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SR-520 Evergreen Point Floating Bridge and Landings Design-Build Project

SR-520 Evergreen Point Floating Bridge and Landings Design Build Project

Challenge Design-Build Project Delivery Addressed:
The Washington State Department of Transportation (WSDOT) considered traditional delivery options but decided that the design-build model was a perfect fit for this project because design-build did several things: it allowed fast-track delivery of the new bridge replacing a vulnerable structure, it allowed greater innovation and potential cost savings to WSDOT, and it shifted appropriate project risk components to the design-builder.

Summary:
The SR 520 Floating Bridge and Landings Project designed and built the world’s longest floating bridge, creating a safer, more reliable link between Seattle and the growing high-tech cities east of Lake Washington. With HOV lanes, full shoulders for disabled vehicles, a cross-lake bicycle and pedestrian path, and the largest, heaviest, and strongest bridge pontoons ever built, the new, 1.5-mile-long floating highway dramatically improves the movement of people and freight in the Central Puget Sound region.

 

Design-Build Team
Client/Owner Washington State Department of Transportation
Design-Builder Kiewit/General/Manson, A Joint Venture
General Contractor Kiewit/General/Manson, A Joint Venture
Architect Helix Design Group
Engineers KPFF Consulting Engineers, BergerABAM
Specialty Consultants International Bridge Technologies, Wood Harbinger
Other Team Members IBI Group, Hart Crowser, Geo Engineers, Floyd|Snider, WSDOT, HDR, EnviroIssues, Parametrix, Parsons Brinkerhoff
Duration of Construction: 56 months
Project Cost: $763,548,129