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A sea of concrete tunnel segments | by WSDOT
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A sea of concrete tunnel segments

The storage yard of the EnCon casting facility in Frederickson, Wash., teems with reinforced concrete segments that will be connected to form the outer walls of the SR 99 tunnel. Each segment must be tested, inspected and approved before making the trip to the tunnel construction site in Seattle. Learn more about the Alaskan Way Viaduct Replacement Program at or follow Bertha on Twitter @BerthaDigsSR99.


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Taken on September 12, 2013