7281

• UCREFRP Catalog Number: 7281
• Author: U.S. Fish and Wildlife Service.
• Title: Recovery Implementation Program for Endangered Fish Species in the Upper Colorado River Basin, Environmental Assessment, November 1987.
• USFW Year: 1987.
• USFW - Doc Type: Denver, Colorado.
• Copyright Material: NO

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Table ES-1 (Continued)
Impact Findings of Environmental Assessment
Executive Surwryl/
M
Impacts of the
Potentially Affected Resource Impacts of the Proposed Action "No Action" Alternative
3. Water quality
4. Channel maintenance
B. Rare and Endangered Fishes
C. Native Fishes (other than
the rare and endangered
fishes)
No substantial change in water quality is
expected.
Assumed flows will have minimal effects on
channel erosion and sediment deposition.
Slight changes in channel stability may
occur.
The Colorado squawfish, humpback chub, and
bonytail chub will be recovered and taken
off the Endangered Species list; the razor-
back sucker will be managed so that it
would not need the protection of the Endan-
gered Species Act. [Note: If the razorback
sucker is listed, it will be treated as the
other species under the Proposed Action.
There will be no impacts to coldwater
native fishes in headwaters. Exact impacts
to wanes ater native fishes are uncertain,
though flow changes, habitat development,
and control of nonnative fishes may result
in minor shifts in species composition and
benefits to warmwater native fishes,
overall.
Same as Proposed Action.
Same as Proposed Action.
Although the Colorado squawfish, humpback chub,
and bonytail chub will be protected from
extinction, it is not clear that they will be
recovered under this alternative. The razorback
sucker may need to be federally listed as an
endangered species to prevent its extinction.
There will be no impacts to coldwater native fishes
in headwaters. Warmwater native species may
decline in abundance as nonnatives continue to
proliferate, carpeting with or preying on native
species.
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x
m
n
c
m
N
c
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