Specimen ID | State | County | Locality | Year |
| Drainage name | Status |
746333
| DC | District of Columbia | Potomac River, 1.2 mile reach from 400 m above Chain Bridge Road to Fletchers Boathouse, W end of D.C. and Arlington | 2010 |
02070008
| Middle Potomac-Catoctin | unknown |
1673891
| MD | Montgomery | [No locality description provided] | 2012 |
02070008
| Middle Potomac-Catoctin | |
1671209
| MD | Montgomery | [No locality description provided] | 2013 |
02070008
| Middle Potomac-Catoctin | |
746334
| MD | Montgomery | Potomac River, 0.7 mile reach from E end of Swainsons Island upstream to head of Plummers Island and I-495 bridge, SW edge of Bethesda | 2010 |
02070008
| Middle Potomac-Catoctin | unknown |
549666
| MD | Montgomery | Potomac River, Plummer's Island, 0.25 miles below I-495, SW of Bethesda | 1995 |
02070008
| Middle Potomac-Catoctin | unknown |
280480
| MD | Montgomery | Potomac River, side channels on N side of Swainsons Island, ca. 0.5 miles downstream (E of) I-495 crossing, SW side of Bethesda | 2010 |
02070008
| Middle Potomac-Catoctin | established |
746350
| MD | Montgomery | Potomac River, side channels on N side of Swainsons Island, ca. 0.5 miles downstream (E of) I-495 crossing, SW side of Bethesda | 2010 |
02070008
| Middle Potomac-Catoctin | unknown |
746349
| MD | Montgomery | Potomac River, upstream and downstream ends of Plummers Island and Swainson Island area, just E of I-495 crossing, W side of Bethesda | 2010 |
02070008
| Middle Potomac-Catoctin | unknown |
280477
| MD | Montgomery | Potomac River, upstream and downstream ends of Plummers Island and Swainson Island area, just E of I-495 crossing, W side of Bethesda | 2010 |
02070008
| Middle Potomac-Catoctin | established |
45504
| VA | | middle Potomac-Catoctin system, from north of Washington DC to state line [location approximate hand plotted location] | 1994 |
02070008
| Middle Potomac-Catoctin | established |