7281 ‎(2)‎

• 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

Table II-2 (Continued)
Irrpact Findings of Environmental Assessmentl/ _
n
00
m
Impacts of the
Potentially Affected Resource Impacts of the Proposed Action "No Action" Alternative
D. Nonnative Fishes (with Coldwater fish: The Proposed Action has the Coldwater fish: Same as Proposed Action.
emphasis on sport fish) potential to benefit or adversely impact
coldwater fishes in tailwaters as a result
of changes in dam releases. Ruedi releases
are expected to cause sore loss of brown
trout spawning habitat, but the remaining
habitat is still greater than the amount
necessary to sustain a quality trout popu-
lation. Flaming Gorge summer releases should
benefit the tailwater trout fishery, but
enhanced autumn/winter releases might result
in a negative inpact. Aspinall August-September n
releases in dry years should benefit the trout
fishery downstream. M

WanTwater fish: The program could have an
Wanrwater fish: Similar to Proposed Action, i.e., z
-?
adverse impact on nonnative fishes identi- this alternative could adversely impact problem M
fied as "problem" species, i.e., nonnative wamwater nonnative fish. However, adverse impacts rn
species known to prey on or compete with to problem wamwater fish would occur more gradu-
the rare and endangered fishes. The degree ally than under the Proposed Action.
of impact would depend on the control method
used, the species involved, and the intensity o
of the control effort. However, inpacts are
not expected to be major.
M
E. Terrestrial Biological Resources -o
1. Waterfowl habitat The assumed flow releases from Flaming Gorge Sane as Proposed Action. o
will not affect waterfowl nesting in the o
spring. Increased auturn flaws will benefit m
migrating waterfowl. Reduced summer flaws o
from Flaming Gorge will likely result in
increased purging costs at waterfowl manage-
ment areas in average to wet years. C)