Seattle Public Utilities Mami Hara, General Manager/CEO

Current Water Supply Conditions

  • Masonry Pool ReservoirChester Morse Lake Reservoir – This photo was taken on March 12, 2017 by Aaron Erman.

March 15, 2017

Last week, 5.5 inches and 5.1 inches of precipitation were recorded in our Cedar River and South Fork Tolt River watersheds, respectively. Snowpack is above the long-term average for this time of the year.

Chester Morse Lake at the Overflow Dike was at elevation 1552.0 feet, about 1 foot higher than last week, and about 0.5 feet above its long-term average (based on the years 1989 to 2005). Masonry Pool Reservoir at Masonry Dam was at elevation 1550.5 feet, about 1.1 feet higher than last week, and about 4.2 feet above its long-term average. The South Fork Tolt Reservoir at the South Fork Tolt Dam was at elevation 1758.6 feet, about 2 feet higher than last week, and about 2.3 feet above 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 105 million gallons per day (mgd). That is more than the 101 mgd consumed during the same period last year, and less than the average of 112 mgd used during the same period over the years 1999-2014.

Related links

Current water supply graphs (pdf)