Specimen ID | State | County | Locality | Year |
| Drainage name | Status |
1462330
| MD | | Potomac River at Washington DC | 1962 |
02070010
| Middle Potomac-Anacostia-Occoquan | established |
1462265
| MD | Harford | [Swan Creek, Chesapeake Bay] | 2013 |
02060003
| Gunpowder-Patapsco | established |
1462327
| MD | Montgomery | Potomac River at Chesapeake and Ohio canals, below the lock | 1962 |
02070008
| Middle Potomac-Catoctin | established |
1462329
| MD | Montgomery | Potomac River, at Great Falls | 1962 |
02070008
| Middle Potomac-Catoctin | established |