Situational Awareness (Friday, 2025-09-05)
Potomac River flow is holding steady. According to the Middle Atlantic River Forecast Center, there was light rainfall in most areas of the watershed yesterday, and accumulations of 0.10 to 0.50 inches are expected in most areas during the next 3 days.
Special Conditions
None
Daily flows:
Little Falls gage flow 2025-09-04: 1008 MGD (1560 cfs)
Little Falls gage flow 2025-09-05: 1034 MGD (est., based on recently available real-time data) (1600 cfs)
Note: Gage flow at Little Falls is measured after water supply withdrawals.
Point of Rocks flow 2025-09-04: 1273 MGD (1970 cfs)
Point of Rocks flow 2025-09-05: 1370 MGD (est., based on recently available real-time data) (2120 cfs)
Yesterday's estimated daily flows:
Great Falls estimated flow 2025-09-04: 1008 MGD (1560 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 (2025-09-04):
Fairfax Water Corbalis withdrawal - Potomac: 113 MGD
WSSC Water Potomac withdrawal: 138 MGD
Washington Aqueduct withdrawal - Great Falls: 138 MGD
Washington Aqueduct withdrawal - Little Falls: 0 MGD
Loudoun Water withdrawal: 13 MGD
Loudoun Water Broad Run discharge: 7 MGD
Total Potomac withdrawal: 402 MGD
Total net Potomac withdrawal: 395 MGD
Loudoun Water Potomac River (PR) flow values for drought operations protocol (based on yesterday's flows):
QPR: 1970 cfs
QPR, obs: 1970 cfs
QPR, WS: 0 cfs
Interstate Commission on the Potomac River Basin