East Montlake Pump Station & Force Main Improvements Project

Rendering of map of upgrades
SPU is upgrading a pump station and force main in East Montlake.

Project Description

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 St.


Pump Station 13 is located in East Montlake Park. East Montlake Park is bounded on the north by the Montlake Cut, on the east by Union Bay, on the south by Washington State Route 520, and on the west by E Park Drive E.

What's Happening Now?

Construction is currently underway for the East Montlake Pump Station & Force Main Improvements Project!

Our contractor has completed the non-excavation force main replacement and installation of the new utility vault on the north side of E Shelby St. Work will continue in the pump station in East Montlake Park for the remainder of this construction project.

As we continue this work, please expect:

  • Parking restrictions on E Shelby St during working hours to allow for commercial vehicles to access the construction site. Please follow directions on the "No Parking" signs.
  • Increased construction traffic, and potential brief blocking of the road as materials are moved

Because of the location, the project team is continuing our work to minimize potential construction impacts to residents, commuters, wildlife, and habitat to the extent possible.

Community 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.

Construction Impacts

Much of the work will occur within the pump station. However, you can expect:

  • Crews to work 8 to 10 hour days Monday through Friday. Work hours and days may vary based on work being preformed, and some night work may be required later in construction.
  • Construction noise, dust, dirt, and vibrations.
  • Increased construction traffic and staging of large equipment and materials near the pump station.
  • Intermittent lane closures near the construction area.
  • Street parking in or near the work area will be prohibited. Please pay attention to onsite signage.
  • Closure of pedestrian path near pump station during construction. Detours will be in place.
  • Crews will install a belowground utility vault in the right-of-way along the north side of E Shelby St. This work will involve some excavation.
  • During non-excavation repair on the force main that runs along the north side of E Shelby St between Montlake Blvd E and the East Montlake Park, crews will install a pipe liner via maintenance access structures and the new utility vault.
  • After work is complete, the contractor will perform surface restoration.

Community Engagement

If you're interested in receiving project updates prior to and during construction, please sign up to receive project email updates.


Mid to Late 2018

  • Project team worked on design and permitting
  • Community outreach about the project

Early to Mid-2019

  • Continue working on project design

Late 2019

  • Finalize design and start preparing for construction
  • Provide project update to the community

Early 2020

  • Pre-construction community notification and outreach
  • Construction work is expected to begin in late April/early May 2020 with mobilization and pre-construction activities starting as soon as mid-April
  • Construction should take about 6 to 10 months
  • Continue updating the community, as needed, during construction

Late 2020

  • Construction completion and final site restoration

*Tentative schedule as of March 2020 assuming that there are no project delays due to the permitting process, weather, or other factors.