SR 500 / Thurston Way Design-Build

Washington State Department of Transportation's first ever Design-Build Project, constructing a single point urban interchange at SR 500 and Thurston Way.

Project Details

This design-build project constructed a single point, urban interchange at SR 500 and Thurston Way. Using spliced super girders, the single span bridge has a clear span of 212 feet. Included in the contract was the realignment of 1.58 miles of SR 500, and upgrading the adjacent roadway within the project limits to current safety and construction standards. Other elements of the project included complete design, public involvement, realignment of on/off ramps, and a self directed QA/QC program. WSDOT commissioned an independent review of the project by Dr. Keith Molenaar of the University of Colorado. The Executive Summary states that the Thurston Way Interchange project “…delivered a high quality product, which was delivered on time with minimal cost growth after award.”

Project specs

  • Location: Vancouver, Washington
  • Owner: Washington State Department of Transportation
  • Timeframe: 2001 - 2002
  • Size: $22.9 million