Casting basin in Washington state created to build bridge pontoons

05/3/2011 | Bellevue Reporter (Wash.), The

The process of replacing the State Road 520 floating bridge with new concrete pontoons in a $367 million project has begun. The current bridge across Lake Washington is aging and vulnerable. In order to build the 33 pontoons needed for the span, crews are excavating more than a quarter-million cubic yards of dirt for a casting basin.

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Bellevue Reporter (Wash.), The

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