Situational Awareness (Thursday, 2025-10-09)
Potomac River flows are holding relatively steady. No appreciable amount of rain fell in the Potomac watershed yesterday. According to the Middle Atlantic River Forecast Center, 1/10 to 1/4 inch is expected over the next three days in most parts of the watershed, and an average accumulation of more than 1/2 inch is expected over the next 4 days.
Special Conditions
None
Daily flows:
Little Falls gage flow 2025-10-08: 944 MGD (1460 cfs)
Little Falls gage flow 2025-10-09: 911 MGD (est., based on recently available real-time data) (1410 cfs)
Note: Gage flow at Little Falls is measured after water supply withdrawals.
Point of Rocks flow 2025-10-08: 1053 MGD (1630 cfs)
Point of Rocks flow 2025-10-09: 1163 MGD (est., based on recently available real-time data) (1800 cfs)
Yesterday's estimated daily flows:
Great Falls estimated flow 2025-10-08: 944 MGD (1461 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 (2025-10-08):
Fairfax Water Corbalis withdrawal - Potomac: 100 MGD
WSSC Water Potomac withdrawal: 130 MGD
Washington Aqueduct withdrawal - Great Falls: 138 MGD
Washington Aqueduct withdrawal - Little Falls: 0 MGD
Loudoun Water withdrawal: 12 MGD
Loudoun Water Broad Run discharge: 6 MGD
Total Potomac withdrawal: 380 MGD
Total net Potomac withdrawal: 374 MGD
Loudoun Water Potomac River (PR) flow values for drought operations protocol (based on yesterday's flows):
QPR: 1630 cfs
QPR, obs: 1630 cfs
QPR, WS: 0 cfs
Interstate Commission on the Potomac River Basin