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29 <br />The bonytail is considered a species that is adapted to mainstem rivers, where <br />it has been observed in pools and eddies (Vanicek 1967, Minckley 1973). <br />Spawning of bonytail has never been observed in a river, but ripe fish were <br />collected in Dinosaur National Monument during late June and early July <br />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 <br />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 County: and Colorado. Moffat County. 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 in <br />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 in T. 12 S., R. 18 E., section 5 (Salt <br />Lake Meridian) to Swasey's Rapid (river mile 12) in T. 20 S., R. 16 E., <br />section 3 (Salt Lake Meridian). <br />Utah. Grand County; and Colorado. Mesa County. 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 in T. 21 S., R. 24 E., section 35 <br />(Salt Lake Meridian). <br />Utah. Garfield and San Juan Counties. The Colorado River from Brown Betty <br />Rapid in T. 30 S., R. 18 E., section 34 (Salt Lake Meridian) to Imperial <br />Canyon in T. 31 S., R. 17 E., section 28 (Salt Lake Meridian). <br />Environmental Baseline <br />Consistent with the regulatory definition found at 50 CFR 402.02, the <br />environmental baseline includes the past and present impacts of all Federal, <br />State, or private actions and other human activities in the action area (the <br />Duchesne River Basin), the anticipated impacts of all proposed Federal <br />projects in the action area that have already undergone formal or early <br />