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03/13/96 15:08 0303 245 6933 FISH & WILDLIFE 4-+4 R 0 4 Denver 9010/011 <br />of dewatering routinely occur during low-flow years in the summer months of June <br />through September when irrigation demands.are highest, July and August being the <br />lowest flow months of record, following construction of the Aspinall Unit <br />reservoirs upstream. Researchers (Wiltzius 1978; Valdez et al. 1982) believed <br />that the Redlands Diversion Dam eliminated upstream movement during low-flow <br />periods from the Colorado River and further reduced Colorado squawfish numbers <br />in the Gunnison River by preventing upstream movement past the dam. <br />The purpose of this investigation was to conduct biological and <br />hydrological investigations of the 2.3-vile reach of the lower Gunnison River <br />between the Redlands Diversion Dam and the confluence of the Colorado River from <br />March 1994 to November 1994. <br />Specific obJectives were to: <br />1. retrieve former data on capture, sightings, and locations used by <br />radiotagged Colorado squawfish in the reach and correlate with flows <br />during the dates of occupancy, <br />2. obtain seasonal distribution information for adult Colorado squawfisn <br />from March to October in the plunge pool immediately downstream of the <br />Redlands Diversion Dam (RM 3.4) and in the 2.2-mile reach downstream <br />of the Redlands Diversion Dam, <br />3. obtain microhabitat fish use data, depth, velocity, and substrate. fo- <br />captures of sub-adult and adult Colorado squawfish, <br />4. correlate catch rates of native and nonnative fishes with various <br />water depths and flows, <br />