Watch WSDOT video tours of massive tunnel construction
The Alaskan Way Viaduct replacement program is edging ever closer to completion, and you can watch.
The Alaskan Way Viaduct is a part of State Road 99. It was built in the 1950s, and due to its age and vulnerability to earthquakes, the Washington State Department of Transportation deemed replacing the viaduct necessary in the interest of public safety. Among other things, the program involves a two mile tunnel beneath Seattle.
Since the project started, WSDOT has been posting time-lapses of the tunnel’s construction on its YouTube channel. Merging construction and education, viewers can get an in-depth look at this massive example of civil engineering. As of the most recent video, Bertha is being disassembled, but construction is not over. The next step is the lower roadway.
It even includes a fascinating virtual tour of Bertha, the five-story Tunnel Boring Machine used to bore the tunnel hundreds of feet underground.
More videos are available on the WSDOT YouTube channel and AlaskanWayViaduct.org
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