East Marginal Way Corridor Improvement Project

Updated November 9, 2022

What's Happening Now?

If you’d like to receive email or text updates on the East Marginal Way Corridor Improvement Project sign up for emails here and TEXT ‘eastmarginal’ to (206) 222-0105.

Construction expected to begin in 2023

We’ve reached a final design for the north segment of the East Marginal Way Corridor Improvement Project. The project is now advertised for construction contractors to bid on! The community has long awaited this project and we share in the excitement of reaching this major milestone. We appreciate community members’ patience, support, and commitment as the design was developed and informed by public input.

After we hire a contractor, we’ll go through a materials procurement period to purchase items that can have a long lead time. This time frame is dependent on the supply chain, which has seen significant delays since the start of the COVID-19 pandemic.

Once the contractor is on board and we have a better sense of how long materials procurement will take, we’ll set a construction start date and share more detailed information about what you can expect during construction.

Read the latest on the SDOT Blog

Please be sure to sign up to receive email updates and subscribe to receive project text messages by texting ‘eastmarginal’ to (206) 222-0105.

North Segment freight mobility and bicycle safety improvements include:

  • New roadway built to Heavy Haul standards between Jack Perry Memorial Park and S Spokane St
  • Two-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
  • Improved sidewalk on the west side of East Marginal Way S adjacent to roadway reconstruction
  • Replaced water main north of S Horton St
  • Potential relocation of railroad tracks at S Hanford St

View the latest design here.

WSDOT repaving project along East Marginal Way

A Washington State Department of Transportation (WSDOT) repaving project began in summer 2022 to resurface the roadway and add accessibility improvements between Duwamish Ave S and Diagonal Ave S. For more information about this project, please contact Adrienne Hatmaker at HatmakA@wsdot.wa.gov. 

Stay connected

Visit our project library at the bottom of this page to read more about project features and schedule, view our federal grant proposals, and look at 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 fall 2022 and begin construction in 2023.

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.

Project 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 now designed and moving into 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 has reached 100% design and we expect to start construction in 2023.

Graphic showing the location of the north segment

North Segment improvements will reduce conflicts between bicyclists and trucks accessing Port of Seattle driveways and increase safety and efficiency through the corridor. Design improvements include:

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

  • 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

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

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

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

  • 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

Scroll the interactive images from left to right to see current conditions and planned improvements between S Atlantic St and S Spokane St.  

S Handford St and S Horton St

S Horton St and S Hinds St

S Massachusetts St and Alaskan Way S

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 Yes Yes
Central Yes No
South No No

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 funds for North and Central Segment design and North Segment construction

  • Reached 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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