Seattle Public Utilities Ray Hoffman, Director

Current Water Supply Conditions and Outlook

  • Chester Morse Lake Reservoir – This photo was taken on April 24, 2016 by Mark Hopf.

April 26, 2016

Last week 1.30 inches and 1.30 inches of precipitation were recorded in our Cedar River and South Fork Tolt River watersheds, respectively.

Chester Morse Lake at the Overflow Dike is at elevation 1562.3 feet, about 2.3 feet higher than last week, and about 6.2 feet above its long term average (based on the years 1989 to 2005). Masonry Pool Reservoir at Masonry Dam is at elevation 1562.2 feet, about 2.3 feet higher than last week, and about 7.2 feet above its long term average. The South Fork Tolt Reservoir at the South Fork Tolt Dam is at elevation 1762.5 feet, about 0.1 feet higher than last week, and about 1.7 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 120 mgd. That is more than the 110 mgd consumed during the same period last year, and more than the average of 119 mgd used during the same period over the years 1999-2008.

Current water supply graphs (pdf)

Related links

Landsburg Mitigation
Water Sources and Treatment