Monitoring Reports

During periods of drought, the Cooperative Water Supply Operations on the Potomac (CO-OP) helps manage the Washington metropolitan area water supply system by coordinating withdrawals from the Potomac River and off-river reservoirs and recommending releases from upstream reservoirs when forecasted flow in the river is not sufficient to meet expected needs. These needs include water demands and an environmental flow-by of 100 million gallons per day (MGD) on the Potomac River at Little Falls dam near Washington, D.C.

RESUMING DAILY DROUGHT MONITORING: Daily Potomac flow and demand update (Friday, 2026-01-23)

Submitted by admin1 on Fri, 01/23/2026 - 12:48

Situational Awareness (Friday, 2026-01-23)
Potomac River flow at the USGS’s Point of Rocks gage has again fallen below 2000 cfs, CO-OP threshold for daily drought monitoring and reporting. According to information from the Middle Atlantic River Forecast Center, no precipitation fell in the portion of the watershed above the USGS’s Little Falls gage during the past 24 hours. This weekend’s storm event is predicted to bring an average of approximately 1 1/2 inches to the watershed in the form of snow and ice. 

Daily Potomac flow and demand update (Thursday, 2026-01-15)

Submitted by snummer on Thu, 01/15/2026 - 14:01

Situational Awareness (Thursday, 2026-01-15)
Over the past 24 hours trace amounts of rain fell in the northern portions of the basin, reaching up to approximately 0.25 inches in localized areas. The next 3 days may see up to 0.1 inches of rain across the basin, according to the Middle Atlantic River Forecast Center predictions. 

Special Conditions
None

Daily Potomac flow and demand update (Wednesday, 2026-01-14)

Submitted by admin1 on Wed, 01/14/2026 - 13:16

Situational Awareness (Wednesday, 2026-01-14):
According to the Middle Atlantic River Forecast Center, no precipitation was observed across the basin yesterday. The next weather system is expected to bring light rain transitioning to snow this evening into Thursday morning. Over the next three days, average basin precipitation is forecast to range from 0.01 to 0.25 inches, with slightly higher amounts possible in the North Branch over the five- to seven-day forecast period.

Special Conditions:
None

Daily Potomac flow and demand update (Thursday, 2026-01-08)

Submitted by snummer on Thu, 01/08/2026 - 14:23

Situational Awareness (Thursday, 2026-01-08)
According to the Middle Atlantic River Forecast Center, no rain fell in the basin over the past 24 hours. Over the next 3 days, the average basin rainfall may be between 0.5 and 1.5 inches, with the greatest amounts expected in the southwestern portion of the basin. 

Special Conditions
None

Daily Potomac flow and demand update (Wednesday, 2026-01-07)

Submitted by hmoltz on Wed, 01/07/2026 - 13:14

Situational Awareness (Wednesday, 2026-01-07)
According to the Middle Atlantic River Forecast Center, trace amounts of precipitation fell in small, scattered areas of the upper basin over the past 24 hours.  Over the next 3 days, precipitation totals of 0.01 to 0.75 inches are expected, with the higher amounts predicted in the southwestern portion of the basin. 

Special Conditions
None

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