In 2009 and 2010 we completed seismic retrofitting that strengthen the columns, girders and crossbeams of the double-decked overpass that carries I-90 over I-5 in Seattle, and the nearby 12th Avenue S. bridge, which is also known as the Jose Rizal Bridge.
Seismic retrofits help protect drivers, buses and pedestrians on or below bridges during earthquakes. The retrofitted columns are designed to hold the center of the column together and rotate at the top and bottom allowing the bridge to move, but not collapse. Concrete catcher blocks help stabilize the bridge deck with extra support at both ends of the bridge.
These improvements are part of our Seismic Retrofit program. In this program we are strengthening more than 900 bridges and structures across the state to better withstand earthquakes.
- October 2008 – we advertised the project to potential contractors.
- December 2008 – we selected PCL Construction Services, Inc. of Bellevue to be our contractor.
- March 2009 – construction began
- June 2010 – project completed
Seismic retrofits help protect drivers, transit and pedestrians on or below bridges during earthquakes.
Partnerships & Cooperation
Project Engineer: Aleta Borschowa
Phone: (206) 768-5862
Phone: (206) 267-6019
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