Specimen ID | State | County | Locality | Year |
| Drainage name | Status |
230900
| MD | Montgomery | Chesapeake and Ohio Canal, Violettes Lock, near Seneca | 1982 |
02070008
| Middle Potomac-Catoctin | established |
892666
| MD | Montgomery | Clopper Lake, at Seneca Creek State Park; at boat ramp and throughout | 2015 |
02070008
| Middle Potomac-Catoctin | established |
1409967
| MD | Montgomery | Seneca Creek State Park | 2016 |
02070008
| Middle Potomac-Catoctin | established |