East Montlake Pump Station & Force Main Improvements

What & Why

The Montlake 20 basin is a combined sewer basin on the east side of Union Bay. In this area, stormwater and sewage in the basin are collected and flow to Pump Station 13, which is located in East Montlake Park.

During heavy rain events, high volumes of stormwater can overwhelm the pump station causing an overflow into Union Bay, which can be harmful to humans and the environment.

Seattle Public Utilities (SPU) is upgrading the pumping capacity of Pump Station 13 to lessen the occurrence of combined sewer overflows (CSOs).

This work will also upgrade the pump station and connecting pipes, which will minimize the risk of system failure. This involves working on the force main that runs in the right-of-way along the north side of E. Shelby Street.

What’s happening now?

The project is currently in the design phase. Because of the location, the project team is actively working to minimize potential construction impacts to residents, commuters, wildlife, and habitat to the extent possible.

What to Expect During Construction?

Much of the work will occur in or next to the pump station in East Montlake Park. Crews will also perform non-excavation repairs to the section of pipe that goes under E. Montlake to avoid traffic disruptions to the arterial. The section connected to the pump station (marked in red) may require excavation for replacement, but SPU is exploring the option of non-excavation repairs.

Residents can expect construction traffic, noise, dust, and vibrations. In addition, there will be slowed vehicle traffic, temporary lane closures, and parking restrictions in or near the work area.

Construction is scheduled to begin in late 2019, and will take about 6 to 10 months to complete. Prior to construction, the project team will provide updates about the schedule and anticipated construction impacts to the community.

Sign up for updates under Connect on the right-hand side of this webpage to receive project updates.

Project goals and benefits

As part of the Plan to Protect Seattle’s Waterways, SPU will make improvements to Pump Station 13 and the force main along E. Shelby St.

This project will result in:

  • Improvements to sewer infrastructure to reduce the risk of failure.
  • Better water quality through the reduction of combined sewer overflows (CSOs) into Union Bay.
  • Improved working conditions for SPU pump station maintenance crews.
  • Replacement of concrete walkway to meet ADA standards as well as improved landscaping and lighting near the pump station in East Montlake Park.
  • Improved maintenance vehicle access area in East Montlake Park.