Situational Awareness (Monday, 2025-10-13)
The impact of the recent storm system has been disappointing from a water supply point of view. According to information from the Middle Atlantic River Forecast Center, accumulations of roughly 1/10 to 2/10 of an inch of precipitation fell in the Potomac watershed over the past 72 hours, and a watershed average of approximately 2/10 of an inch is expected over the next 3 days.
Special Conditions
None
Daily flows:
Little Falls gage flow 2025-10-12: 1209 MGD (1870 cfs)
Little Falls gage flow 2025-10-13: 1086 MGD (est., based on recently available real-time data) (1680 cfs)
Note: Gage flow at Little Falls is measured after water supply withdrawals.
Point of Rocks flow 2025-10-12: 1202 MGD (1860 cfs)
Point of Rocks flow 2025-10-13: 1189 MGD (est., based on recently available real-time data) (1840 cfs)
Yesterday's estimated daily flows:
Great Falls estimated flow 2025-10-12: 1209 MGD (1871 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 (2025-10-12):
Fairfax Water Corbalis withdrawal - Potomac: 81 MGD
WSSC Water Potomac withdrawal: 104 MGD
Washington Aqueduct withdrawal - Great Falls: 130 MGD
Washington Aqueduct withdrawal - Little Falls: 0 MGD
Loudoun Water withdrawal: 11 MGD
Loudoun Water Broad Run discharge: 7 MGD
Total Potomac withdrawal: 327 MGD
Total net Potomac withdrawal: 320 MGD
Loudoun Water Potomac River (PR) flow values for drought operations protocol (based on yesterday's flows):
QPR: 1860 cfs
QPR, obs: 1860 cfs
QPR, WS: 0 cfs
Interstate Commission on the Potomac River Basin