2005 Washington Aggregates and Concrete Association award winners -- Seattle DJC.COM

Grand Award Winner
Public Works Bridges

 West Trent Avenue Bridge 290/4 Replacement
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

Location: Mile post .37 on state Route 20, Spokane

Owner/developer: Washington State Department of Transportation

Project team: Ross Bros & Company, general and concrete contractor; WSDOT, designer and structural engineer; Central Premix Co., ready-mix supplier

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.
Concrete wall
Concrete walls at the bridge's abutments resemble natural stone.

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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