Middle Potomac-Catoctin HUC8 02070008
A 3,207 km² sub-basin of the Mid-Atlantic region in DC, MD, VA, WV. 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
71
Moderate
Drought index
152
Moderate
Area in D2+
0%
0% exceptional (D4)
Gauges below normal
13%
of 24 reporting
Median flow
84%
p39 of record
Water assets
4,028
72 springs · 1,608 wells
USGS gauges (26)
- TENMILE CREEK NEAR BOYDS, MD016443900 cfsp12 · below normal
- TENMILE CREEK NEAR CLARKSBURG, MD016443880 cfsp18 · below normal
- S F CATOCTIN CREEK AT RT 698 NEAR WATERFORD, VA016383501 cfsp25 · below normal
- DEAD RUN AT WHANN AVENUE NEAR MCLEAN, VA016463050 cfsp25 · normal
- LIMESTONE BRANCH NEAR LEESBURG, VA016435901 cfsp28 · normal
- LITTLE SENECA CREEK TRIBUTARY NEAR CLARKSBURG, MD016443710 cfsp28 · normal
- DIFFICULT RUN NEAR GREAT FALLS, VA0164600012 cfsp31 · normal
- DIFFICULT RUN ABOVE FOX LAKE NEAR FAIRFAX, VA016457042 cfsp32 · normal
- S F LITTLE DIFFICULT RUN ABOVE MOUTH NR VIENNA, VA016457620 cfsp34 · normal
- N F CATOCTIN CREEK AT RT 681 NEAR WATERFORD, VA016384201 cfsp36 · normal
- POTOMAC RIVER NEAR WASH, DC LITTLE FALLS PUMP STA016465001,980 cfsp37 · normal
- PINEY RUN NEAR LOVETTSVILLE, VA016366902 cfsp39 · normal
- LITTLE SENECA CREEK TRIBUTARY NEAR GERMANTOWN, MD016443751 cfsp39 · normal
- N F GOOSE CREEK AT RT 729 NEAR LINCOLN, VA016438053 cfsp43 · normal
- POTOMAC RIVER AT POINT OF ROCKS, MD016385002,280 cfsp46 · normal
- BEAVERDAM CREEK AT RT 734 NEAR MOUNTVILLE, VA016438802 cfsp51 · normal
- CABIN BRANCH NEAR BOYDS, MD016443800 cfsp52 · normal
- LITTLE SENECA CREEK TRIBUTARY AT BRINK, MD016443720 cfsp53 · normal
- CATOCTIN CREEK AT TAYLORSTOWN, VA0163848013 cfsp54 · normal
- SENECA CREEK AT DAWSONVILLE, MD0164500049 cfsp56 · normal
- GOOSE CREEK NEAR LEESBURG, VA0164400049 cfsp56 · normal
- CATOCTIN CREEK NEAR MIDDLETOWN, MD0163750012 cfsp58 · normal
- GOOSE CREEK NEAR MIDDLEBURG, VA0164370025 cfsp63 · normal
- BROAD RUN NEAR LEESBURG, VA0164428062 cfsp63 · normal
- SNAKEDEN BRANCH ABOVE LAKE AUDUBON AT RESTON, VA01645787340 cfsno long-term record
- THE GLADE NEAR HOWLAND DRIVE AT RESTON, VA01645795220 cfsno long-term record
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-09-07 | 152 | 0 | 3/24 | p39 |
Top water assets
- 66Lake Walker Dam - Pond 1 (Montgomery Village Avenue)reservoir
- 66Seneca State Park Dam (Seneca Creek Road)reservoir
- 66Little Seneca Damreservoir
- 66Lake Whetstone Dam (Montgomery Village Avenue)reservoir
- 66Lake Churchill (Wynnfield Drive)reservoir
- 66Great Falls Estate Damreservoir
- 66Inspiration Lakereservoir
- 65Fairfield East Damreservoir
- 65Lake Helene Damreservoir
- 65Manchester Farm Regional Swm Pond Damreservoir