Region
United States
122
Colorado
80
Washington (State)
76
Arizona
62
California
59
Glen Canyon Dam (Ariz.)
45
Oregon
43
Idaho
33
Colorado River (Colo.-Mexico)
31
Grand Coulee Dam (Wash.)
26
Hoover Dam (Ariz. and Nev.)
26
Utah
20
West (U.S.)
20
Montana
18
Teton Dam (Idaho)
18
Folsom Dam (Calif.)
16
New Mexico
16
Snake River (Wyo.-Wash.)
16
Alaska
15
Chief Joseph Dam (Wash.)
15
North Dakota
14
Wyoming
13
Glen Canyon Dam
12
Chief Joseph Dam
10
Columbia River Watershed
10
Iowa
10
Mississippi River
10
Missouri
10
Nevada
10
Pennsylvania
10
Spokane Tribe of the Spokane Reservation
9
Columbia River
8
Elwha River
8
Grand Canyon
8
Lower Columbia River (Or. and Wash.)
8
Powell, Lake (Utah and Ariz.)
8
C.C. Cragin Dam (Ariz.)
7
C.C. Cragin Reservoir (Ariz.)
7
China
7
Elwha River (Wash.)
7
Illinois
7
Cochiti Dam (N.M.)
6
Kansas
6
Michigan
6
Arrowrock Dam (Idaho)
5
Colorado River Watershed (Colo.-Mexico)
5
Glen Canyon (Utah and Ariz.)
5
McNary Lock and Dam (Or.)
5
Puerto Rico
5
Snake River Watershed (Wyo.-Wash.)
5
more ...