Region
Colorado
64
Texas
45
Florida
39
Montana
33
United States
32
Arizona
30
Kansas
28
Colorado River (Colo.-Mexico)
27
California
26
Massachusetts
23
Oregon
23
Alaska
22
Maine
22
New York (State)
22
Washington (State)
22
Hawaii
21
North Carolina
21
Pennsylvania
21
New Mexico
19
Oklahoma
18
New Jersey
17
Iowa
16
Ohio
16
Virginia
16
Wyoming
16
Arkansas
15
Idaho
15
Minnesota
15
Colorado River Watershed (Colo.-Mexico)
13
Illinois
13
Wisconsin
12
Georgia
11
Indiana
11
Kentucky
11
Arkansas River
10
South Carolina
10
South Dakota
10
West Virginia
10
Columbia River Watershed
9
Connecticut
9
Delaware River Watershed (N.Y.-Del. and N.J.)
9
Mississippi River Watershed
9
North Dakota
9
Rhode Island
9
Snake River Watershed (Wyo.-Wash.)
9
Alabama
8
Atlantic Coast (U.S.)
8
Mexico, Gulf of
8
Nebraska
8
New England
8
more ...