Region
United States
105
West (U.S.)
33
Colorado River Watershed (Colo.-Mexico)
8
California
5
Colorado
4
Central Valley
1
Cheyenne
1
Colorado River (Colo.-Mexico)
1
Denver
1
Great Plains
1
Klamath River Watershed (Or. and Calif.)
1
Lower Rio Grande Valley
1
Lower Rio Grande Valley (Tex.)
1
Montana
1
Natrona County
1
Pacific States
1
Sacramento County
1
San Juan River Watershed (Colo.-Utah)
1
Texas
1
Wyoming
1