Tacoma Mayor Marilyn Strickland
Tacoma Mayor Marilyn Strickland Chris Tumbusch City of Tacoma
Tacoma Mayor Marilyn Strickland Chris Tumbusch City of Tacoma

We’re fighting for the soul of our city and its future

April 30, 2016 04:28 AM

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  • Building the lower road in Seattle’s new double-deck tunnel

    Seattle’s new SR 99 tunnel has a stacked roadway inside. Crews recently finished pouring the upper southbound roadway. Now the lower northbound road is under construction as shown in this time-lapse footage. Unlike the top deck, the lower surface is built with concrete panels constructed off-site, each one weighing 22 tons. The pre-made panels are trucked into the tunnel, lifted with a specialized crane and joined together to create a functioning highway. The tunnel was created by the huge drilling machine Bertha as part of the $3.2 billion Alaska Way Viaduct Replacement Program that is scheduled to be complete in 2023. Video courtesy of WSDOT.