Lake Forest Park Reservoir Floating Cover Replacement

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Project map

Project Description

The Lake Forest Park Reservoir is located in the City of Lake Forest Park and is part of Seattle Public Utilities' regional drinking water system. The reservoir has a floating cover that was installed in 2001 and designed to last about 20 years. Due to increased maintenance and repair work needed to keep the aging cover operational, SPU has decided to replace it with a new floating cover.

Construction to replace the floating cover will involve:

  • Draining the reservoir and preparing the site for construction
  • Removing and dispose of the existing floating cover
  • Installing a new liner and floating cover
  • Replacing pumps, pipes, hoses, and other equipment
  • Restoring the site after construction is complete

This work will enable SPU to supply quality drinking water to people in the greater Seattle area. 


The Lake Forest Park Reservoir is located north of NE 195th St between 45th Ave NE and 47th Ave NE in the City of Lake Forest Park (project area map). The project will primarily be contained to SPU's property with minimal impacts to nearby residents.

What's Happening Now?

The design of the new floating cover is complete, and the project team is preparing for construction, which is expected to begin in May 2021.

SPU will share updates as we work to bring the contractor onboard and prepare for construction. In the meantime, please review the Project Fact Sheet for more information and signup for the project email list.

Community Benefits

When construction is complete, the new floating cover will provide protection from sunlight, dirt, leaves, and other debris to help preserve water service and quality.

Anticipated Impacts

During construction, you can expect:

  • Crews are expected to work 8-10 hour days Monday through Friday with Saturday work likely to allow most of the work to be performed during the dry weather season.
  • General construction traffic and noise during working hours.
  • The construction work will take place within the reservoir site.
  • No road closures are expected, but there will be increased construction traffic in the area.
  • The walking path that goes around the reservoir site will generally remain open and accessible. It may be temporarily blocked for up to two days when the construction entrance is being installed.
  • Nearby roadways and paths may experience brief temporary delays to accommodate equipment and materials moving in and out of the construction site. Although the project will take place near Horizon View Park, there are no anticipated impacts for park visitors. This work will not impact water services to homes and businesses.

Community Engagement

SPU will provide email updates about the Lake Forest Park Reservoir Floating Cover Replacement Project throughout construction. If you are interested in receiving updates, please subscribe to the project email list.


Early 2021

  • Pre-construction meeting with contractor and initial construction outreach to community
  • Site preparation and cover installation is currently scheduled to begin in May

Mid 2021

  • The contractor will work to complete the reservoir cover installation to bring the reservoir back into operation by the end of 2021.
  • SPU will provide project updates, as needed, via the project website and email list.

Construction on this project is dependent on weather and other factors, and the start date and duration of work is subject to change.


Project Documents