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14 <br />Backwaters, eddies, and runs have been reported as common capture locations for young-of-year <br />humpback chub (Valdez and Clemmer 1982). These data indicate that in Black Rocks and <br />Westwater Canyon, }•oung utilize shallow azeas. Habitat suitability index curves developed by <br />Valdez et al. (1990) indicate young-of--year prefer average depths of 2.1 feet with a maximum of <br />5.1 feet. Average velocities were reported at 0.2 feet per second. <br />Valdez et al. (1982) and Wick et al. (1979, 1981) found adult humpback chub in Black Rocks <br />and Westwater Canyons in water averaging 50 feet in depth with a maximum depth of 92 feet. In <br />these localities, humpback chub were associated with large boulders and steep cliffs. <br />Generally, humpback chub show fidelity for canyon reaches and move very little (Miller et al. <br />1982; Archer et al. 1985; Burdick and Kaeding 1985; Kaeding et al. 1990). Movements of adult <br />humpback chub in Black Rocks on the Colorado River were essentially restricted to a one mile <br />reach. These results were based on the recapture of Cazlin-tagged fish and radiotelemetry studies <br />conducted from 1979 to 1981 (Valdez et al. 1982) and 1983 to 1985 (Archer et al. 1985; USFWS <br />1986; Kaeding et al. 1990). <br />Critical Habitat <br />Critical habitat has been designated within the humpback chub's historical range in the following t <br />sections of the Upper Basin (59 F.R 13374). <br />Colorado. Moffat County. The Yampa River from the boundary of Dinosaur National <br />Monument in T. 6 N., R. 99 W., section 27 (6th Principal Meridian) to the confluence with <br />the Green River in T. 7 N., R. 103 W., section 28 (6th Principal Meridian). <br />Utah. Uintah County: and Colorado. Moffat County. The Green River from the confluence <br />with the Yampa River in T. 7 N., R 103 W., section 28 (6th Principal Meridian) to the <br />southern boundary of Dinosaur National Monument in T. 6 N., R 24 E., section 30 (Salt <br />Lake Meridian). <br />Utah. Uintah and Grand Counties. The Green River (Desolation and Gray Canyons) from <br />Summer's Amphitheater in T. 12 S., R. 18 E., section 5 (Salt Lake Meridian) to Swasey's <br />Rapid in T. 20 S., R. 16 E., section 3 (Salt Lake Meridian). <br />Utah. Grand County: and Colorado. Mesa County. The Colorado River from Black Rocks <br />in T. 10 S., R. 104 W., section 25 (6th Principal Meridian) to Fish Ford in T. 21 S., <br />R. 24 E., section 35 (Salt Lake Meridian). <br />• <br />