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Structures that last are built on strong foundations. For General Construction, that's not just an engineering principle, it's our business philosophy. |
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Project Details SR520 Pontoon Construction
Project started in December 2010 More than 115,000 vehicles cross the aging SR520 floating bridge between Seattle and Bellevue on a daily basis, and it was imperative that the Washington State Department of Transportation (WSDOT) provide commuters a new, safer and more modern bridge to withstand potential seismic activity and severe weather. Kiewit-General, a Joint Venture (K-G) was selected as the best value contractor to build the pontoons that will support the new roadway superstructure.
K-G and our designers, KPFF and HNTB, are currently completing the design of the casting facility in Aberdeen, WA and assisting WSDOT with the environmental permitting process. Beginning in late 2010, the casting facility will be constructed to support the building of these massive concrete structures. It is anticipated that 80,000 CY of material will be dredged from the harbor at the opening of the casting facility, and approximately 308,000 CY of material will be excavated from the ground site.
The casting facility will be completed in 2012, at which time pontoon construction will begin, with 33 pontoons being built in six cycles. The majority of these pontoons will measure 360 feet by 75 feet, which is greater than the length of a football field. As part of a separate contract, the pontoons will be towed almost 400 miles around the Olympic Peninsula to the bridge site in Lake Washington.
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