Bridge Seismic Program
What is the Bridge Seismic program?
Earthquakes could have a major impact on Seattle's bridges. To address this risk, the City of Seattle established a bridge seismic program to assess how vulnerable the City's bridges were to earthquakes and reinforce bridges to withstand the potential impacts of an earthquake.
As part of the Levy to Move Seattle, we committed to seismically reinforcing 16 vulnerable bridges.
What is a Bridge Seismic Retrofit?
In a seismic retrofitting project, SDOT modifies a bridge’s components and reduces its vulnerability to earthquakes. We do not change the current use and operation of the bridges.
Typical modifications include:
- Repairing cracks and damaged concrete
- Installing concrete blocks and supportive shells for the bridge's columns and crossbeams
- Strengthening the existing arch with a concrete infill wall
- Installing carbon fiber wrapping to the bridge's crossbeams, columns, and arches
- Replacing the expansion joints at both ends of the bridge
Possible modifications SDOT can make during a bridge seismic improvement.
Bridge Seismic Retrofit Locations
To learn more about an individual project, click on the project name below to visit its project webpage:
Active Seismic Retrofit Projects:
- 13th Ave NW/Holman Rd NW Pedestrian Bridge
- 15th Ave NE/NE 105th St Bridge
- 15th Ave NW/Leary Way Bridge
- 45th Ave NW Pedestrian Bridge
- Admiral Way North Bridge
- Admiral Way South Bridge
- Delridge Pedestrian Bridge
- Lower Spokane St Swing Bridge Silt Removal
- McGraw St Bridge
- N 102nd St/Aurora Ave N Pedestrian Bridge
- N 41st Ave Pedestrian Bridge
Completed Seismic Retrofit Projects:
- 8th Ave NW/NW 133rd St Bridge
- Cowen Park Bridge
- SW Andover St Pedestrian and Bicycle Bridge
- W Howe St Bridge
Materials
Funding
From 2016 through 2024, the Bridge Seismic Program is funded by $67 million in Levy to Move Seattle dollars, as well as an additional $14 million of other funds.
Translations
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