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Air vents atop the north portal of the SR 99 tunnel. (WSDOT) A graphic showing how the north portal will be configured. (WSDOT) The new SR 99 tunnel. (WSDOT) A view from atop Bertha looking behind the machine in February 2017. (WSDOT) The new SR 99 tunnel. (WSDOT) A sinkhole formed on the surface in Bertha's wake shortly after it began boring again in January 2015. (Jillian Raftery) Crews bolt together ring segments to form the walls of the SR 99 tunnel. (WSDOT) A drainage system is installed in the new SR 99 tunnel. (WSDOT) Bertha is expected to emerge through this concrete wall when it reaches at the north end of the SR 99 portal. (WSDOT) The new SR 99 tunnel. (WSDOT) The top deck of the new SR 99 tunnel is constructed. (WSDOT) The top deck of the new SR 99 tunnel is constructed. (WSDOT)
New SR 99 tunnel – North Portal