Water Supply Conditions
The current supply conditions for Seattle's regional water system.
Masonry Pool, October 19, 2025. This photo was taken by Kenny Petrovich.
October 20, 2025
Last week, the 7-day precipitation total for the period 10/13/2025 through 10/19/2025 was approximately 3.74 inches in the Cedar River watershed and 1.96 inches in the South Fork (S.F.) Tolt River watershed.
Chester Morse Lake at the Overflow Dike was at an elevation of 1542.1 feet, about 1.8 feet lower than last week and about 5.2 feet lower than its long-term average (based on the years 1990 to 2019). The S.F. Tolt Reservoir at the S.F. Tolt Dam was at an elevation of 1723.9 feet, about 0.5 feet lower than last week and about 15.4 feet lower than its long-term average. Water releases from reservoir storage are actively being managed for water supply, fish habitat, and flood management objectives for both the Cedar and S.F. Tolt Rivers.
Water consumption for the previous seven days averaged approximately 111 million gallons per day (mgd). That is less than 112 mgd consumed during the same period last year, and more than 108 mgd used during the same period over the years 2010-2019.
Seattle continues to closely monitor conditions and make operational adjustments to efficiently manage the region’s water supply through this dry year. As we await the important return of fall rains, we anticipate having sufficient water for people and fish this fall but continue to ask customers to always use water wisely. For information about ways to save water, visit the Saving Water Partnership website.