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Region
- Kentucky4
- Alaska3
- Georgia3
- Idaho3
- New England3
- Texas3
- Colorado River Watershed (Colo.-Mexico)2
- Indiana2
- Maine2
- Missouri River Watershed2
- New JerseyRaritan River Watershed2
- Savannah River Watershed (Ga. and S.C.)2
- South Dakota2
- West Virginia2
- Wisconsin2
- Baker River Watershed (Wash.)1
- Big Sioux River (S.D. and Iowa)1
- Big Sioux River Valley (S.D. and Iowa)1
- Canada1
- Chesapeake Bay (Md. and Va.)1