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MOVEMENT/MIGRATION ............................. 30 BONYTAIL ..........................................30 HISTORIC DISTRIBUTION AND ABUNDANCE ............... 31 CURRENT DISTRIBUTION AND ABUNDANCE ............... 33 STATUS .........................................34 HABITAT REQUIREMENTS ............................ 34 Riverine ....................................... 34 Reservoir ......................................35 Hatchery .......................................35 CRITICAL HABITAT ......................................... 36 DEFINITION OF CRITICAL HABITAT ........................... 36 ROLE OF CRITICAL HABITAT IN SPECIES CONSERVATION ........... 37 PRIMARY CONSTITUENT ELEMENTS .......................... 38 ADDITIONAL SELECTION CRITERIA FOR THE RAZORBACK SUCKER .... 39 RESULTS OF APPLYING PRIMARY CONSTITUENT ELEMENTS AND SELECTION CRITERIA .................................. 40 RAZORBACK SUCKER .................................. 41 CRITICAL HABITAT DESIGNATION BY AREA ............... 44 Yampa River - Lily Park to Green River Confluence ............ 44 Green River - Confluence with the Yampa to Sand Wash ......... 48 Green River - Sand Wash to Confluence with the Colorado River .... 52 White River - Lower 18 Miles ......................... 54 Duchesne River - Lower 2.5 Miles ....................... 57 Gunnison River - Confluence with the Uncompahgre River to the Redlands Diversion Dam .......................... 59 Colorado River - Rifle, Colorado to Westwater ............... 63 Colorado River - Westwater to the Dirty Devil Arm of Lake Powell .. 66 San Juan River - Hogback Diversion to Neskahai Canyon ........ 69 Colorado River - Paria River to Hoover Dam ................ 72 Colorado River - Hoover Dam to Davis Dam (Lake Mohave) ...... 77 Colorado River - Parker Dam to Imperial Dam ............... 81 Gila River - Arizona-New Mexico Border to Coolidge Dam ....... 87 Salt River - US60/SR77 Bridge to Roosevelt Diversion Dam ....... 92 Verde River - Dam at Sullivan Lake to Horseshoe Dam .......... 96 COLORADO SQUAWFISH ............................... 101 CRITICAL HABITAT DESIGNATION BY AREA .............. 103 Yampa River - Craig, Colorado, to Green River Confluence ...... 103 Green River - Confluence with the Yampa to Confluence with the Colorado River ............................... 107 White River - Rio Blanco Reservoir to Green River ........... 110 Gunnison River - Confluence with the Uncompahgre River to the Gunnison River Mouth .......................... 112 iii