Situational Awareness (Wednesday, 2025-09-03)
Dry conditions persist. According to Middle Atlantic River Forecast Center predictions, average basin rainfall may be around 0.2 inches over the next 3 days.
Special Conditions
None
Recent basin-wide average precipitation (above Little Falls):
(based on CO-OP's Low Flow Forecast System analysis of Middle Atlantic River Forecast Center (MARFC) gridded multisensor precipitation estimates)
Yesterday's area-weighted average basin precipitation: 0.26 (inches)
Past 3-day cumulative area-weighted average basin precipitation: 0.26 (inches)
Past 7-day cumulative area-weighted average basin precipitation: 0.7 (inches)
Daily flows:
Little Falls gage flow 2025-09-02: 1066 MGD (1650 cfs)
Little Falls gage flow 2025-09-03: 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 2025-09-02: 1241 MGD (1920 cfs)
Point of Rocks flow 2025-09-03: 1189 MGD (est., based on recently available real-time data) (1840 cfs)
Yesterday's estimated daily flows:
Great Falls estimated flow 2025-09-02: 1066 MGD (1649 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 (2025-09-02):
Fairfax Water Corbalis withdrawal - Potomac: 136 MGD
WSSC Water Potomac withdrawal: 156 MGD
Washington Aqueduct withdrawal - Great Falls: 146 MGD
Washington Aqueduct withdrawal - Little Falls: 0 MGD
Loudoun Water withdrawal: 13 MGD
Loudoun Water Broad Run discharge: 7 MGD
Total Potomac withdrawal: 451 MGD
Total net Potomac withdrawal: 444 MGD
Loudoun Water Potomac River (PR) flow values for drought operations protocol (based on yesterday's flows):
QPR: 1920 cfs
QPR, obs: 1920 cfs
QPR, WS: 0 cfs
Interstate Commission on the Potomac River Basin