Situational Awareness (Tuesday, 2025-11-04)
According to the Middle Atlantic River Forecast Center, only negligible amounts of precipitation fell in the Potomac watershed yesterday and little is expected over the next 3 days. We expect Potomac River flows at Point of Rocks to fall back below 2000 cfs in the coming days.
Special Conditions
Washington Aqueduct sent us a notification that they planned to drain their old conduit on Monday 11/3 for an inspection and discharge drainage via their Maryland outfalls and pump from the Little Falls Pumping Station throughout this week.
Daily flows:
Little Falls gage flow 2025-11-03: 1939 MGD (3000 cfs)
Little Falls gage flow 2025-11-04: 1945 MGD (est., based on recently available real-time data) (3010 cfs)
Note: Gage flow at Little Falls is measured after water supply withdrawals.
Point of Rocks flow 2025-11-03: 1971 MGD (3050 cfs)
Point of Rocks flow 2025-11-04: 1907 MGD (est., based on recently available real-time data) (2950 cfs)
Yesterday's estimated daily flows:
Great Falls estimated flow 2025-11-03: 1970 MGD (3048 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 (2025-11-03):
Fairfax Water Corbalis withdrawal - Potomac: 82 MGD
WSSC Water Potomac withdrawal: 122 MGD
Washington Aqueduct withdrawal - Great Falls: 97 MGD
Washington Aqueduct withdrawal - Little Falls: 31 MGD
Loudoun Water withdrawal: 11 MGD
Loudoun Water Broad Run discharge: 8 MGD
Total Potomac withdrawal: 342 MGD
Total net Potomac withdrawal: 335 MGD
Loudoun Water Potomac River (PR) flow values for drought operations protocol (based on yesterday's flows):
QPR: 3050 cfs
QPR, obs: 3050 cfs
QPR, WS: 0 cfs
Interstate Commission on the Potomac River Basin