Lake Levels

Current Reservoir Levels

The Lake Tapps reservoir is at its recreational level (541.5′-543′) and Cascade intends to keep the level 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. 

July 27, 2018 Update:  

Cascade is meeting its agreement with the Lake Tapps homeowners to keep a full recreational pool of Lake Tapps reservoir levels between elevation 541.5 and 543 feet from mid-April until October.  Despite normal snow pack and a wet spring, the White River – where Lake Tapps gets its water – has been experiencing flows that are 20 to 40 percent below median flows since early June, with many days setting all-time record lows.  Cascade crews have been working 24/7 to divert and deliver any available water to achieve the goal of keeping lake between 542.5 and 542.7 feet during the summer recreational period.  While the reservoir is still meeting recreational pool requirements, the weather is setting records for heat and dryness, which is posing a significant challenge. Cascade will continue to keep residents up to date on flows, and residents can follow this 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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