Seattle Public Utilities Mami Hara, General Manager/CEO

Current Water Supply Conditions

  • Masonry Pool ReservoirChester Morse Lake Reservoir – This photo was taken on December 10, 2017 by Kevin Johnson.

December 12, 2017

Last week, 0.00 inches and 0.00 inches of precipitation were recorded in our Cedar River and South Fork Tolt River watersheds, respectively.

Chester Morse Lake at the Overflow Dike was at elevation 1554.5 feet, about 2.3 feet lower than last week, and about 3.9 feet above its long-term average (based on the years 1989 to 2005). Masonry Pool Reservoir at Masonry Dam was at elevation 1554.4 feet, about 2.3 feet lower than last week, and about 5.5 feet above its long-term average. The South Fork Tolt Reservoir at the South Fork Tolt Dam was at elevation 1751.2 feet, about 0.2 feet higher than last week, and about 0.2 feet below its long-term average. Water releases from reservoir storage are actively being managed for water supply, hydropower, fish habitat and flood management objectives for both the Cedar and South Fork Tolt Rivers.

Water consumption for the previous seven days averaged approximately 103 million gallons per day (mgd). That is the same as the 103 mgd consumed during the same period last year, and less than the average of 113 mgd used during the same period over the years 1999-2014.

Current water supply graphs (pdf)