6006

• UCREFRP Catalog Number: 6006
• Author: Holden, P. B. and L. W. Crist.
• Title: Documentation of Changes in the Macroinvertebrate and Fish Populations in the Green River Due to Inlet Modification of Flaming Gorge Dam
• USFW Year: 1981.
• USFW - Doc Type: Final Report.
• Copyright Material: NO

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depth, velocity, substrate and habitat type were measured at the exact
location of capture (see Appendix IV for data).
The pattern of sampling at each station was similar during each
sampling period within the confines of the station as indicated above.
The intent of the study was not to catch every fish possible, but rather
to representatively sample all available habitats, with emphasis on
locating all the species present, especially young fish. Each station
was sampled intensively for about 4 hours, with areas above and below
the station being sampled less intensely for up to 2 additional hours.
This latter effort was aimed at finding rare fish.
Additional samples were taken at Lodore and Alcove Brook in March
1979 to test the efficiency of sampling under a high and a low river
flow. The Water and Power Resources Servi ce provi ded flows of 1200 cfs
for low flow samples and 4000 cfs for high flow samples. The flows were
produced on consecutive days at each of the stations, thus decreas i ng
the chance that fish populations had changed between the samplings.
Sampling areas and procedures were the same for the two samples within
each station. Data given in the text of this report refers to the catch
during the 1200 cfs flow unless otherwise noted, since most samples were
taken at Lodore and Alcove Brook during low flows.

PRE-MODIFICATION CONDITIONS - LITERATURE REVIEW

Temperature and Flow
The Green River in the study area can be analyzed in three time
periods based on temperatures and flows prior to 1978. The first period

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