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SR 99 TBM SR 99 Mining Resumes after Maintenance Stop
TBM News
July 19, 2016
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SR 99 Crews Nearing Planned Maintenance Stop
June 21, 2016
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SR 99 TBM Reaches Half-Mile Mark
June 15, 2016
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Alaskan Way Viaduct Reopens
May 9, 2016
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SR 99 Update: STP Successfully Completes Demonstration Period
March 7, 2016
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SR 99 Update: Bertha Completes 17 Rings

Bertha, the SR 99 tunneling machine, has traveled approximately 110 feet since Seattle Tunnel Partners resumed mining on...

March 4, 2016
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Seattle Tunnel Partners Resumes Mining on SR 99 Tunnel

Seattle Tunnel Partners has received conditional permission to resume tunneling operations on the SR 99 Tunnel Project. ...

February 23, 2016
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WSDOT Suspends SR 99 Tunneling Following Sinkhole

The Washington State Department of Transportation (WSDOT) has notified Seattle Tunnel Partners, the deign-build contract...

January 15, 2016
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SR 99 TBM Advances Out of Access Pit

Bertha, the SR 99 tunneling machine, is now tunneling in Seattle soil after breaking through the access pit wall late We...

January 8, 2016