East Marginal Way Corridor Improvement Project

Updated August 17, 2022

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Construction expected to begin later this year

We submitted 90% design plans for the North Segment in early April 2022. We expect to reach final design this spring and choose a contractor for the project in the fall. Construction of the North Segment will start as early winter 2022.

North Segment freight mobility and bicycle safety improvements include:

  • 2-way protected bike lane on the east side of the street
  • Rebuilt traffic signal at S Hanford St and new signal at S Horton St
  • New roadway built to Heavy Haul standards between Jack Perry Memorial Park and S Spokane St
  • Rebuilt sidewalk on the west side of East Marginal Way S adjacent to roadway reconstruction
  • New water main north of S Horton St
  • Potential relocation of railroad tracks at S Hanford St

View the updated 90% design here.

View the North Segment factsheet here

Stay connected

Visit our project library at the bottom of this page to read more about project features and schedule, review our federal grant proposals, and look at detailed design plans. Comments and questions are welcome by emailing EastMarginal@seattle.gov or calling (206) 257-2263.

Overview

As Seattle grows, improvements to freight mobility are essential to promote regional and international economic competitiveness. East Marginal Way is a major freight corridor that provides access to the Port of Seattle terminals, rail yards, industrial businesses, and between local Manufacturing and Industrial Centers (MIC's). It is also a designated Heavy Haul Route, critical last-mile connector, and vital route for over-sized trucks or those carrying flammable cargo. In addition, the corridor provides a major connection for people who bike between the West Seattle Bridge Trail, downtown, and the SODO neighborhood.

This project will:

  • Improve safety and reliability in the movement of people and goods

  • Support freight loads by rebuilding East Marginal Way S to heavy haul standards

  • Promote efficiency through signal modifications, improving wayfinding and lighting, and intelligent transportation systems

  • Improve safety by separating non-motorized modes of traffic from vehicle traffic  

Click here to view the latest design overview of the North Segment. The project is expected to reach final design in spring 2022 and begin construction in winter 2022.

Benefits

  • Safety - Improved access and multimodal connections for all corridor users. Separated facilities for people walking and biking to reduce potential conflicts.
  • Freight mobility - Support the economic vitality of our region by making it easier for freight to access the Port of Seattle and local industrial businesses.
  • Efficiency - New and updated facilities for people walking and biking will improve access for transit. Signal modifications and intelligent transportation systems (ITS) will optimize travel for all corridor users.

Segments

This project extends along East Marginal Way S from S Atlantic St to 1st Ave S. The project is divided in three segments – North, Central, and South. Each segment is moving at its own schedule based on funding we have secured for design and construction. The North Segment of the East Marginal Way S project is fully funded for both design and construction. The Central Segment is funded for design and unfunded for construction. The South Segment is unfunded for design and construction.

Map showing 3 segments of the project

Select each segment below for more information about the design and schedule.

East Marginal Way Segments

North Segment

The North Segment runs from S Atlantic St to S Spokane St. It is fully funded for both design and construction and we expect to start construction as early as winter 2022. 

Graphic showing the location of the north segment

Design includes:

  • Protected bike lane separating non-motorized modes from freight traffic on the east side of East Marginal Way S between S Atlantic St and S Spokane St

  • Multi-use path on the west side of the street between S Horton St and S Spokane St

  • New signalized diagonal bicycle crossing at East Marginal Way S and S Horton St

  • New bike crossing with rapid flashing beacon (RRFB) at East Marginal Way S and S Massachusetts St

  • Reconstructing the East Marginal Way S roadway to heavy haul standards from approximately S Massachusetts St to S Spokane St

  • Replacing the existing water main in areas where the roadway will be reconstructed north of S Horton St

  • Rebuilding the sidewalk on the west side of East Marginal Way S adjacent to the roadway reconstruction north of S Horton St

  • Rebuilding the intersection and existing traffic signal at East Marginal Way S and S Hanford St

  • Redesigning driveway at Terminal 25 South to improve visibility for people biking and driving

  • Dynamic message sign at S Alaska St and East Marginal Way S

  • Weigh-in-Motion system to help SDOT better understand wear and tear on our roadways and replace current spot-check enforcement system

  • Revised curb radius with a truck apron at S Spokane St

Below are cross-sections of the 2-way protected bike lane between S Holgate St and S Horton St and the multi-use path between S Horton St to S Spokane St. These images show recommended project design based on the public’s desire to reduce conflicts between people riding bikes and trucks accessing Port of Seattle driveways.

Graphic showing the cross sections

S Hanford St intersection

Graphic showing the S Hanford St intersection

Protected bike lane crossing design at S Horton St

Graphic of S Horton St

Central Segment

The Central Segment run from S Spokane St and Diagonal Ave S. It is funded for design and unfunded for construction. We will continue to pursue funding opportunities to construct the Central Segment.

This project aims to upgrade the Heavy Haul network, provide a clear route through the confusing area between S Spokane St and Diagonal Ave S, and construct a shared use trail to separate people walking and biking from motor vehicle traffic.

Freight improvements proposed in the Central Segment include reconstructing the surface street of East Marginal Way S to heavy haul standards between S Spokane St and Duwamish Ave S, improving wayfinding and lighting, and a Weigh-in-Motion system for northbound traffic at Duwamish Ave S. At the intersection of Diagonal Ave S, this project plans to realign the southwest corner to improve the turning radius for eastbound trucks making a right turn.

Our proposed design includes a shared use path west of the SR-99 viaduct on the east side of East Marginal Way S south of S Spokane St. At approximately mid-block, the path will cross to the west side of the street at a marked crosswalk, where it will continue to Duwamish Ave S. People walking and biking will use a marked crosswalk with flashing beacons to cross Duwamish Ave S and continue on the west side of East Marginal Way S past the concrete plant. The project will continue a wide shared use trail south to Diagonal Ave S.

Graphic of the Central Segment

South Segment

The South Segment runs from Duwamish Ave S to 1st Ave S. It is unfunded for both design and construction. We will continue to pursue funding opportunities to advance the South Segment, but currently do not have a schedule for this portion of the project.

The South Segment, from Duwamish Ave S to 1st Ave S, is part of State Route 99. There are no existing bike facilities or sidewalks on the west side of the street and sections of missing sidewalks on the east side of the street.

In March 2018, we completed a preliminary design for the South Segment that included:

  • Pedestrian improvements at each existing traffic signal
  • Constructing missing sidewalks on the east side of the street
  • Bus stop improvements
  • Signal enhancements where appropriate to improve predictability and safety for people walking and biking

We also developed a proposal to improve pedestrian and bicyclist connectivity to the 1st Ave S bridge. Design and construction of the South Segment is currently unfunded. We will continue to pursue funding opportunities to advance the South Segment, but currently do not have a schedule for this portion of the project.

East Marginal Map South Segment
Click to enlarge

Benefits

Funding

Funding to evaluate alternatives and complete early design was provided by the 9-year Levy to Move Seattle, approved by voters in 2015. Learn more about the levy at Levy to Move Seattle website. In 2019, we secured grants from Transportation Improvement Board (TIB) and Federal Highways (FHWA) to complete full design for the north and central segments. In November 2021, we secured remaining grant funding to construct the North Segment of the project. North Segment funding partners include:

  • Freight Mobility Strategic Investment Board (FMSIB)
  • Transportation Improvement Board (TIB)
  • Port of Seattle
  • Federal Highways (FHWA) funds from PSRC and RAISE

We continue to look for funds for construction of the Central Segment and to advance the South Segment design. Opportunities include state funding for highways and for non-motorized facilities, FMSIB, and other local transportation packages.

Segment Design Funding Construction Funding
North Fully Funded Fully Funded
Central Fully Funded Unfunded
South Unfunded Unfunded

Schedule

This project began in 2015 and has advanced project planning and design through consistent engagement with community members, businesses, partner agencies, and community advocacy groups. We have secured funding to construct the North Segment of the project and expect to begin construction in late 2022. Construction of the Central and South Segments will depend on identifying funding sources.

Schedule graphic

Planning phase (2015 - 2016)

  • Data collection and preliminary traffic analysis

  • Early design workshops

  • Community engagement through online open house and survey

Design phase (2017 - present)

  • North Segment design

  • Freight and bike community engagement survey

  • Briefings to community groups and bike detour workshop

  • Coordination with railroad agencies

  • Secured funding for North and Central Segment design and North Segment construction

  • Expect to reach final design of the North Segment in summer 2022

  • Pre-construction outreach to businesses

Construction of North Segment (Expected 2022 - 2025)

  • Expect to begin construction in winter 2022

  • Community outreach during construction

  • Expect to complete construction by early 2025

    Public Engagement

    We are committed to keeping you informed and involved throughout this project. We are planning engagement opportunities later this year once we select a contractor for North Segment construction.

    Your questions and comments are always welcome by sending us an email at EastMarginal@seattle.gov or calling (206) 257-2263. To request a briefing for your organization or for more information, please send an email to EastMarginal@seattle.gov.

    Project Materials

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