Situational Awareness (Sunday, 2025-09-07)
Potomac River flows are holding steady due to recent light rainfall. Though more rain is expected in the DC metro region today, the Middle Atlantic River Forecast Center predicts no appreciable precipitation in the Potomac watershed above Little Falls over the next 3 days.
Special Conditions
None
Daily flows:
Little Falls gage flow 2025-09-06: 1170 MGD (1810 cfs)
Little Falls gage flow 2025-09-07: 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 2025-09-06: 1157 MGD (1790 cfs)
Point of Rocks flow 2025-09-07: 1163 MGD (est., based on recently available real-time data) (1800 cfs)
Yesterday's estimated daily flows:
Great Falls estimated flow 2025-09-06: 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 (2025-09-06):
Fairfax Water Corbalis withdrawal - Potomac: 108 MGD
WSSC Water Potomac withdrawal: 152 MGD
Washington Aqueduct withdrawal - Great Falls: 149 MGD
Washington Aqueduct withdrawal - Little Falls: 0 MGD
Loudoun Water withdrawal: 12 MGD
Loudoun Water Broad Run discharge: 7 MGD
Total Potomac withdrawal: 421 MGD
Total net Potomac withdrawal: 414 MGD
Loudoun Water Potomac River (PR) flow values for drought operations protocol (based on yesterday's flows):
QPR: 1790 cfs
QPR, obs: 1790 cfs
QPR, WS: 0 cfs
Interstate Commission on the Potomac River Basin