Region
California
5
Montana
5
Nevada
4
Wyoming
4
Arizona
2
Churchill County
2
Colorado
2
Florida
2
Idaho
2
New Mexico
2
Salton Sea (Calif.)
2
South Dakota
2
United States
2
Utah
2
Washington (State)
2
American Falls
1
American Falls Reservoir (Idaho)
1
Arkansas
1
Benton Lake National Wildlife Refuge (Mont.)
1
Bosque del Apache National Wildlife Refuge
1
Bowdoin National Wildlife Refuge (Mont.)
1
California, Southern
1
Carson Sink
1
Central Valley
1
Colorado River (Colo.-Mexico)
1
Columbia Plateau
1
Columbia River
1
Delta (Region)
1
Dolores
1
East (U.S.)
1
Freezeout Lake
1
Freezout Lake Wildlife Management Area (Mont.)
1
Hawaii
1
High Plains (U.S.)
1
High Plains Aquifer
1
Imperial Valley (Calif. and Mexico)
1
Kansas
1
Kauai
1
Laguna Atascosa National Wildlife Refuge
1
Lower Rio Grande Valley
1
Malheur County
1
Milk River Watershed (Mont. and Alta.)
1
Minnesota
1
Mississippi
1
Mississippi Embayment
1
Natrona County
1
Oregon
1
Owyhee County
1
Palo Verde Valley
1
Palo Verde Valley (Calif.)
1
more ...