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Important Information on Cascade’s White River-Lake Tapps Improvement Project

August 14, 2014

Lake Tapps, WA  Cascade’s White River Lake Tapps improvement projects are underway. Over the next few weeks homeowners will notice more changes and should take note of their local conditions in determining what actions they need to take related to their homes, docks and water craft.  Cascade will give weekly updates on conditions and activities.

In July, Cascade filled the lake to its highest allowable level (elevation 543 feet) and closed the project headgate.  No water has been added to the lake since then (other than rainfall) and Cascade has minimized water released through the tailrace to keep the lake as full as possible throughout the summer.  Weather dependent, it is expected that recreational lake levels will be maintained through Labor Day.

Lake levels will be reduced following Labor Day. Cascade has tentatively set – project dependent – Monday Sept. 15 to begin this drawdown, during which the lake level will be reduced by up to a foot a day.

Residents should note their own unique conditions in their locations and make the determination when to remove their boats from the lake. While the drawdown will begin after Labor Day, some areas may become too shallow for some uses more quickly than others and homeowners should gauge accordingly.

Lake Levels and drawdowns depend on which projects Cascade is working on at a respective time, and will be determined on what each project requires.

Cascade is repairing Dike 3, replacing the last section of the timber flume, refurbishing the headgates and assessing facilities that drain water from the lake back to the White River and removing more than 100,000 cubic yards of sediment from the flowline.

For a current look at the projects that are underway and/or have been completed, as well as the latest information and current lake levels, visit

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