

• Roads, logging, and grazing.

Cutthroat trout are sensitive to changes
in water quality. Increased sedimentation
created by roads, logging, and grazing
can degrade spawning habitat. Decreases
in concentrations of dissolved oxygen
caused by higher stream temperatures
and excessive nutrient inputs
further restrict Rio Grande cutthroat
distribution and reproductive success.
Collaborative planning and management
of these activities that account for
healthy stream and riparian function
is crucial to sustaining both RGCT
populations and traditional resource use
activities.

The Rio Grande cutthroat trout is currently
a candidate for listing protection under the
Endangered Species Act of 1973. The
U.S. Fish and Wildlife Service will make a
decision on whether or not to list the Rio
Grande cutthroat sub-species in 2014. Trout
Unlimited supports the efforts of the Range
Wide Conservation team that has been
working to protect, conserve, and restore
populations of RGCT for over a decade.

—Robert J. Behnke, aka “Dr. Trout”

Partners

How You Can Help

We want to offer a special thanks to all of the great partners that have
joined forces to get this important information out to anglers like you.
The future of the Rio Grande cutthroat depends on collective awareness.

Take the Survey
Information from anglers
is vital to protecting the
Rio Grande cutthroat.

Your tax-deductible contributions to Trout
Unlimited will help directly fund projects for Rio
Grande cutthroat in Colorado, including habitat
restoration, streamflow improvements, and other
work that makes fishing better. We invite you
to be an important partner in this great cause.

Please take a few minutes for a brief
survey about Rio Grande cutthroat trout
at www.tu.org/rgct

To donate directly, send a check payable to Trout
Unlimited Rio Grande Basin. Write “Rio Grande
cutthroat trout” in the memo line, and include a
return address to receive a receipt.

Your survey response is extremely
important. It will help Trout Unlimited
protect, reconnect, and restore
populations of Rio Grande
cutthroat trout in Colorado.

Mail to: K
� evin Terry
Rio Grande Basin Project Manager
Trout Unlimited
P.O. Box 281
Del Norte, CO 81132

Photo: Frank Weissbarth

Fly Shop Partners

Other Partners

Conejos River Anglers
(719) 376-5660 www.conejosriveranglers.com

San Luis Valley Chapter Trout Unlimited

Connect

Duranglers Flies and Supplies
(970) 385-4081 www.duranglers.com

There are many other ways for you to help
your native cutthroat trout. Please contact
Kevin Terry at kterry@tu.org to sign up to
be an on-the-ground advocate and volunteer
for Rio Grande cutthroat work.

Ramble House and Creede Outfitters
(719) 658-2482 www.ramblehouse.net

Become a member of TU! Go to tu.org

Rio Grande Anglers
(719) 658-2955 www.riograndeangler.com
Wolf Creek Anglers
(719) 873-1414 www.wolfcreekanglers.com

RGCT Range-Wide Conservation Team
Colorado Division of Parks and Wildlife
New Mexico Department of Game and Fish
National Park Service • Bureau of Land Management
United States Forest Service • United States Fish and
Wildlife Service • Taos Pueblo • Mescalero Apache
Tribe • Jicarilla Apache Nation
This brochure was funded by the small grants program of the
Western Native Trout Initiative. To learn more, or to find out
how to help the cause, please visit www.wnti.org.

Design: Jeremy Carlson

Contribute

�Natives

Colorado Parks and Wildlife (CPW) has an
extensive program that offers anglers the
opportunity to fish for Rio Grande cutthroat
trout. Over 80 recreational populations have
been established in high mountain lakes and
streams throughout the Rio Grande Basin
of Colorado. These populations are intended
to provide opportunities for anglers to catch
RGCT. CPW maintains these populations
through stocking by plane, pack animals,
and vehicles.

Bamboo rod photo courtesy of R.L. Winston Rod Co.

Fishing

Lifespan

R� io Grande cutthroat
typically live 5-8 years.

Diet

R� io Grande cutthroat primarily feed on
aquatic and terrestrial insects, although at
larger sizes they can be piscivorous, eating
small fish.

Oncorhynchus Clarki virginalis

R i o G r a n d e C u t t h r o a t Tr o u t
1˝

Color

Some favorite recreational populations
are listed below. Some of these lakes and
streams have other species of trout too.
You can find a complete list as well as
information on the management of the
species by searching for “cutthroat trout”
at cpw.state.co.us.

2˝

3˝

4˝

5˝

6˝

R� io Grande cutthroat display a variety
of colorations including bright crimson
red and orange on the belly. The sides
of the fish are golden yellow trending to
a greenish hue on the back. They have
large spots concentrated near the tail.

7˝

8˝

Size

9˝

R� io Grande cutthroat size is variable,
and based on the available habitat.
In small headwater streams adults are
generally 6-10˝ in length.

10 ˝

11 ˝

12 ˝

13 ˝

In larger streams and
rivers, adults can reach
sizes of 14-15˝.
In lakes they can reach
lengths of over 20˝ and
weights up to 5 lbs.

La

k

es

S

treams

Spawning Season
QQArchuleta Creek
QQAdams Fork
Conejos River
QQConejos River,
Middle Fork
QQConejos River,
North Fork
QQConejos River,
South Fork
QQHanson Creek
QQLost Trail Creek
QQWest Lost
Trail Creek

QQPole Creek

QQAlberta Park
Reservoir
QQBear Lake
QQBeaver Lake
QQBlue Lake
(Conejos Basin)
QQCliff Lake
QQComo Lake
QQNorth
Crestone Lake
QQSouth
Crestone Lake
QQDeadman Lakes
QQGlacier Lake
QQGoose Lake
QQGreen Lake
QQHeart Lake
QQKerr Lake
QQLa Jara Reservoir

QQLost Lake
QQRed Lake
QQRock Lake
QQBig Ruby Lake
QQLittle Ruby Lake
QQLittle Sand
Creek Lake
QQLower Sand
Creek Lake
QQUpper Sand
Creek Lake
QQLower
Spruce Lake
QQUpper
Spruce Lake
QQTrail Lake
QQTrout Lake
QQUte Lakes
QQLower Willow
Creek Lake

Don' gt et!
for

Rio Grande cutthroat spawn in the spring
following runoff, when water temperatures
approach 50° F. This takes place from
March through July across their range.

QQProspect Creek
QQRio Grande above
Rio Grande Res
QQMiddle
Saguache Creek

Illustration ©
Joseph R. Tomelleri

Larger spots near the tail
are often club-shaped.

QQSouth Fork
Saguache Creek
QQSquaw Creek
QQTreasure Creek
QQUte Creek
QQWeminuche
Creek

Check Colorado state fishing
regulations and practice proper
catch-and-release methods

Rio Grande cutthroat

HISTORIC AND
CURRENT RANGE

This map of the upper Rio Grande River Basin
shows how the Rio Grande cutthroat range has
receded over time.
Saguache

g Historic Range

Saguache

g Current Range

S A N

0 2

Mineral

Rio Grande

Alamosa

South Fork

L U I S

Rio Grande Del Norte
Alamosa
Blanca

V A L L E Y
Co

Costilla

Conejos
ne

jos

R.

N E W

Antonito

M E X I C O

5

10

Fishing Tips

Fishing Tactics:

Connecting Ecology and Fishing:

Streams— Stealth, stealth, stealth! Take your time
to sneak up to good habitat and scan the water. You
can often see your quarry before you cast. Light
(2–3wt) fly rods that are 6–8 ft. long are perfect for
high country streams that are tight and overgrown.
Approach from downstream, keep a low profile, and
always pay attention to your shadow.

Rio Grande cutthroat trout inhabit high elevation
streams and lakes. These ecosystems are generally
low in algae and plant productivity. In streams,
organic material like leaves and wood from riparian
vegetation are very important energy sources to the
system.

Lakes— Fishing for Rio Grande cutthroat in lakes
can be challenging. However, it can often be the
25 MI
most rewarding, especially if you are after larger fish.
There are lakes in Colorado that have 20+ inch RGCT.
If feasible, a personal watercraft like a float tube or
small boat is nice to have. Dry fly
Fly Box
fishing is usually better in low
w Sallys,
llo
light conditions around dawn
Ye
s,
am
Ad
te
hu
Dry flies — Parac f, hoppers, ants, beetles,
and dusk. When the fish are
ulf
W
l
es
stimulators, Roya
dg
mi
r
he
ot
d
an
not rising, fish nymph patterns
th’s Gnats
elk hair caddis, Griffi
deep, or strip woolly buggers and
, Copper Johns,
hs
mp
Ny
e
streamers around structure. A 9
inc
Pr
—
Nymphs
rvae &amp; pupae),
(la
is
dd
ca
,
foot 5-6 weight fly rod is a good
hs
mp
ny
stonefly
midae
fly nymphs, Chirono
el
ms
da
choice for lake fishing.
rs,
Ea
's
re
Ha
streamers
Woolly Buggers,
nymphs &amp; emergers,
.
frog, salamander) etc
(minnows, crayfish,

Aquatic insects that use this material as food are
commonly referred to as shredders. There are
shredders in the stonefly, caddis, and mayfly families.
Terrestrial insects like ants, beetles, and grasshoppers
are also significant to the RGCT diet in headwater
streams. The season for feeding and growth is
short in the high country. Therefore, these fish are
opportunistic, and often the fly choice is not as
important as presentation and stealth.
High country lakes that hold Rio Grande cutthroat
differ ecologically from the streams. They often have
more algae and plant growth, and host other aquatic
insects. Chironomidae midges are common in these
lakes as well as caddis and mayflies. Dragonflies and
damselflies are likely residents if there are aquatic
plants present. Other possible prey items include
snails, frogs, scuds, salamanders, and even small
trout or minnows.

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              <text>&lt;p&gt;Rio Grande cutthroat trout,&amp;nbsp;&lt;em&gt;Oncorhynchus clarkii virginalis&lt;/em&gt;, ​can be found in high elevation streams and lakes of the Rio Grande, Canadian, and Pecos River drainages in Colorado and New Mexico, giving it the southern-most distribution of any form of Cutthroat Trout. It now only occupies just 12 percent of its historic habitat in approximately 800 miles of streams. Biologists estimate that 127 conservation populations now exist in the two states, and 57 of those populations are considered to be secure.&amp;nbsp; The historic range of Rio Grande cutthroat trout has been reduced over the last 150 years due to many changes on the landscape, including: drought, water infrastructure, habitat changes, hybridization with nonnative Rainbow and Cutthroat Trout, and competition with Brook and Brown Trout.&amp;nbsp; As a result, pure populations of Rio Grande Cutthroat Trout are restricted primarily to headwater streams.​ &lt;br /&gt;&lt;br /&gt;The first conservation agreement for Rio Grande Cutthroat Trout ​between state, federal, and tribal resource agencies was signed in 2003, and gave rise to the Rio Grande Cutthroat Trout Conservation Team. The stated goal of the agreement is to assure the "long-term viability of Rio Grande Cutthroat Trout throughout its historic range by minimizing or removing threats to the species and promoting conservation." This collaborative framework was updated in the&amp;nbsp;&lt;a href="https://cpw.catalog.aspencat.info/Files/1131/ViewPDF"&gt;2013 Conservation Agreement&lt;/a&gt;(12MB) ​and the ​&lt;a href="https://cpw.catalog.aspencat.info/Files/1153/ViewPDF"&gt;2013 Conservation Strategy&lt;/a&gt;&amp;nbsp;which outline long-term conservation objectives for this subspecies.&lt;/p&gt;&#13;
&lt;p&gt;&lt;strong&gt;Conservation Team D&lt;/strong&gt;&lt;strong&gt;​ocuments&lt;/strong&gt;&lt;/p&gt;&#13;
&lt;p&gt;&lt;strong&gt;Status Assessments&lt;/strong&gt;&lt;/p&gt;&#13;
&lt;ul&gt;&#13;
&lt;li&gt;​&lt;a href="https://cpw.catalog.aspencat.info/Files/2223/ViewPDF"&gt;2016 Status Assessment&lt;/a&gt;​​​&lt;/li&gt;&#13;
&lt;li&gt;&lt;a href="http://hermes.cde.state.co.us/drupal/islandora/object/co:32436/datastream/OBJ/view"&gt;2008 Status Assessment&lt;/a&gt;&amp;nbsp;(27MB)​&lt;/li&gt;&#13;
&lt;/ul&gt;&#13;
&lt;p&gt;&lt;strong&gt;Conservation Strategies&lt;/strong&gt;&lt;/p&gt;&#13;
&lt;ul&gt;&#13;
&lt;li&gt;​&lt;a href="https://cpw.catalog.aspencat.info/Files/1153/ViewPDF"&gt;2013 Conservation Strategy&lt;/a&gt;&lt;/li&gt;&#13;
&lt;li&gt;&lt;a href="http://hermes.cde.state.co.us/drupal/islandora/object/co:32436/datastream/OBJ/view "&gt;2013 Conservation Agreement&lt;/a&gt;​&lt;/li&gt;&#13;
&lt;/ul&gt;&#13;
&lt;p&gt;&lt;strong&gt;Rangewide Accomplishments&lt;/strong&gt;&lt;/p&gt;&#13;
&lt;ul&gt;&#13;
&lt;li&gt;&lt;a href="https://cpw.cvlcollections.org/files/original/491ccf041bcdac70dfa4359e1347bee2.pdf"&gt;2022&amp;nbsp;Rangewide Accomplishments​&lt;/a&gt;​&lt;/li&gt;&#13;
&lt;li&gt;&lt;a href="https://cpw.cvlcollections.org/files/original/a4870ed12f6272c0dfc5bb51e11340cf.pdf"&gt;2021 Rangewide Accomplishments&lt;/a&gt;​&lt;/li&gt;&#13;
&lt;li&gt;&lt;a href="https://cpw.cvlcollections.org/files/original/d72d6f7bee18e72396204a81f496c868.pdf"&gt;2020 Rangewide Accomplishments&lt;/a&gt;&lt;/li&gt;&#13;
&lt;li&gt;&lt;a href="https://cpw.cvlcollections.org/files/original/a3e87c667a2bae84b8a833663bbf8fe7.pdf"&gt;2019 Rangewide Accomplishments&lt;/a&gt;&lt;/li&gt;&#13;
&lt;li&gt;&lt;a href="https://cpw.cvlcollections.org/files/original/a8c9f0970f5ae5c62c9f3467e775bf5c.pdf"&gt;2018 Rangewide Accomplishments​&lt;/a&gt;​&lt;/li&gt;&#13;
&lt;li&gt;&lt;a href="https://cpw.cvlcollections.org/files/original/56fdcfced340a561fcf9c564638bea65.pdf"&gt;2017 Rangewide Accomplishments&lt;/a&gt;&lt;/li&gt;&#13;
&lt;li&gt;&lt;a href="https://cpw.cvlcollections.org/files/original/bdda4e71eebcd06ebb798a68935b38eb.pdf"&gt;2016 Rangewide Accomplishments&lt;/a&gt;&lt;/li&gt;&#13;
&lt;li&gt;&lt;a href="https://cpw.cvlcollections.org/files/original/bab05f5daa567b5909ad3793831444a7.pdf"&gt;2015 Rangewide Accomplishments​&lt;/a&gt;&lt;/li&gt;&#13;
&lt;li&gt;&lt;a href="https://cpw.cvlcollections.org/files/original/52a15ecbcfd8ae9e55f28c214d88f3ca.pdf"&gt;2014 Rangewide Accomplishments&lt;/a&gt;&lt;/li&gt;&#13;
&lt;li&gt;&lt;a href="https://cpw.cvlcollections.org/files/original/d9260d50800a46b88bba19dabeec62a7.pdf"&gt;2013&amp;nbsp;​Rangewide Accomplishments&lt;/a&gt;&lt;/li&gt;&#13;
&lt;li&gt;&lt;a href="https://cpw.cvlcollections.org/files/original/bcd4e2fab0cb6836091f6ab30b52939b.pdf"&gt;2012 Rangewide Accomplishments&lt;/a&gt;&lt;/li&gt;&#13;
&lt;li&gt;&lt;a href="https://cpw.cvlcollections.org/files/original/05da6469f8a5e23a48e16b0ec2bdc7cc.pdf"&gt;2011 Rangewide Accomplishments&lt;/a&gt;&lt;/li&gt;&#13;
&lt;li&gt;&lt;a href="https://cpw.cvlcollections.org/files/original/fceabc65451412ae0a059c96a3b02724.pdf"&gt;2010 Rangewide Accomplishments&lt;/a&gt;&lt;/li&gt;&#13;
&lt;li&gt;&lt;a href="https://cpw.cvlcollections.org/files/original/df1ecfede569d32a46f6f3abb9fb1624.pdf"&gt;2009 Rangewide Accomplishments&lt;/a&gt;&lt;/li&gt;&#13;
&lt;li&gt;&lt;a href="https://cpw.cvlcollections.org/files/original/24c597c44496bf8f2a30647df057c241.pdf"&gt;2008 Rangewide Accomplishments&lt;/a&gt;&lt;/li&gt;&#13;
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