In August 1952, the Dalles Bridge spanning the Skagit River opens. The bridge is located in Skagit County a mile and a half south of Concrete, on the Concrete Sauk Valley Road near the intersection of S Skagit Highway. According to Craig Holstine and Richard Hobbs in
Spanning Washington
, it is the only three-hinged steel through-truss bridge in Washington.
A three-hinged bridge is hinged at each support and at the crown. A through-truss bridge is braced both above and below traffic. The cantilever bridge consists of a 300-foot center span suspended between two anchor spans that are each 75 feet long. The bridge has an arched rib truss (the structural supports are in the shape of an arch designed as an open truss).
The bridge has was designed by the Cecil Arnold and Raymond G. Smith firm of Seattle and built by The General Construction Company of Seattle. The steel in the bridge was fabricated by U.S. Steel in Memphis Tennessee.
The opening of the bridge put two ferries out of business immediately. The structure was placed on the National Register of Historic Places in 2002 (No. 02000323).
