Region
United States
123
Colorado
82
Texas
55
California
51
Wyoming
49
Montana
43
Washington (State)
43
New York (State)
42
Alaska
41
Florida
40
Illinois
39
Idaho
38
North Carolina
38
Massachusetts
37
South Carolina
35
New Mexico
34
Arizona
33
Kansas
31
Ohio
31
Pennsylvania
31
Minnesota
30
Mississippi River
29
Wisconsin
29
Georgia
28
Tennessee
27
Indiana
26
Oregon
26
Maine
24
Maryland
24
Oklahoma
24
Virginia
24
Arkansas
22
Hawaii
22
Utah
21
West Virginia
21
Alabama
20
Colorado River Watershed (Colo.-Mexico)
20
South Dakota
19
Iowa
18
Kentucky
18
Missouri
18
New Jersey
18
Colorado River (Colo.-Mexico)
16
Mississippi
15
Missouri River Watershed
15
Louisiana
14
Michigan
14
Nevada
14
Mississippi River Watershed
13
Puerto Rico
13
more ...