Region
Colorado
7
South Dakota
5
California
4
Idaho
4
Washington (State)
4
Wyoming
4
Oregon
3
Rio Grande Valley (Colo.-Mexico and Tex.)
3
Salton Sea (Calif.)
3
American Falls
2
Bowdoin National Wildlife Refuge (Mont.)
2
Columbia River
2
Green River Valley (Wyo.-Utah)
2
Imperial Valley (Calif. and Mexico)
2
Laguna Atascosa National Wildlife Refuge
2
Malheur County
2
Milk River Watershed (Mont. and Alta.)
2
Natrona County
2
New Mexico
2
Owyhee County
2
Salton Sea
2
Snake River Plain (Idaho and Or.)
2
Texas
2
American Falls Reservoir (Idaho)
1
Bosque del Apache National Wildlife Refuge
1
Cache la Poudre River Watershed
1
California, Southern
1
Churchill County
1
Dolores
1
Dolores Region
1
Grand Valley (Colo. and Utah)
1
Lower Rio Grande Valley
1
Milk River (Mont. and Alta.)
1
Montana
1
Nevada
1
Salton Sea Region
1
Salton Sea Region (Calif.)
1
Sonny Bono Salton Sea National Wildlife Refuge
1
Sun River Region
1
Tulare Lake
1
Tulare Lake (Calif.)
1
West (U.S.)
1