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 2026-10-13); streamflow classes place each USGS gauge's latest reading against its own day-of-year record.
Health score
73
Moderate
Drought index
97
Abnormally dry
Area in D2+
0%
0% exceptional (D4)
Gauges below normal
13%
of 24 reporting
Median flow
130%
p55 of record
Water assets
4,028
72 springs · 1,608 wells
USGS gauges (26)
- LITTLE SENECA CREEK TRIBUTARY NEAR CLARKSBURG, MD016443710 cfsp9 · much below normal
- LITTLE SENECA CREEK TRIBUTARY NEAR GERMANTOWN, MD016443751 cfsp18 · below normal
- N F GOOSE CREEK AT RT 729 NEAR LINCOLN, VA016438055 cfsp24 · below normal
- LIMESTONE BRANCH NEAR LEESBURG, VA016435901 cfsp31 · normal
- PINEY RUN NEAR LOVETTSVILLE, VA016366902 cfsp33 · normal
- S F CATOCTIN CREEK AT RT 698 NEAR WATERFORD, VA016383504 cfsp39 · normal
- CATOCTIN CREEK NEAR MIDDLETOWN, MD0163750010 cfsp42 · normal
- DIFFICULT RUN ABOVE FOX LAKE NEAR FAIRFAX, VA016457042 cfsp46 · normal
- DEAD RUN AT WHANN AVENUE NEAR MCLEAN, VA016463050 cfsp50 · normal
- TENMILE CREEK NEAR BOYDS, MD016443901 cfsp53 · normal
- BEAVERDAM CREEK AT RT 734 NEAR MOUNTVILLE, VA016438809 cfsp54 · normal
- TENMILE CREEK NEAR CLARKSBURG, MD016443881 cfsp55 · normal
- CATOCTIN CREEK AT TAYLORSTOWN, VA0163848022 cfsp55 · normal
- SENECA CREEK AT DAWSONVILLE, MD0164500062 cfsp60 · normal
- GOOSE CREEK NEAR MIDDLEBURG, VA0164370046 cfsp61 · normal
- DIFFICULT RUN NEAR GREAT FALLS, VA0164600027 cfsp61 · normal
- N F CATOCTIN CREEK AT RT 681 NEAR WATERFORD, VA016384206 cfsp67 · normal
- LITTLE SENECA CREEK TRIBUTARY AT BRINK, MD016443720 cfsp69 · normal
- GOOSE CREEK NEAR LEESBURG, VA01644000126 cfsp72 · normal
- POTOMAC RIVER AT POINT OF ROCKS, MD016385003,770 cfsp75 · above normal
- POTOMAC RIVER NEAR WASH, DC LITTLE FALLS PUMP STA016465004,550 cfsp76 · above normal
- CABIN BRANCH NEAR BOYDS, MD016443801 cfsp78 · above normal
- S F LITTLE DIFFICULT RUN ABOVE MOUTH NR VIENNA, VA016457621 cfsp78 · above normal
- BROAD RUN NEAR LEESBURG, VA0164428064 cfsp84 · above 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 |
|---|---|---|---|---|
| 2026-10-22 | 97 | 0 | 3/24 | p55 |
| 2026-10-21 | 97 | 0 | 4/24 | p56 |
| 2026-10-20 | 97 | 0 | 2/24 | p60 |
| 2026-10-19 | 97 | 0 | 2/24 | p56 |
| 2026-10-18 | 97 | 0 | 1/24 | p69 |
| 2026-10-17 | 97 | 0 | 1/24 | p76 |
| 2026-10-16 | 97 | 0 | 1/24 | p65 |
| 2026-10-15 | 128 | 0 | 1/23 | p61 |
| 2026-10-14 | 128 | 0 | 2/23 | p76 |
| 2026-10-13 | 128 | 0 | 1/23 | p87 |
| 2026-10-12 | 128 | 0 | 0/23 | p96 |
| 2026-10-11 | 128 | 0 | 8/23 | p39 |
| 2026-10-10 | 128 | 0 | 8/23 | p30 |
| 2026-10-09 | 128 | 0 | 11/23 | p27 |
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