Six and a half feet and one more ring for the Highway 99 tunnel machine, WSDOT announced late today. That puts its cutterhead close to the north side of the access pit, where it will have to go through a 15-foot concrete wall: “Once beyond the wall, crews will begin tunneling through native soils that will serve as the next stage of STP’s testing process. This section of the tunnel route includes an underground wall that was built to protect the Alaskan Way Viaduct while crews continue to test the machine.” Read the rest of the update here, including details of how the removal of excavated material has resumed.
West Seattle, Washington
19 Friday
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