7824

• UCREFRP Catalog Number: 7824
• Author: Miller, W. H., et al.
• Title: Colorado River Fishery Project, Part III, Final Report, Contracted Studies.
• USFW Year: 1982.
• USFW - Doc Type: \
• Copyright Material: NO

limited areas within major reaches. Anomalous reaches in their respec-
tive segments are listed below. 0
Stratum or river
segment (miles)
Green River
A
C
F
Colorado River
0-48
71-86
Analomous miles
None
12-20 (below Nefertiti)
Horseshoe bend (164, 175-176)
The loop (5-11)
Mile 35 and miles 77-86
The remaining river miles were then randomized, and four random
miles selected at each stream. These were to be evaluated both on aerial
photographs (1:31,680 Color Infra Red from BLM) and on-site during the
April 14-19 reconnaissance trip.
The following river miles were drawn randomly for each segment on
the Green and Colorado Rivers:
Stratum or river segment (miles)
Green River
A
C
F
Colorado River
0-46
71-86
Randoml y selected miles

24 52 56 73
20 21 24 29
135 144 148 160
24 27 36 38
73 75 79 80
In-the-field observation of the Colorado River reaches led to
preferences for stations at mile 39 in the downstream reach (hereafter
called "Potash") because it corresponded with a good hydraulic control
point and because it was considered accessible by boat during the high
flow regime. This reach was characterized by steep sandstone cliffs or
slopes along approximately 2/3 of the right bank. The left bank was a
sandbar separated from the floodplain by a dense bank of tamarisk.
Upstream from Moab, Utah, site selection was strongly influenced
by accessibility because the recurrent rapids were probably not navigable
by aluminum boats at high water. The reach beginning at mile 72 was
selected because it was within boat motoring distance of the boat launch
and terminated downstream at a marginal flow control point.
Field reconnaissance of the Green River study strata led to the
selection of three potential study site locations.
Within stratum (segment) "A", river mile 56 was chosen to represent
the Labyrinth Canyon segment. This study site is located 4 miles above
Mineral Bottom and is characterized by alluvial bars, islands, cliff
areas, and a meandering thalweg. Six transects were established over
flow control points and existing aquatic habitat.
Stratum (segment) "C" was represented by river mile 21. This site
was chosen both because it was located upstream from Nephertiti rapids

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