Specimen ID | State | County | Locality | Year |
| Drainage name | Status |
280535
| MD | Charles | Potomac River, Mattawoman Creek tidal embayment, ca. 2.2 miles of lower reach from Smallwood State Park area upstream to above mouth of Marbury Run, 3.1-1.1 air miles SW-S center Indian Head | 2011 |
02070011
| Lower Potomac | established |
747002
| MD | Charles | Potomac River, Mattawoman Creek tidal embayment, ca. 2.2 miles of lower reach from Smallwood State Park area upstream to above mouth of Marbury Run, 3.1-1.1 air miles SW-S center Indian Head | 2011 |
02070011
| Lower Potomac | established |