The beleaguered concrete pontoons for Seattle's State Route 520 floating bridge are nearing their final fixes. A "coffer cell" -- a 650-ton steel box on a floating dry dock -- will be used for the repairs. "We needed to figure out a way to do the repairs out here and you have to do them in the dry so that's why we have a coffer cell," said Dave Becher, WSDOT's floating bridge project director. Repairing the first four cracked pontoons is estimated to cost $49 million.

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