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Project update

Construction Update – April 16, 2018

Crews prepare for upcoming open cut construction 

Starting as soon as the week of April 23, King County’s contractor plans to install new sewer pipe via open cut construction along 164th Place Southeast between Southeast 38th Street and Vasa Creek. This phase of open cut construction is expected to continue for three to four weeks. 

The contractor has determined this phase of work does not require a full road closure. Instead, crews will use single-lane closures on 164th Place Southeast to install new sewer pipe. 

Please note that future open cut and trenchless construction will occur along 164th Place Southeast through the end of 2018. As future phases of work are scheduled, we will follow-up with additional information of what you can expect.

You can expect:

  • Temporary driveway access restrictions
  • Traffic delays of up to 20 minutes during work hours. Flaggers will be present to direct traffic.
  • Increased noise from concrete cutting, excavation and pipe installation
  • Temporary roadway patches so crews can re-open affected lanes to traffic when they’re not working
  • Access maintained for services including emergency, waste pickup, school buses, and mail delivery

For more information, view the project update

If you have questions, please call the 24-hour construction hotline at 206-296-7800 or email De’Sean Quinn at


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Project description

The Sunset and Heathfield Pump Stations and related sewer pipes send sewage from Sammamish, Issaquah, and Bellevue to be cleaned at King County’s treatment plant in Renton. This sewer system has provided reliable service for around 50 years and is reaching its limit.

This project will upgrade both pump stations and the connected force main pipe. The project will also upgrade the Eastgate Trunk structure near I-90. The Eastgate Trunk connects the force main pipe to a larger pipe, carrying flows to be treated at the South Treatment Plant in Renton. The improved system will help serve the growing population for many years.

Read our December 2016 newsletter for more information about how community feedback influenced final design and for details about upgrades to the pump stations

Sunset Pump Station upgrades

Sunset Pump Station Final Design

  • Four new pumps to increase capacity
  • New electrical and controls systems
  • New standby generator allowing the station to continue operating during power outages
  • New heating and air conditioning systems (HVAC)
  • Addition of native plans and restoration of shoreline habitat
  • Roof replacement and added green roof to manage stormwater
  • New lighting and fencing
  • Permeable driveway

Heathfield Pump Station upgrades

Heathfield Pump Station Final Design

  • New lighting and fencing
  • Four new pumps to increase capacity
  • New electrical and controls systems
  • New standby generator
  • New heating and air conditioning systems (HVAC)
  • Rain garden
  • Landscaping
  • Roof replacement

Project area

Project schedule

Construction is expected to start as early as summer 2017 and end in 2020.

1707_Sunset_Heathfield_construction-schedule_800View high-resolution version .

Project location

Project locator map for Sunset and Heathfield pump stations and force main upgrade

Back to the capital projects overview map .

Heathfield Pump Station,
3541 163rd Ave. S.E., Bellevue

Sunset Pump Station,
3730 W. Lake Sammamish Pkwy. S.E., Bellevue