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Colorado River - Rifle, Colorado to the Dirty Devil Arm of Lake Powell .................................... 114 San Juan River - Farmington to Neskahai Canyon ............. 117 HUMPBACK CHUB .................................... 120 CRITICAL HABITAT DESIGNATION BY AREA .............. 120 Yampa River - Dinosaur National Monument ............... 120 Green River - Dinosaur National Monument ................ 125 Green River - Desolation and Gray Canyons, Utah ............ 127 Colorado River - Black Rocks/Westwater Canyon ............. 129 Colorado River - Cataract Canyon, Utah .................. 130 Little Colorado River .............................. 132 Colorado River - Marble and Grand Canyons ............... 135 BONYTAIL ......................................... 138 CRITICAL HABITAT DESIGNATION BY AREA .............. 142 Yampa River - Dinosaur National Monument ............... 142 Green River - Dinosaur National Monument ................ 143 Green River - Desolation and Gray Canyons, Utah ............ 145 Colorado River - Black Rocks/Westwater Canyon ............. 147 Colorado River - Cataract Canyon, Utah .................. 148 Colorado River - Hoover Dam to Parker Dam (Lakes Mohave and Havasu) .................................... 150 SUMMARY OF PROPOSED CRITICAL HABITAT DESIGNATION ..... 154 RIVER MANAGEMENT PRACTICES AND PROBLEMS ............ 157 BARRIERS.. ................................... 157 WATER MANAGEMENT ............................. 159 Water Depletions and Releases ........................ 161 Power Marketing ................................. 163 Water Marketing ................................. 166 WATER TEMPERATURE AND SEDIMENT TRANSPORT ........ 167 CONTAMINANTS .................................. 168 Green River Contaminants ........................... 168 Upper Colorado River Basin Contaminants ................. 169 San Juan River Contaminants ......................... 170 Gila River Contaminants ............................ 171 Salt River Contaminants ............................ 171 Verde River Contaminants ........................... 172 Lower Colorado River Contaminants ..................... 172 MINING ........................................... 173 CHANNELIZATION AND LOSS OF BOTTOMLANDS ............. 174 FISH REMOVAL PROJECTS .............................. 175 NONNATIVE FISHES .................................. 177 RECREATION ....................................... 181 ONGOING RECOVERY EFFORTS .......................... 183 UPPER BASIN .................................... 183 iv