Region
United States
591
Colorado
53
Pennsylvania
41
Massachusetts
39
Illinois
32
New York (State)
24
Clark Fork Watershed (Mont. and Idaho)
22
New Jersey
21
California
18
Tennessee
18
Montana
15
Florida
14
Minnesota
12
Utah
12
Idaho
11
Alaska
10
Connecticut
10
Michigan
10
Ohio
10
Wisconsin
10
Belvidere
9
Bucks County
9
Maine
9
Kentucky
8
Maryland
8
New Hampshire
8
Oklahoma
8
Coeur d'Alene River Watershed
7
Middle Atlantic States
7
Missouri
7
Texas
7
Washington (State)
7
Alamosa River Watershed
6
Great Lakes (North America)
6
Indiana
6
Kansas
6
Louisiana
6
Arkansas
5
Calumet Region (Ill. and Ind.)
5
Charles River
5
Chesapeake Bay Watershed
5
Clark Fork (Mont. and Idaho)
5
Mexico, Gulf of
5
Mississippi
5
Oregon
5
Spokane River Watershed (Idaho and Wash.)
5
Vermont
5
Virginia
5
Adams County
4
Ashland
4
more ...