Lower Potomac HUC8 02070011
A 4,677 km² sub-basin of the Mid-Atlantic region in MD, VA. Drought coverage is from the US Drought Monitor (map of 2026-09-01); streamflow classes place each USGS gauge's latest reading against its own day-of-year record.
Health score
72
Moderate
Drought index
100
Moderate
Area in D2+
0%
0% exceptional (D4)
Gauges below normal
17%
of 6 reporting
Median flow
287%
p63 of record
Water assets
4,381
19 springs · 2,149 wells
USGS gauges (6)
- AQUIA CREEK NEAR GARRISONVILLE, VA016604000 cfsp14 · below normal
- S F QUANTICO CREEK NEAR INDEPENDENT HILL, VA016585000 cfsp43 · normal
- St Clements Creek near Clements, MD016610504 cfsp57 · normal
- ZEKIAH SWAMP RUN NEAR NEWTOWN, MD0166092033 cfsp68 · normal
- MATTAWOMAN CREEK NEAR POMONKEY, MD0165800018 cfsp79 · above normal
- St Marys River at Great Mills, MD0166150018 cfsp89 · above normal
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-09-07 | 100 | 0 | 1/6 | p63 |
Top water assets
- 66Breckinridge Damreservoir
- 66Gilbert Run Dam 3 (Jameson Dam)reservoir
- 66Lunga Damreservoir
- 66Gilbert Run Dam 2 (Wheatley)reservoir
- 66Gilbert Run Dam 1 (Trinity Church)reservoir
- 66St Marys River Watershed Site 1reservoir
- 66Breton Bay Golf And Country Club Damreservoir
- 65St Marys River At Great Mills, Mdriver
- 65Hideaway Pond Damreservoir
- 65Aquia Creek Near Garrisonville, Variver