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SPU is dedicated to ensuring that all dams are designed, constructed, operated, and maintained with your utmost safety in mind. SPU continually inspects, evaluates, and documents the design, construction, operation, maintenance, rehabilitation, and emergency preparedness for each dam.
The mission of the SPU Dam Safety Program is to ensure safe operation of the dams and the Cedar Moraine embankment owned by SPU. The program goal is to:
SPU has comprehensive dam safety, monitoring and surveillance equipment in place. Scientific instruments are installed to continuously monitor dam performance by measuring reservoir levels, groundwater within dams, and stream flows. Operation crews perform daily visual inspections on all dams and report unusual conditions and high instrument readings to dam engineers. Federal and state regulators work with our SPU staff to perform annual inspections to ensure safe operating conditions.
All our dams meet current engineering standards and are in compliance with state and federal regulations.
SPU has developed emergency action plans for each high hazard dam facility. These plans are updated on an annual basis, in partnership with local emergency management agencies, King County, the National Weather Service, and state and federal dam regulators.
Cedar River Watershed (Seattle Public Utilities)
Tolt River Watershed (Seattle Public Utilities)
Take Winter By Storm! (Regional Public Information Network)
Howard Hanson Dam (U.S. Army Corps of Engineers)