Crooked River Bridge
Terrebonne, Oregon
Somerset Engineering Group provided construction engineering services for the new bridge that spans the Crooked River Gorge, 300 feet above the river. The four-lane, 410-foot clear span bridge is the first major cast-in-place segmental concrete arch bridge in the United States and a marquee project for the Oregon Department of Transportation. It will carry the traffic diverted from the 1926 steel arch bridge designed by legendary engineer, Conde B. McCullough.
 The segmental cast-in-place arch was designed so it could be built using tiebacks from a temporary tower. Prior to contract award, Somerset established that using an 800-foot cableway to construct the bridge was more economical than using cranes from each bank. Once the project was awarded, Somerset performed all of the construction engineering for the arch geometry, cantilever stresses and tieback forces. The firm also provided the engineering for the cableway, which was installed by its parent company, KWH Constructors. The project was completed in September 2000.
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