May 31 project update: Tunnel boring 25 percent complete

Posted on May 31 2016 5:12 PM

As of May 31, Seattle Tunnel Partners crews have tunneled a total of 2,314 feet. Tunnel boring is now 25 percent complete.

Bertha is located in zone 3 of the tunnel drive . The top of the machine is approximately 105 feet below the surface, approaching Marion Street.

Look for another progress update on Thursday.