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m~TSODs <br />~,.r <br />~° <br />Backwaters in the study reach were sampled for the presence of endangered fishes four <br />months each year from 1994 through 1996. Sampling months were chosen to coincide with <br />unportant time periods in the lives of YOY chubs and Colorado squawfish. These were:. after <br />chub swim-up (July), after Colorado squawfish m-up (August}, prior to the falUwinter season <br />(September) and prior to spring peak flows (April). Some deviation from this plan was necessary. <br />Although sampling began in June of 199'4, June sampling was eliminated from 1995 and 1996 <br />sampling because it was thought to be~.%"`"ly to be certain of chub swim-up. Also, July 1995 <br />and April 1997 sampling were canceled due to high water. <br />Backwater sampling was based on the ISMP post-larvaUage-0 Colorado squawfish <br />monitoring format (USFWS 1987), but was expanded to provide more detailed data. In June <br />1995 every backwater encountered between RK 345.9 and RK 212.4 was sampled for endangered <br />fish. The same sampling regime was attempted in July 1995. However, because of the number of <br />backwaters encountered, this was abandoned at RK 281.6 from which point only the first <br />backwater encountered in each 1.6 km section was sampled. All subsequent sampling coincided <br />with established adult chub monitoring stations previously established by UDWR. These five-mile <br />stations were: RK 301.7-293.6, RK 285.6-277.6, RK 261.5-253.4 (all in Desolation Canyon) and <br />RK 237.3-229.3 (Gray Canyon} (Figure 1). <br />Sampling began at the upstream end of the study reach and continued in a downstream <br />direction. All backwaters encountered were sampled by a crew of four to six persons in outboard <br />powered white-water rafts. Each backwater encountered was approached with caution in an <br />