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King County Washington home

Murray Force Main Rehabilitation

The Murray Force Main Rehabilitation project will rebuild a section of a pressurized sewer pipe called a force main to maintain reliable service to West Seattle residents living near Lowman Beach Park.

Project description

King County is rebuilding a damaged sewer pipe to maintain reliable sewer service for West Seattle residents near Lowman Beach Park and protect public health and Puget Sound.

The Murray Pump Station has two pressurized sewer pipes, also known as force mains. These pipes run parallel under Beach Drive Southwest and help move sewage to West Point Treatment Plant, where it is cleaned and safely discharged into Puget Sound. In March 2022, one of the pressurized pipes broke due to severe corrosion. King County repaired about 800 feet of the damaged pipe at that time. This project will repair the remaining 350 feet of damaged pipe and install two air valves to help reduce pipe corrosion in the repaired pipe.

This work needs to occur during the dry season when wastewater flows are lower. Road and park restoration will occur in fall 2026 after the pipe is rebuilt.

What to expect during construction:

  • No interruption to wastewater service.
  • One-lane alternating traffic on Beach Drive SW, with steel plates in the road. Bicyclists should use extreme caution passing through the work area.
  • Lowman Beach Park playground, beach and sidewalks will remain open during construction.
  • Typical construction noise near work areas.
  • Street parking is restricted to construction during the posted hours. Please follow the parking sign instructions.

Project update

April 2026

Murray Pump Station valve replacement work begins May 1

King County Wastewater Treatment Division is replacing valves at the Murray Pump Station in West Seattle. The pump station is located underground on the southeast side of Lowman Beach Park. The contractor has started staging at the park. Preparation for construction will begin on Friday, May 1. Please use caution in the area and follow instructions from the crew.

Construction along Beach Drive SW will begin as early as May 4. Road and park restoration will occur this fall and early winter after the pipe work is complete. 

What to expect in May

  • Work hours: Monday to Friday, 7 am to 7 pm. The contractor may occasionally continue to work at later hours. There will be no noisy activity after 7 pm.

  • No interruption to wastewater service.

  • The sidewalk, most of the park, and the beach will be open.

  • Construction vehicles moving between the Murray Wet Weather Facility and the work area.

  • Temporary fencing at the southeast corner of Lowman Beach Park.

  • Typical construction noise.

Intermittent one‑lane alternating traffic when crews move vehicles and equipment. Flaggers will help direct traffic.

For more information, check out our latest email update: Murray Pump Station valve replacement work begins May 1

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