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Project update

Construction Update: Road closure information – August 14, 2018

Intermittent lane closures on W Lake Sammamish Parkway SE near the intersection of SE 38th St

  • Estimated duration: Once a week through August and September and daily from the end of September into November. 
  • Timing: closures will occur between the hours of 9:00 AM and 3:00 PM. 
  • What to expect: Flaggers will be on site to guide cars and bikes through the area. They will direct traffic through the area as quickly as possible, but during busy times, you can expect delays of up to 15 minutes. 

Southeast 35th Place lane closures

Crews continue to close sections of a single-lane on SE 35th Pl.

164th Place Southeast road closure

Crews have been working on the first jack-and-bore pit near the Heathfield Pump Station for the past few weeks. To install a pipe via jack-and-bore, crews must dig a second pit so that they can drill a hole between the two pits and insert the pipe. To excavate the second jack-and-bore pit, crews will close a short section of 164th Place Southeast, from Vasa Creek to the intersection with Southeast 35th Street (shown on the map below). This area of 164th Place Southeast is scheduled to be closed for 10 weeks as the pit will be too large to safely cover with steel plates.

road closure map

Please read the latest project update to learn more about what to expect from upcoming construction activities.

If you have questions, please call the 24-hour construction hotline at 206-296-7800 or email Caryn Sengupta 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

This schedule is current as of August, 2018. Construction is expected to end in 2020.

project timelineProject schedule

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