Repair Work to Delay Float-Out of Pontoons

Seattle, WA- With the heavily planned and much anticipated 520 floating bridge pontoon construction project underway the Washington State Department of Transportation are now facing a delay of the float-out of SR 520 bridge pontoons built in Aberdeen after damaged concrete was discovered.

Work is planned on four of the six concrete pontoons under construction in Aberdeen and is preliminarily expected to take four to six weeks to complete. As a result, the completed pontoons are not expected to be towed out of the casting basin until July or August, depending on favorable tides. 

The Washington State Department of Transportation is working with contractor Kiewit-General to analyze the cause of the damage “We have a plan, and by making these repairs and modifications before the pontoons leave Aberdeen, we can assure that the new SR 520 floating bridge will safely carry traffic for 75 years or more,” said Julie Meredith, WSDOT SR 520 program director.

The damage was discovered May 11th after construction crews completed post-tensioning on a longitudinal pontoon measuring 360 feet long, 75 feet wide and more than 28 feet tall. Crews plan to de-tension the steel tendons, remove concrete and add steel rebar reinforcement needed to contain the steel tendons. 

WSDOT and contractor KG are focused on making the modifications carefully and swiftly, but say it is too early to say how much the repairs will cost or how costs will be assigned.