Pontoons to be retrofitted for $4.13B Seattle bridge project

03/11/2013 | Engineering News-Record

Due to the design flaw that caused cracks in the first concrete pontoons built for Seattle's new State Route 520 floating bridge, all pontoons under construction, and those already built, will need to undergo new "transverse post-tensioning for end walls and bolt beams," according to this article. The revisions could delay completion of the $4.13 billion project and eat into the $250 million contingency fund. The cost of the repairs is unclear.

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