Specimen ID | State | County | Locality | Year |
| Drainage name | Status |
157609
| MD | | Potomac River near District of Columbia | 1999 |
02070010
| Middle Potomac-Anacostia-Occoquan | extirpated |
35177
| MD | | state non-specific | 1888 |
02000000
| Mid Atlantic Region | unknown |
35094
| MD | | state non-specific | 1896 |
02000000
| Mid Atlantic Region | established |
35039
| MD | | state non-specific | 1984 |
02000000
| Mid Atlantic Region | collected |
268179
| MD | | Upper Chesapeake (HUC6) non-specific | 1981 |
02060000
| Upper Chesapeake | collected |
35090
| MD | Baltimore | Druid Hills Park | 1874 |
02060003
| Gunpowder-Patapsco | collected |
278655
| MD | Baltimore | Druid Hills Park | 1929 |
02060003
| Gunpowder-Patapsco | established |
35172
| MD | Frederick | Monocacy River near Frederick Junction | 1888 |
02070009
| Monocacy | failed |
35176
| MD | Garrett | Youghiogheny River at Oakland | 1888 |
05020006
| Youghiogheny | unknown |
35175
| MD | Harford | Deer Creek at Bel Air (Bel Air not on Deer Creek) | 1888 |
02050306
| Lower Susquehanna | failed |
35173
| MD | Howard-Prince George's | Patuxent River at Laurel | 1888 |
02060006
| Patuxent | failed |
35174
| MD | Washington | Big Pool at Hagerstown | 1888 |
02070004
| Conococheague-Opequon | failed |