Region
United States
23
Colorado
15
California
10
Alaska
9
Washington (State)
9
Oregon
7
Wyoming
6
Arizona
5
Illinois
5
West (U.S.)
5
Idaho
4
Iowa
4
Missouri
4
Montana
4
Baranof Island
3
China
3
Colorado River (Colo.-Mexico)
3
Hoover Dam (Ariz. and Nev.)
3
Mississippi River
3
Puerto Rico
3
Snake River (Wyo.-Wash.)
3
Clarksville
2
Colorado River Watershed (Colo.-Mexico)
2
Columbia River
2
Des Plaines River (Wis. and Ill.)
2
Flathead River (B.C. and Mont.)
2
Fontenelle Dam (Wyo.)
2
Glen Canyon Dam (Ariz.)
2
Kaskaskia River
2
Klamath River (Or. and Calif.)
2
La Crescent
2
Minnesota
2
Nevada
2
New York (State)
2
Nile River Watershed
2
North Platte River
2
Orocovis
2
Pennsylvania
2
Red Rock Dam (Iowa)
2
Shasta
2
Snake River Watershed (Wyo.-Wash.)
2
Utah
2
Yangtze River Gorges
2
Alabama
1
Allegheny River (Pa. and N.Y.)
1
American Falls Dam (Idaho)
1
Arkansas River
1
Asia
1
Big Thompson River Valley
1
Blaine County
1
more ...