Specimen ID | State | County | Locality | Year |
| Drainage name | Status |
1420939
| MD | Anne Arundel | Patapsco Valley State Park | 2004 |
02060003
| Gunpowder-Patapsco | established |
1420938
| MD | Anne Arundel | Patapsco Valley State Park | 2017 |
02060003
| Gunpowder-Patapsco | established |
1420940
| MD | Harford | Lower Big Gunpowder River, near Joppatown, MD | 2007 |
02060003
| Gunpowder-Patapsco | established |