Situational Awareness (Thursday, 2025-09-04)
River flows continue to slowly decline. According to the Middle Atlantic River Forecast Center, no appreciable rain fell in the watershed over the past 3 days. But forecasts indicate that the watershed will receive approximately 1/2 inch of rain over the next 3 days.
Special Conditions
None
Daily flows:
Little Falls gage flow 2025-09-03: 1041 MGD (1610 cfs)
Little Falls gage flow 2025-09-04: 1008 MGD (est., based on recently available real-time data) (1560 cfs)
Note: Gage flow at Little Falls is measured after water supply withdrawals.
Point of Rocks flow 2025-09-03: 1209 MGD (1870 cfs)
Point of Rocks flow 2025-09-04: 1202 MGD (est., based on recently available real-time data) (1860 cfs)
Yesterday's estimated daily flows:
Great Falls estimated flow 2025-09-03: 1041 MGD (1611 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 (2025-09-03):
Fairfax Water Corbalis withdrawal - Potomac: 126 MGD
WSSC Water Potomac withdrawal: 138 MGD
Washington Aqueduct withdrawal - Great Falls: 152 MGD
Washington Aqueduct withdrawal - Little Falls: 0 MGD
Loudoun Water withdrawal: 13 MGD
Loudoun Water Broad Run discharge: 7 MGD
Total Potomac withdrawal: 429 MGD
Total net Potomac withdrawal: 422 MGD
Loudoun Water Potomac River (PR) flow values for drought operations protocol (based on yesterday's flows):
QPR: 1870 cfs
QPR, obs: 1870 cfs
QPR, WS: 0 cfs
Interstate Commission on the Potomac River Basin