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Sumner Station Access Improvements

Sound Transit is working to improve access to Sumner Station for pedestrians, bicyclists and drivers, including construction of a new garage adding 505 parking spaces, along with sidewalk and lighting enhancements. This project was approved by voters in 2008 as part of the Sound Transit 2 ballot measure to expand transit in the region.

With two roundtrips added to the Sounder south line in 2017, 13 daily roundtrips now stop at the Sumner station, and ridership has been growing steadily. Parking is usually full early in the morning, and as more people move to the Sumner area and experience the convenience of Sounder trains, ridership is expected to grow continuously in the years ahead.


Project purpose:

Improve access for Sounder riders to Sumner Station

  • Focusing on pedestrian and parking garage improvements within 1/4-mile
  • Focusing on parking lot, vehicle access and bicycle improvements within 1/2-mile

Project goals: 
Sound Transit has worked with city staff, community leaders and stakeholders to develop a set of project goals for the project. These goals provide a framework for developing access improvements.

  • Provide improved access to Sounder riders
  • Benefit the local community
  • Support Sound Transit's regional commitments
  • Maintain a healthy environment

Milestone: In May 2016, the Sound Transit Board selected the project to be built. Access improvements for the project include a new, approximately 623-stall parking garage at the current station parking site, including sidewalk and lighting improvements. An estimated 234 surface-lot spaces located south of Maple Street, north of Maple Street and at the Red Apple building will remain. The garage will bring the new parking total to 857 stalls, or a net increase of 505 stalls. 

Project budget: $52.4 million

Timeline:  The garage is expected to open for public use in 2021. All access improvements will be completed by 2023

  • 2008: Voters approved the Sound Transit 2 providing funding for access improvements at Sumner Station.
  • 2012: Sound Transit completed the Sounder Access Study - which provided a preliminary list of potential pedestrian and bike improvements within a half-mile of the station.
  • Spring 2013: A Leadership Working Group - composed of ST Board members and Sumner Council members - helped establish the goals and evaluation criteria for the project.
  • Early 2014: Sound Transit developed access improvement options for the Sumner Station. Open houses on February 4 and late spring of 2014 gathered input from the public on access improvements. 
  • Summer 2014: On August 28, the Sound Transit Board identified the existing Sumner Station parking lot as a preferred location for improvements.
  • Winter 2014/Summer 2015: Sound Transit held a series of community drop-in sessions to share project updates.
  • Spring 2015: Project team began environmental review process for parking garage.
  • Spring 2016: Sound Transit hosted an open house to share project updates and hear from the community.
  • Spring 2016: In May 2016, the Sound Transit Board selected the project to be built.
  • 2016 - 2019: Preliminary engineering, property acquisition and procurement of a design-build contractor
  • 2019-2021: Final design and construction
  • 2021: Garage operational

Parking improvements
The Sound Transit Board-selected project includes building a garage with 623 spaces (a net increase of 505 spaces).

Additional improvements include:

  • Sidewalk and lighting improvements for people walking and biking to the station