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• 1J <br />Utah. Garfield and San Juan Counties. The Colorado River from Brown Betri~ Rapid in T. <br />30 S., R. l3 E., section 34 (Salt Lake Meridian) to Imperial Canyon in T. 3l 8., R. 17 E., <br />section 28 (Bait Lake Meridian). <br />Bom~tail <br />The bony~tail is the razest native fish in the Colorado River. Formerly reported as widespread and <br />abundant in mainstem rivers (Jordan and Evermann 1896), its populations have been greatly <br />reduced. The fish is presently represented in the wild by a low number of old adult fish in Lake <br />Mohave and perhaps other lower basin reservoirs (USFWS 1990a). The last known riverine area <br />where bonytail were common was the Green River in Dinosaur National Monument, where <br />Vanicek (1967) and Holden and Stalnaker (1970) collected 91 specimens during 1962 -1966. <br />From 1977 to 1983, no bonytail were collected from the Colorado or Gtuutison rivers in <br />Colorado or Utah (Wick et al. 1979, 1981; Valdez et al. 1982b; Miller et al. 1984). However, in <br />1984, a single bonytail vas collected from Black Rocks on the Colorado River (Kaeding et al. <br />1986). Several suspected bonytail were captured in Catazact Canyon in 1985 - 1987 (Valdez <br />1990). <br />• The bonytail is considered a species that is adapted to mainstem rivers, where it has been <br />observed in pools and eddies (Vanicek 1967; Minckley 1973). Spawning of bonytail has never <br />been observed in a river, but ripe fish were collected in Dinosaur National Monument during late <br />June and eazly July suggesting that spawning occurred at water temperatures of about 64° F <br />(Vanicek and Kramer 1969). <br />Critical Habitat <br />Critical habitat has been designated within the bonytail's historical range in the following <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 Counri. 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 />boundary of Dinosaur National Monument in T. 6 N., R. 24 E., section 30 (Salt Lake <br />Meridian). <br />Utah. Uintah and Grand Counties. The Green River (Desolation and Gray Canyons) from <br />Stunner's Amphitheater (river mile 8~) in T. 12 S., R. 18 E., section 5 (Salt Lake Meridian) <br />to Swasey's Rapid (river mile 12) in T. 20 S., R. 16 E., section 3 (Salt Lake Meridian). <br />