Situational Awareness (Saturday, 2025-10-11)
Potomac River flow at the US Geological Survey’s Point of Rocks gage is currently slightly higher than CO-OP’s drought monitoring trigger of 2000 cubic feet per second (cfs). But recent and forecast rainfall is not sufficient to alleviate the current drought conditions. According to the Middle Atlantic River Forecast Center, no precipitation fell in the watershed over the past 24 hours. Accumulations of 1/4 to 3/4 inches are predicted over the next 3 days, with no appreciable precipitation expected during the following 7 days.
Special Conditions
None
Daily flows:
Little Falls gage flow 2025-10-10: 937 MGD (1450 cfs)
Little Falls gage flow 2025-10-11: 1060 MGD (est., based on recently available real-time data) (1640 cfs)
Note: Gage flow at Little Falls is measured after water supply withdrawals.
Point of Rocks flow 2025-10-10: 1370 MGD (2120 cfs)
Point of Rocks flow 2025-10-11: 1383 MGD (est., based on recently available real-time data) (2140 cfs)
Yesterday's estimated daily flows:
Great Falls estimated flow 2025-10-10: 937 MGD (1450 cfs)
Note: Estimated flow below Great Falls intake is flow at Little Falls plus Little Falls water supply withdrawal.
Yesterday's Washington metropolitan area Potomac River withdrawals and discharges (2025-10-10):
Fairfax Water Corbalis withdrawal - Potomac: 106 MGD
WSSC Water Potomac withdrawal: 136 MGD
Washington Aqueduct withdrawal - Great Falls: 135 MGD
Washington Aqueduct withdrawal - Little Falls: 0 MGD
Loudoun Water withdrawal: 11 MGD
Loudoun Water Broad Run discharge: 7 MGD
Total Potomac withdrawal: 388 MGD
Total net Potomac withdrawal: 382 MGD
Loudoun Water Potomac River (PR) flow values for drought operations protocol (based on yesterday's flows):
QPR: 2120 cfs
QPR, obs: 2120 cfs
QPR, WS: 0 cfs
Interstate Commission on the Potomac River Basin