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Heathfield Force Main Rehabilitation

The Heathfield Pump Station has two pressurized sewer pipes. These pipes help move sewage to South Treatment Plant in Renton via the Eastgate Trunk. Since August 2024, the older of the two pipes has been out of service. This project aims to rehabilitate the older pipe, built in 1983, and bring it back into service.

Project background

In August 2024, King County wastewater operators were doing regular maintenance at the Heathfield Pump Station. During that work, the older of the two pressurized pipes broke near the station.

King County quickly fixed 100 feet of the broken pipe. Since then, the pipe has remained out of service while King County further investigated it’s condition. The newer pipe, built in 2022, has been able to move sewage to the regional treatment plant to be cleaned and safely released into Puget Sound.

This project aims to rehabilitate the rest of the older sewer pipe so we can return it to service. Once operational, it will help carry higher levels of flows that come to the pump station during winter storms.

Project update

September 19, 2025

Construction to begin September 22 

Construction on SE 35th PL will begin as early as September 22 and will occur for approximately six to 10 weeks.

King County and the City of Bellevue are working together to keep an eye on traffic during construction. Our goal is to reduce traffic delays while making sure the work is done safely before the rainy season starts.

To help with this, the City has agreed to extend work hours on SE 35th PL. This gives crews more time to set up traffic signs and begin construction each day. .

Approved work hours are:

  • General Work Hours: 7am to 6pm on weekdays
  • Roadway Work Hours: 8 am to 5 pm on weekdays
    • We anticipate most impactful work to take place between 9 am and 3 pm

Work hours in the roadway may change again depending on traffic impacts. We will update the project website with any additional changes.

Aerial Map of the Heathfield force main located in Bellevue between King County’s Heathfield Pump Station and East Gate Trunk.Construction will take place next to the eastbound travel lane on SE 35th PL.

During construction, you can expect:

  • Work hours are from 7 am to 6 pm on weekdays, with work in the roadway anticipated from 8 am through 5 pm 
  • Crews plan to work along the right-of-way on SE 35th PL and will close the eastbound travel lane to provide a safe work area 
  • Staging of construction equipment and vehicles will take place at the Heathfield Pump Station and in the right-of-way 
  • Flaggers will direct alternating traffic through the open lane for drivers. The road will not be fully closed. 
  • Increased noise and vibration, typical of a construction site.
  • Work is expected to take 6 to 10 weeks to complete.

Background:

King County finished our assessment of the pipe that broke in August 2024. We found that the pipe needs additional repairs to about 100 feet of the pipe located near SE 35th PL. These repairs are important to finish before the rainy season starts.

We appreciate the patience of neighbors near the Heathfield Pump Station while we bring the pipe back into service.

For questions or concerns related to the Heathfield Force Main Rehabilitation, please contact Annie Plumley at HeathfieldPumpRepair@kingcounty.gov or at 206-263-4088.

Previous project updates

Project location

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