PROGRESS REPORT: Another six feet for Highway 99 tunnel machine

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.

6 Replies to "PROGRESS REPORT: Another six feet for Highway 99 tunnel machine"

  • WSFam January 4, 2016 (6:30 pm)

    150 ft. That’s one thick wall.

    • WSB January 4, 2016 (6:33 pm)

      The zero didn’t belong. Gone now.

  • 935 January 4, 2016 (6:33 pm)

    “150-foot concrete wall”??
    WOW, that’s some thick concrete!

  • dale January 4, 2016 (7:47 pm)

    I really think the upgrade was over engineered to make up for a deficit for the original bearing design. Lets hope its true.

  • Smitty January 5, 2016 (6:29 am)

    We should start an over/under on the next breakdown.

    I say Feb-25th.

  • Optimistic January 5, 2016 (7:04 am)

    Next “breakdown” will be when they tear it apart at the exit portal on the north end.

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