Region
United States
347
Colorado
22
New Jersey
8
Clark Fork Watershed (Mont. and Idaho)
7
Massachusetts
7
Pennsylvania
7
California
6
Idaho
6
New York (State)
6
Coeur d'Alene River Watershed
5
Oklahoma
5
Illinois
4
Maryland
4
Vermont
4
Wisconsin
4
Chesapeake Bay (Md. and Va.)
3
Chesapeake Bay Watershed
3
Connecticut
3
Maine
3
Michigan
3
Nevada
3
South Dakota
3
Denver
2
Florida
2
Great Lakes (North America)
2
Ipswich River Watershed
2
Kalamazoo River
2
Kansas
2
Kentucky
2
Louisiana
2
Mexican-American Border Region
2
Mexico, Gulf of
2
Middle Atlantic States
2
Montana
2
Naval Station Newport (R.I.)
2
Nebraska
2
New Hampshire
2
New Orleans
2
New Zealand
2
Oregon
2
Platte River
2
Spokane River Watershed (Idaho and Wash.)
2
Utah
2
Virginia
2
Yucca Mountain
2
Aberdeen Proving Ground
1
Alabama
1
Alaska
1
Androscoggin River (N.H. and Me.)
1
Animas River Watershed (Colo. and N.M.)
1
more ...