East Marginal Way Corridor Improvement Project

North Segment

The North Segment runs from S Atlantic St to S Spokane St. 

North Segment improvements will reduce conflicts between people biking 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

Planned improvements: S Atlantic St to S Massachusetts St

Planned improvements: S Hanford St to S Horton St

Planned improvements: S Horton St to S Spokane St

Central Segment

The Central Segment runs from S Spokane St and Diagonal Ave S. We have completed 90% design and the Central Segment is on pause while we pursue additional design and construction funding opportunities.

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
• Installing a Weigh-in-Motion system for northbound traffic at Duwamish Ave S
• Realigning the southwest corner of Diagonal Ave S and East Marginal Way S to improve the turning radius for eastbound trucks making a right turn
• Adding a new shared-use path for people walking, biking, and rolling starting south of S Spokane St and continuing to Diagonal Ave S. Due to space constraints, the shared-use path will begin on the east side of the street and then transition to the west side of the street with a marked crosswalk.

.

South Segment

The South Segment runs from Duwamish Ave S to 1st Ave S, and is unfunded for both design and construction. We completed a preliminary design and will continue to pursue funding opportunities to advance the South Segment.

The South Segment 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
• Improve pedestrian and bicyclist connectivity to the 1st Ave S bridge

Click to enlarge