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Region
- United States44
- Colorado River (Colo.-Mexico)23
- Colorado River Watershed (Colo.-Mexico)18
- Colorado14
- OregonUpper Klamath Lake11
- Arizona10
- Klamath River (Or. and Calif.)8
- Red River of the North Watershed8
- Washington (State)Yakima River Watershed8
- Nevada7
- North Dakota7
- Klamath River Watershed (Or. and Calif.)6
- South Dakota6
- California5
- Hoover Dam (Ariz. and Nev.)5
- Montana5
- West (U.S.)5
- ArizonaGrand Canyon National Park4
- CaliforniaSan Joaquin Valley4
- ColoradoGunnison River Watershed4