Seattle Public Utilities Ray Hoffman, Director

Current Water Supply Conditions and Outlook

  • Masonry Pool Reservoir – This photo was taken on February 07, 2016 by Aaron Erman.

February 9, 2016

Periods of rain and snow continued last week and 1.83 inches and 1.59 inches of precipitation were recorded in our Cedar River and South Fork Tolt River watersheds, respectively. Snow continues to build in our mountain watersheds and accumulations are close to the long-term average for this time of the year.

Chester Morse Lake at the Overflow Dike is at elevation 1553.5 feet, about 2.8 feet lower than last week, and about 2.1 feet above its long-term average (based on the years 1989 to 2005). Masonry Pool Reservoir at Masonry Dam is at elevation 1553.0 feet, about 3.2 feet lower than last week, and about 4.5 feet above its long term average. The South Fork Tolt Reservoir at the South Fork Tolt Dam is at elevation 1758.1 feet, about 2.6 feet lower than last week, and about 3.2 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 102 mgd. That is more than the 101 mgd consumed during the same period last year, and less than the average of 114 mgd used during the same period over the years 1999-2008.

Current water supply graphs (pdf)

Related links

Landsburg Mitigation
Water Sources and Treatment