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February 10, 2025

National Finalist: Gold Award
Structural Systems

Photo from ACEC Washington [enlarge]
The new bridge was built on the original alignment, creating safe, accessible access to Colman Dock, the waterfront and downtown.

HDR

Marion Street Pedestrian Bridge Replacement

Seattle Department of Transportation

Colman Dock, located on Seattle’s waterfront, is one of the world’s busiest ferry terminals, with more than 10 million annual passengers.

Connecting Colman Dock to Seattle is the Marion Street Pedestrian Bridge. A hallmark of downtown Seattle for over a century, the original timber trestle was replaced in the 1950s with one threading through the Alaskan Way Viaduct. With the viaduct’s removal in 2019, the city of Seattle sought to replace the aged, narrow and seismically vulnerable structure with a modern, elegant one.

This new design creates safe, accessible access to Colman Dock, the waterfront and downtown, becoming an icon on the revitalized waterfront. The Marion Street Pedestrian Bridge Replacement removed the existing span attached to the Commuter Building, demolished the temporary bridge that wrapped around Columbia Street and Western Avenue, and constructed a new bridge on the original alignment.

The new structure replaces half the original bridge between the Colman Dock Ferry Terminal and First Avenue. The remaining original bridge will be replaced when additional funding is available. The project included repaving Marion Street between Alaskan Way and Western Avenue, bridge trench drains, and rail and aesthetic lighting.

Completed in stages to take advantage of adjacent projects, construction began with the mainspan shafts on September 5, 2019. The main contract started on July 18, 2022. The bridge was substantially completed and opened November 10, 2023, with work thereafter extending the railing onto the existing bridge.


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