Specimen ID | State | County | Locality | Year |
| Drainage name | Status |
746146
| 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 | established |
1671916
| MD | Frederick | [No locality description provided] | 2018 |
02070008
| Middle Potomac-Catoctin | |
1677690
| MD | Montgomery | [No locality description provided] | 2017 |
02070008
| Middle Potomac-Catoctin | |
1673171
| MD | Montgomery | [No locality description provided] | 2019 |
02070008
| Middle Potomac-Catoctin | |
1679034
| MD | Montgomery | [No locality description provided] | 2020 |
02070008
| Middle Potomac-Catoctin | |
1655049
| MD | Montgomery | BBRd | 2020 |
02070008
| Middle Potomac-Catoctin | established |
1655047
| MD | Montgomery | Montgomery County, MD, USA | 2019 |
02070008
| Middle Potomac-Catoctin | established |
746233
| 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 | established |
280460
| MD | Montgomery | Potomac River, in the vicinity of Plummers Island (including C&O canal). | 1995 |
02070008
| Middle Potomac-Catoctin | established |
611317
| MD | Montgomery | Potomac River, Plummer's Island, 0.25 miles below I-495, SW of Bethesda | 1995 |
02070008
| Middle Potomac-Catoctin | established |
280461
| 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 |
153249
| VA | | middle Potomac-Catoctin drainage | 1994 |
02070008
| Middle Potomac-Catoctin | established |
1674602
| VA | Fairfax | [No locality description provided] | 2020 |
02070008
| Middle Potomac-Catoctin | |
611618
| VA | Fairfax | Difficult Run at Leigh Mill Road, about 2.0 air miles SE town of Great Falls | 1995 |
02070008
| Middle Potomac-Catoctin | established |
1654849
| VA | Fairfax | Fairfax County, VA, USA | 2020 |
02070008
| Middle Potomac-Catoctin | established |
746068
| VA | Fairfax | Little Difficult Run by Stuart Mill Road, ca. 1.4 road miles E off Fox Mill Road, 4.1 air miles WNW center of Vienna | 2010 |
02070008
| Middle Potomac-Catoctin | established |
280465
| VA | Fairfax | Little Difficult Run by Stuart Mill Road, ca. 1.4 road miles E off Fox Mill Road, 4.1 air miles WNW center of Vienna | 2010 |
02070008
| Middle Potomac-Catoctin | established |
746148
| VA | Fairfax | Wolf Trap Creek by Rosewood Hill Drive, just N of Browns Mill Road, 3.8 air miles NNW center of Vienna | 2010 |
02070008
| Middle Potomac-Catoctin | established |
280466
| VA | Fairfax | Wolf Trap Creek by Rosewood Hill Drive, just N of Browns Mill Road, 3.8 air miles NNW center of Vienna. | 2010 |
02070008
| Middle Potomac-Catoctin | established |
1675651
| VA | Loudoun | [No locality description provided] | 2020 |
02070008
| Middle Potomac-Catoctin | |