Situational Awareness (Tuesday, 2025-12-23)
According to information from the Middle Atlantic River Forecast Center, 0.01 to 0.25 inches of rain fell in the northern portion of the Potomac watershed during the past 24 hours and average accumulations of approximately 0.1 inches are expected over the next 3 days.
Special Conditions
Yesterday’s daily flow at Point of Rocks was unavailable and was computed from provisional real-time data.
Daily flows:
Little Falls gage flow 2025-12-22: 1629 MGD (2520 cfs)
Little Falls gage flow 2025-12-23: 1616 MGD (est., based on recently available real-time data) (2500 cfs)
Note: Gage flow at Little Falls is measured after water supply withdrawals.
Point of Rocks flow 2025-12-22: 1362 MGD (2106 cfs)
Point of Rocks flow 2025-12-23: 1415 MGD (est., based on recently available real-time data) (2190 cfs)
Yesterday's estimated daily flows:
Great Falls estimated flow 2025-12-22: 1629 MGD (2520 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 (2025-12-22):
Fairfax Water Corbalis withdrawal - Potomac: 87 MGD
WSSC Water Potomac withdrawal: 153 MGD
Washington Aqueduct withdrawal - Great Falls: 116 MGD
Washington Aqueduct withdrawal - Little Falls: 0 MGD
Loudoun Water withdrawal: 9 MGD
Loudoun Water Broad Run discharge: 8 MGD
Total Potomac withdrawal: 365 MGD
Total net Potomac withdrawal: 357 MGD
Loudoun Water Potomac River (PR) flow values for drought operations protocol (based on yesterday's flows):
QPR: 2106 cfs
QPR, obs: 2106 cfs
QPR, WS: 0 cfs
Interstate Commission on the Potomac River Basin