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June 8, 2009
Contract for bridge pontoons coming up
Pontoons for the new SR 520 bridge will cost up to $500 million to build.
WSDOT will build a mock-up, shown in the shaded area, to find the best concrete mix and forming techniques for the new SR 520 bridge pontoons. The main pontoons each will span the length of a football field.
The Washington State Department of Transportation is seeking a design-build contractor to develop a pontoon production facility and construct 33 concrete pontoons. On June 22 the agency will issue a request for qualifications for the project, which is estimated to cost between $300 million and $500 million.
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