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11 <br />Utah, Uintah County: and Colorado, Moffat Countv. The Green River from <br />the confluence with the Yampa River in T. 1 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 (river mile 85) in T. 12 S., <br />R. 18 E., section 5 (Salt Lake Meridian) to Swasey's Rapid (river <br />mile 12) in T. 20 S., R. 16 E., section 3 (Salt Lake Meridian). <br />Utah. Grand Countv: and Colorado. Mesa Countv. The Colorado River from <br />Black Rocks (river mile 137) in T. 10 S., R. 104 W., section 25 <br />(6th Principal Meridian) to Fish Ford (river mile 106) in T. 21 S., <br />R. 24 E., section 35 (Salt Lake Meridian). <br />Utah Garfield and San Juan Counties. The Colorado River from Brown <br />Betty Rapid (river mile 212.5) in T. 30 S., R. 18 E., section 34 (Salt <br />Lake Meridian) to Imperial Canyon (river mile 200) in T. 31 S., <br />R. 17 E., section 28 (Salt Lake Meridian). <br />Bonytail Chub <br />Little is known about the biological requirements of the bonytail chub, as the <br />species has drastically declined in numbers in the Upper Basin shortly after <br />1960. Until recently, the Service considered the species extirpated from the <br />Upper Basin; however, a recently collected specimen which exhibits many <br />bonytail characteristics could indicate a small, extant population. It is <br />thought that, should this species persist in the Colorado River, the preferred <br />habitat would be in the larger river reaches. <br />Critical Habitat <br />Critical habitat has been proposed within the bonytail chub's historical range <br />in the following sections of the Upper Basin (58 F.R. 6578). <br />Colorado, Moffat Countv. 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 County: 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 boundary of Dinosaur National Monument <br />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 Sumner's.Amphitheater (river mile 85) in T: .12 S., <br />R. 18 E.,.section 5 (Salt Lake Meridian) .to Swasey's Rapid (river <br />mile 12) in T. 20 S., R. 16 E., section 3 (Salt Lake Meridian). <br />