Lake Levels

Current Reservoir Levels

Lake Tapps Reservoir to Rise to 543′ Around May 20 (5/10/21)

Next week Cascade Water Alliance will raise the Lake Tapps Reservoir to approximately elevation 543 feet, the maximum allowable level at which Cascade can operate. The reservoir will reach this elevation on or around May 20 and will then be drawn down slightly to normal recreational summer levels.

Cascade has raised the reservoir to the maximum allowed at least once each year since it took ownership in late 2009, as a reminder to homeowners that this is the maximum fill level under operating agreements with the Lake Tapps Community Council.  After the maximum fill, Cascade will keep the reservoir between elevation 541.5 to 543 feet, usually between 542.5 and 542.7 feet, through late September, weather dependent.

As a reminder, residents who wish to do any work on their property, such as bulkheads, docks, boatlifts, etc., must obtain all the appropriate, required permits and a Cascade license prior to beginning any work.  Further, residents should keep in mind as they do work on their property, especially bulkheads, that Cascade has the authority to raise reservoir levels to elevation 543′ under current water rights, so any new or modified bulkheads should be built to at least elevation 544′. Cascade raises the reservoir to 543′ once a year for a day or so as a reminder.

For information regarding licenses for project work click here.

USGS Links:

Lake Tapps Level Gage

White River Gage

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).