Nov. 21 project update: Bertha nearing the tunnel’s deepest point

Posted on Nov 21 2016 2:44 PM
Seattle Tunnel Partners passed the 60 percent mark of tunnel boring last week. As of this morning, crews had mined 5,774 of 9,270 feet and installed 880 of 1,426 concrete tunnel rings. 
 
Bertha, the SR 99 tunneling machine, is located near Virginia Street, between First and Second avenues. With the top of the cutterhead now approximately 210 feet below the surface, crews are nearing the deepest point of the tunnel drive. 
 
STP will continue mining and other construction activities through Wednesday before securing the work zone for the holiday weekend. Work will resume on Monday.
 
Happy Thanksgiving from the Alaskan Way Viaduct Replacement Program team.
 

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