Situational Awareness (Saturday, 2025-09-06)
Potomac River flows continue to decline. According to the Middle Atlantic River Forecast Center predictions, average rainfall in the Potomac watershed yesterday was negligible and approximately 1/4 inch is expected over the next 24 hours.
Special Conditions
The USACE has cancelled Jennings Randolph Reservoir artificially varied flow (AVF) releases scheduled for September 20th and 21st due to lack of cold water storage in the reservoir. The Corps is trying to meet water temperature targets in their releases to support the water quality mission of the project.
Daily flows:
Little Falls gage flow 2025-09-05: 1047 MGD (1620 cfs)
Little Falls gage flow 2025-09-06: 1144 MGD (est., based on recently available real-time data) (1770 cfs)
Note: Gage flow at Little Falls is measured after water supply withdrawals.
Point of Rocks flow 2025-09-05: 1306 MGD (2020 cfs)
Point of Rocks flow 2025-09-06: 1163 MGD (est., based on recently available real-time data) (1800 cfs)
Yesterday's estimated daily flows:
Great Falls estimated flow 2025-09-05: 0 MGD (0 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 (2025-09-05):
Fairfax Water Corbalis withdrawal - Potomac: 126 MGD
WSSC Water Potomac withdrawal: 136 MGD
Washington Aqueduct withdrawal - Great Falls: 141 MGD
Washington Aqueduct withdrawal - Little Falls: 0 MGD
Loudoun Water withdrawal: 12 MGD
Loudoun Water Broad Run discharge: 6 MGD
Total Potomac withdrawal: 414 MGD
Total net Potomac withdrawal: 408 MGD
Loudoun Water Potomac River (PR) flow values for drought operations protocol (based on yesterday's flows):
QPR: 2020 cfs
QPR, obs: 2020 cfs
QPR, WS: 0 cfs
Interstate Commission on the Potomac River Basin