Region
Texas
13
Colorado
10
Maine
9
Oklahoma
9
Virginia
9
Oregon
8
Montana
7
Massachusetts
6
New York (State)
6
West Virginia
6
Arizona
5
Illinois
5
Indiana
5
Iowa
5
Kansas
5
Missouri
5
Alabama
4
Alaska
4
Florida
4
Idaho
4
Washington (State)
4
Wyoming
4
Arkansas River
3
California
3
Connecticut
3
Hawaii
3
Maryland
3
Minnesota
3
Missouri River
3
Nebraska
3
Ohio
3
Pennsylvania
3
Puerto Rico
3
Skagit River (B.C. and Wash.)
3
South Carolina
3
United States
3
Arkansas
2
Brazos River
2
Canada
2
Chesapeake Bay Watershed
2
Fortymile River (Alaska and Yukon)
2
Fortymile River Watershed (Alaska and Yukon)
2
Guadalupe River Watershed
2
Gunnison River
2
Kansas City
2
Kentucky
2
Nevada
2
New Jersey
2
New Mexico
2
Shenandoah River (Va. and W. Va.)
2
more ...