Lake Levels

Current Reservoir Levels

The Lake Tapps reservoir is at its recreational level and will remain between 542.5′ and 542.7′ for the summer season. As it does every year, Cascade increased levels to the maximum of 543.0′ for about 24 hours in early May. Cascade will do a slight drawdown in the fall (to about 539′) to protect dikes from waves, wind and storms in the fall and winter months. For current lake levels click here. 

Remember this is a cold, glacier-fed reservoir, so please swim and boat safely. Enjoy Lake Tapps!

General Reservoir Level Management

Cascade has owned and operated the Lake Tapps Reservoir since 2009. During that time, Cascade has managed lake levels in accordance with the provisions of the Lake Tapps Reservoir Water Rights, which incorporate relevant provisions from the 2009 Agreement regarding Lake Tapps between Cascade Water Alliance and the Lake Tapps Community and the 2008 White River Management Agreement between the Puyallup Tribe of Indians, the Muckleshoot Indian Tribe and Cascade Water Alliance.

The Water Rights and the agreements provide for Cascade to maintain recreational reservoir levels or normal full pool, between elevation 541.5′ and 543.0′ (gage height) from April 15 through Sept. 30.

Typical fall drawdown to a lake level of approximately elevation 538′ – 539′ is sufficient to protect the integrity of the Lake Tapps dikes and for any routine inspections. This minimizes the wear on the valves in the power house during fall drawdown and the risk of problems refilling the Lake Tapps Reservoir during periods of water shortage.

Specific dike or other maintenance projects will require Cascade to reduce the lake level in the fall and winter to approximately elevation 533′ to 535′ (some projects may require the level to be lower).

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