I-90 Richards Road to Winery Road VIC Seismic Retrofit

Project Summary

The project provided seismic retrofit improvements to existing concrete and steel bridges along Interstate 90 between Bellevue and Issaquah, Washington. Retrofit improvements included: concrete girder stops, concrete infill walls between bridge piers, concrete bolster add-ons, steel column jacketing, FRP column jacketing, concrete catcher block walls, and demo and replacement of steel cross framing.

Construction included 42,000 square feet of concrete forming, 2,000 cubic yards of poured concrete, and 72 girder stops at 5 different bridges. The project constructed 19 infill walls, ranging from 10 to 28 feet tall and 20 feet wide, and five FRP column jackets. The contract included demolition and replacement of steel cross framing at 14 bents.



King County, WA (Various Locations)


Washington State Department of Transportation

Contract Amount

$6 Million


Washington State Department of Transportation


January 2009 - April 2010