Region
United States
51
Colorado
17
Oregon
12
Washington (State)
12
California
6
Canada
4
Columbia River
4
Columbia River Watershed
4
Northwest, Pacific
4
Alaska
3
Lewis River Watershed
3
Lewis River Watershed (Wash.)
3
Nebraska
3
New Mexico
3
North Dakota
3
Snake River (Wyo.-Wash.)
3
Southern States
3
West (U.S.)
3
Arctic regions
2
Entiat River Watershed
2
Entiat River Watershed (Wash.)
2
Florida
2
Hawaii
2
Klamath River Watershed (Or. and Calif.)
2
Mexico
2
Michigan
2
Montana
2
Montana, Western
2
New York (State)
2
North America
2
Utah
2
Virginia
2
West Virginia
2
Willamette River Valley
2
Willapa National Wildlife Refuge
2
Willapa National Wildlife Refuge (Wash.)
2
Antioch Dunes (Calif.)
1
Arizona
1
Arrowwood National Wildlife Refuge
1
Arrowwood National Wildlife Refuge (N.D.)
1
Ash Meadows National Wildlife Refuge (Nev.)
1
Atlantic Ocean
1
Bayou Cocodrie National Wildlife Refuge (La.)
1
Bear River Migratory Bird Refuge (Utah)
1
Belly River Region (Mont. and Alta.)
1
Biscayne Bay
1
Canaan Valley National Wildlife Refuge
1
Canaan Valley National Wildlife Refuge (W. Va.)
1
Cape May Region
1
Cape May Region (N.J.)
1
more ...