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18 <br />Utah. Uintah. Carbon. Grand. Emery. Wayne. and San Juan Counties: and <br />Colorado. Moffat County. The Green River and its 100-year floodplain from <br />the confluence with the Yampa River in T. 7 N., R. 103 W., section 28 (6th <br />Principal Meridian) to the confluence with the Colorado River in T. 30 S., <br />R. 19 E., section 7 (Salt Lake Meridian). <br />Colorado Rio Blanco County and Utah Uintah County. The White River and <br />its 100-year floodplain from Rio Blanco Lake Dam in T. 1 N., R. 96 W., <br />section 6 (6th Principal Meridian) to the confluence with the Green River <br />in T. 9 S., R. 20 E., section 4 (Salt Lake Meridian). <br />Colorado. Delta and Mesa Counties. The Gunnison River and its 100-year <br />floodplain from the confluence with the Uncompahgre River in T. 15 S., <br />R. 96 W., section 11 (6th Principal Meridian) to the confluence with the <br />Colorado River in T. 1 S., R. 1 W., section 22 (Ute Meridian). <br />Colorado Mesa and Garfield Counties• and Utah Grand. San Juan. Wayne. <br />and Garfield Counties. The Colorado River and its 100-year floodplain <br />from the Colorado River Bridge at exit 90 north off Interstate 70 in <br />T. 6 S., R. 93 W., section 16 (6th Principal Meridian) to North Wash, <br />including the Dirty Devil arm of Lake Powell up to the full pool <br />elevation, in T. 33 S., R. 14 E., section 29 (Salt Lake Meridian). <br />NPw Mexico San Juan County and Utah San Juan County. The San Juan <br />River and its 100-year floodplain from the State Route 371 Bridge in <br />T. 29 N., R. 13 W., section 17 (New Mexico Meridian) to Neskahai Canyon in <br />the San-Juan arm of Lake Powell in T. 41 S., R. 11 E., section 26 <br />(Salt Lake Meridian) up to the full pool elevation. <br />The life history phases apparently most criticaly associated with the <br />endangered status of the Colorado squawfish include spawning, egg <br />fertilization, and development of larvae through the first year of life. <br />These phases of Colorado squawfish development are tied closely to specific <br />habitat requirements. Natural spawning of Colorado squawfish is initiated on <br />the descending limb of the annual hydrograph as water temperatures approach <br />20°C. Spawning, both in the hatchery and in the wild, generally occurs in an <br />approximate 2-month time frame between July 1 and September 1, although high <br />flow water years may suppress river temperatures and extend spawning in the <br />natural system into September. Conversely, during l:ow flow years when the <br />water warms earlier, spawning may occur as early as~June. <br />