Lake Levels

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 feet and 543.0 feet (gage height) from April 15 through Sept. 30, and that Cascade will reduce the lake level in the fall and winter for safety and maintenance purposes to approximately elevation 533 to 535 feet (except when specific maintenance projects require the level to be lower). For current lake levels click here.

Typical fall drawdown to a lake level of approximately elevation 538 – 539 feet is sufficient to protect the integrity of the Lake Tapps dikes and for any routine maintenance and inspections to occur. 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. Cascade will regularly maintain fall/winter levels in this range.