Specimen ID | State | County | Locality | Year |
| Drainage name | Status |
1655046
| MD | Baltimore | Baltimore County, MD, USA | 2020 |
02060003
| Gunpowder-Patapsco | established |
1428121
| MD | Baltimore | Bird River | 2017 |
02060003
| Gunpowder-Patapsco | established |
1428102
| MD | Baltimore | Bird River | 2017 |
02060003
| Gunpowder-Patapsco | established |
1428114
| MD | Baltimore | Bird River | 2017 |
02060003
| Gunpowder-Patapsco | established |
1428109
| MD | Baltimore | Bird River | 2017 |
02060003
| Gunpowder-Patapsco | established |
1428122
| MD | Baltimore | Bird River | 2017 |
02060003
| Gunpowder-Patapsco | established |
892665
| MD | Baltimore | Loch Raven Reservoir, in cove | 2015 |
02060003
| Gunpowder-Patapsco | established |
1654940
| MD | Baltimore | Saltpeter Creek, Baltimore, MD, US | 2019 |
02060003
| Gunpowder-Patapsco | established |
233803
| MD | Baltimore/Harfor | Gunpowder River | 2000 |
02060003
| Gunpowder-Patapsco | established |
232111
| MD | Baltimore-Harfor | tidal tributaries of the Gunpowder-Patapsco watershed | 2000 |
02060003
| Gunpowder-Patapsco | established |
1654897
| MD | Carroll | Eldersburg, MD, USA | 2018 |
02060003
| Gunpowder-Patapsco | established |
232121
| MD | Carroll | Piney Run Reservoir | 1998 |
02060003
| Gunpowder-Patapsco | established |
232340
| MD | Harford | Bush River | 1996 |
02060003
| Gunpowder-Patapsco | established |
232112
| MD | Harford | Bush River | 2000 |
02060003
| Gunpowder-Patapsco | established |
229839
| MD | Harford | Concord Point, Havre de Grace, area of Sesquehanna Flats, underwater deltaic system of the Sesquehanna River, head of the Chesapeake Bay | 1990 |
02060003
| Gunpowder-Patapsco | established |