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. .. . ,MAY-15-199S 15:47 BOR LVLND 9706633212 P.06/24 5 composition have occurred due to the introduction of nonnative fishes, many of which have thrived as a result of changes in the natural riverine system (i.e., flow and temperature regimes). The decline of endemic Colorado River fishes seems to be at least partially related to competition or other behavioral interactions with nonnative species, which have perhaps been exacerbated by alterations in the natural fluvial environment. The Colorado squawfish currently occupies about 1,030 river miles in the Colorado River system (25 percent of its or.iginal range) and is presently found only in the Upper Basin above Glen Canyon Dam. It inhabits about 350 miles of the main stem Green River from its mouth to the mouth of the Vampa River. Its range also extends 160 miles up the Vampa River and 104 miles up the White River, the two major tributaries of the Green River. In the maIn stem Colorado River, it is currently found from lake Powell extending about 201 miles upstream to PalIsade, Colorado (Tyus et al. 1982), and in the lower 60 miles of the Gunnison River, a tributary to the main stem Colorado River (Burdick pers. comm. 1995) Critical Habitat Critical habitat has been designated within the 100-year floodplain of the Colorado squawfish's historical range in the follOWing sections of the Upper Basin (59 F.R. 13374). The section of critical habitat which will be affected by this project is preceded by an asterisk (*). Colorado. Moffat Countv. The Vampa River and its 100-year floodplain from the State Highway 394 bridge in T. 6 N., R. 91 W., section 1 (6th Principal Meridian) to the confluence with the Green River in T. 7 N., R. 103 W., section 28 (6th Principal Meridian). Utah. Uintah. Carbon. Grand. Emerv. Wavne. and San Juan Counties: and Colorado. Moffat Countv. The Green River and its 100-year floodplain from the confluence with the Vampa River in T. 7 N., R. 103 W., section 28 (6th Principal Meridian) to the confluence with the Colorado River in T. 30 S., R. 19 E., section 7 (Salt lake Meridian). Colorado. Rio Blanco Countv: and Utah. Uintah CQuntv. The White River and its 100-year floodplain from Rio Blanco lake Dam in T. 1 N., R. 96 W., section 6 (6th Principal Meridian) to the, confluence with the Green River in T. 9 S., R. ZO E., section 4 (Salt lake Meridian). Colorado. Delta and Mesa Counties. The Gunnison River and its 100-year floodplain from the confluence with the Uncompahgre River in T. 15 S., R. 96 W., section 11 (6th Principal Meridian) to the confluence with the Colorado River in T. 1 S., R. 1 W., section 22 (Ute Meridian). M a nd arfiel Cou . an Utah n n rfie n . The Colorado River and its 100-year floodplain from the Colorado River Bridge at exit 90 north off Interstate 70 in T. 6 S., R. 93 W., section 16 (6th Principal Meridian) to North Wash, including the Dirty Devil arm of lake Powell up to the full pool elevation, in T. 33 S., R. 14 E., section Z9 (Salt lake Meridian).