Lake Tapps Winter Levels Updated; Short Drawdown Scheduled | Cascade Water Alliance

Over the next three weeks, the reservoir will be drawn down approximately six to eight feet.

  • Tuesday, January 17, 2017 10:56am
  • News

Cascade Water Alliance announced last week there will be a short-term drawdown for the Lake Tapps Reservoir this winter in conjunction with Cascade’s installation and testing of repaired, rehabilitated and new valves at the Powerhouse. Over the next three weeks, the reservoir will be drawn down approximately six to eight feet.

The drawdown began last weekend, with Lake Tapps levels dropping slowly (approximately two to four inches) by early this week. The next week will see a rapid reduction in level (by approximately two to two and one-half feet) by the end of the third week in January. The new valve will then undergo acceptance testing, resulting in a further reduction in levels by approximately one to one and one-half feet by the end of January. Cascade anticipates the reservoir will reach its lowest level of approximately elevation 536.5 feet by early February. This level will be maintained, weather dependent, until refill begins in early March.

Cascade is completing its work at the Powerhouse installing and testing a new $2 million energy dissipating valve during this time. The new valve (in conjunction with the repaired/rehabilitated existing valves) will ensure even more reliability and safety in operating the reservoir.

Active fill will begin in early March with the anticipation of reaching full recreational levels of elevation 541.5 to 542.5 feet by mid-April. Cascade will, for a short time during the spring, raise the level up to elevation 543 feet, which is the maximum permissible level for Lake Tapps, to remind residents of the legal high water mark. This is done every year during the spring. Cascade will maintain Lake Tapps at an approximately elevation of 542.5 and 542.8 feet throughout the summer and early fall.

Several residents and some homeowner associations have asked for lower reservoir levels to do important construction projects. If homeowners have been considering any improvements to their property or beginning new projects, they should plan to do so between early February and early March. Cascade reminds residents they must obtain all appropriate permits as well as a Cascade license prior to beginning any construction. The time to apply is now.

For more informationabout Cascade and Lake Tapps visit and for information regarding licenses for project work visit

More in News

Following resignation, POM will again be searching for director

The board of directors met Dec. 12 to discuss the issue.

The city of Maple Valley’s state Route 169 improvements will be made between Witte Road Southeast and Southeast 240th Street, the stretch of road just southeast of the city’s SR 18 interchange. Image courtesy of the city of Maple Valley
Improvements to SR 169 underway, may affect local commuters

If you drive north through Maple Valley, these road-widening projects will probably affect your arrival time.

White River officially kicks off Glacier Middle School project

Also, Wilkeson Elementary slated to be opened early January.

Spiketon Bridge to get temporary repair

By next fall, a two-lane temporary bridge is expected to help ease Buckley traffic.

Bonney Lake family sued over deceptive charity practices

The King County Superior Court ruled four multi-state charities used false or misleading statements in solicitations, tricking donors into donating money when they otherwise may not have.

A woman works on a drawing next to an unused viewing scope as a smoky haze obscures the Space Needle and downtown Seattle last August as smoke from wildfires moved across the region. (Photo courtesy of The Herald/Elaine Thompson/Associated Press)
Why do Washington voters struggle with climate change policies?

Despite environmental awareness and the public’s apparent desire for reform, statewide initiatives keep failing

Dead passengers in fatal SR 164 crash identified

One of the passengers was a local middle schooler.

Flavored tobacco: a candy-coated addiction | Public Health Insider

Is it a candy? A juice box? Or liquid nicotine?

Mary Lynn Pannen, founder and CEO of Sound Options, has consulted thousands of Washington families on geriatric care for 30 years. Photo courtesy of Sound Options.
Elder abuse cases are on the rise in Washington

Local agencies and geriatric care managers aim to increase public awareness about the epidemic.

Most Read