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_• <br /> <br />12 <br />surveys since 1988 have documented razorback suckers .in riverside ponds as far <br />upstream as river mile 235 near Rifle, Colorado (Burdick 1992). <br />Humpback Chub <br />Humpback chub generally do not make migrational movements in the upper <br />Colorado River and tend to reside throughout the year within a limited reach <br />of river. Humpback chub are found inhabiting narrow, deep canyon areas and <br />are relatively restricted in distribution. They seldom leave their canyon <br />habitat (U.S. Fish and Wildlife Service 1982). While humpback chub are <br />regularly found dispersed in the Green and Yampa Rivers, the only major <br />populations of humpback chub known to exist in the Upper Basin are located in <br />Black Rocks and Westwater Canyons on the Colorado River. <br />Critical Habitat <br />Critical habitat has been designated within the humpback chub's historical <br />range in the following sections of the Upper Basin (59 F.R. 13374). <br />Colorado. Moffat County. The Yampa River from the boundary of Dinosaur <br />National Monument in T. 6 N., R. 99 W., section 27 (6th Principal <br />Meridian) to the confluence with the Green River in T. 7 N., R. 103 W., <br />section 28 (6th Principal Meridian). <br />Utah Uintah Countv: and Colorado. Moffat Countv. The Green River from <br />the confluence with the Yampa River in T. 7 N., R. 103 W., section 28 <br />(6th Principal Meridian) to the southern boundary of Dinosaur National <br />Monument in T. 6 N., R. 24 E., section 30 (Salt Lake Meridian). <br />Utah. Uintah and Grand Counties. The Green River (Desolation and Gray <br />Canyons) from Sumners Amphitheater in T. 12 S., R. 18 E., section 5 <br />(Salt Lake Meridian) to Swasey's Rapid in T. 20 S., R. 16 E., section 3 <br />(Salt Lake Meridian). <br />Utah. Grand Countv; and Colorado. Mesa Countv. The Colorado River from <br />Black Rocks in T. 10 S., R. 104 W., section 25 (6th Principal Meridian) <br />to Fish Ford in T. 21 S., R. 24 E., section 35 (Salt Lake Meridian). <br />