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Grand Award Winner |
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Piers for the West Trent Avenue Bridge were designed to deflect the Spokane River's flow. Photos courtesy WSDOT West Trent Avenue Bridge 290/4 Replacement |
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Location: Mile post .37 on state Route 20, Spokane
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The replacement for the West Trent Avenue Bridge is a cast-in-place, post-tensioned bridge. It was designed to complement four contemporary and four older concrete arch river crossings in the downtown Spokane area.
The 500-foot bridge has a complex roadway geometry, including a 650-foot horizontal radius curve ending in a tangent section. Spans vary in depth from 6 to 12.5 feet. Cast-in-place concrete was needed to create the bridge’s parabolic-shaped superstructure soffit. River piers supporting the bridge were cast in shapes to deflect water flow. They are hollow with Styrofoam formwork inside. The old bridge had to be continuously supported during demolition. |
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