Seattle Public Utilities Mami Hara, General Manager/CEO

Current Water Supply Conditions

  • Masonry Pool ReservoirThis photo was taken on October 23, 2016 by Aaron Erman.

October 25, 2016

Another round of precipitation hit the Pacific Northwest region last week as this shapes up to be one of the wettest Octobers on record. Last week 3.8 inches and 3.4 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 1552.1 feet, about 0.8 feet higher than last week, and about 6.3 feet above its long term average (based on the years 1989 to 2005). Masonry Pool Reservoir at Masonry Dam is at elevation 1551.1 feet, about 16.8 feet higher than last week, and about 10.8 feet above its long term average. The South Fork Tolt Reservoir at the South Fork Tolt Dam is at elevation 1746.9 feet, about 4.1 feet higher than last week, and about 2.8 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 pproximately 103 million gallons per day (mgd). That is less than the 109 mgd consumed during the same period last year, and less than the average of 117 mgd used during the same period over the years 1999-2014.

Related links

Current water supply graphs (pdf)

Related links

Landsburg Mitigation
Water Sources and Treatment