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The shape and scale of the tunnel boring machine launch pit becomes apparent in August 2012, as crews work hard to prepare for the machine’s arrival. Looking south past the SR 99 tunnel launch pit to the two bridges that were built to replace the Alaskan Way Viaduct's southern mile. This new section of SR 99 opened in September 2012, one year ahead of schedule. Learn more about the program at www.alaskanwayviaduct.org.

SR 99 tunnel launch pit takes shape

Thu, Nov 15, midnight 2012

by WSDOT

The shape and scale of the tunnel boring machine launch pit becomes apparent in August 2012, as crews work hard to prepare for the machine’s arrival. Looking south past the SR 99 tunnel launch pit to the two bridges that were built to replace the Alaskan Way Viaduct's southern mile. This new section of SR 99 opened in September 2012, one year ahead of schedule. Learn more about the program at www.alaskanwayviaduct.org.

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