Contents tagged with home

  • April 6 project update: Disassembly continues

    It’s been a busy week since Seattle Tunnel Partners lifted the SR 99 tunneling machine’s front end to the surface for repairs. Crews spent the first few days after the lift cleaning and disconnecting parts. Then, on Friday afternoon, they removed the machine’s bearing block and set it on a platform south of the cutterhead.
    Further disassembly will continue in the coming days, including removal of the main bearing. When the disassembly phase of STP’s repair effort is complete, manufacturer Hitachi Zosen will begin making repairs and enhancements (links to YouTube). You can continue to track STP’s work on our time-lapse cameras and follow @BerthaDigsSR99 on Twitter for updates. Don't forget to check out the other resources we've created to give you a fuller understanding of Bertha's story:
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  • New time-lapse video shows additional perspectives of Bertha lift

    The SR 99 tunneling machine's 2,000-ton front end has been safely on the ground for a couple of days, but it's worth revisiting how it got there. We created a video that shows the Bertha lift from three different perspectives. 

    Watch the Bertha lift time-lapse here (links to YouTube)

    You can continue to track STP’s work on our time-lapse cameras and follow @BerthaDigsSR99 on Twitter for updates. Don't forget to check out the other resources we've created to give you a fuller understanding of Bertha's story:

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  • March 31 project update: Bertha lift complete

    2:35 p.m. update: On Tuesday afternoon, Seattle Tunnel Partners safely placed the front end of the SR 99 tunneling machine on the repair platform located just south of the access pit. The set-down marked the end of a successful lift process that began early Monday. This time-lapse video shows the lift from a spot just north of the tunnel access pit.
    Crews will continue disassembling the machine’s 2,000-ton front end in the coming days, using the massive red crane that completed yesterday’s lift to arrange pieces on the repair site. Repair work will take place south of the pit beneath a large canopy that will soon be moved into place to protect the workers and machine pieces from the elements. 
    This was the fourth and final lift to bring pieces of the tunneling machine to the surface, a process explained in detail in our narrated video (links to YouTube). At 2,000 tons, this was also the largest lift crews undertook. In addition to the cutterhead, the newly removed drive unit section includes motors and parts that enable the cutterhead to rotate. It also houses the main bearing and seal system that will be replaced during repairs.
    You can continue to track STP’s work on our time-lapse camera and follow @BerthaDigsSR99 on Twitter for updates. 


    On Monday, Seattle Tunnel Partners lifted the SR 99 tunneling machine’s front end from the access pit. The lifting process began early Monday morning with a series of tests to ensure the massive red crane performing the lift could handle the weight of the 2,000-ton section. The piece began rising from the pit around noon and was visible at the surface a few hours later. By 9 p.m., crews had positioned the piece above the platform where it will be set down for repairs.

    STP chose to wait until Tuesday morning to complete the lift with a fresh crew. You can track the conclusion of the lift on our time-lapse camera and follow @BerthaDigsSR99 on Twitter for updates.

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  • Take a virtual tour of SR 99 tunnel construction

    Keeping the public informed about our work to replace the Alaskan Way Viaduct is an important part of what we do every day. Our goal is to give you as much access as possible to this amazing project, which is why we regularly post updates, photos and videos of our progress. We even offer walking tours from our information center, Milepost 31, to a viewing platform that overlooks the pit where tunneling began in summer 2013.

    Unfortunately, there’s one frequently received request … more

  • New narrated video explains Bertha repair work

    As reported elsewhere on our website, work to access and repair the SR 99 tunneling machine is coming along. We’ve heard from some people that Seattle Tunnel Partners’ repair plan is hard to picture. Enter STP’s Chris Dixon, who was nice enough to narrate a video that explains what crews are doing to resume tunneling by March 2015. Watch it on YouTube or download a WMV file.

    Other resources 

    Seattle Tunnel Partners repair work plan (pdf 4.8 Mb) … more

  • What we’re doing to keep traffic moving during the four-day SR 99 closure

    We’ve been asking you to do your part to reduce congestion when SR 99 closes for four days starting Friday night, Aug. 22. That includes things like changing your commute habits and choosing an alternate way to get around.

    But what are we, the agencies tasked with keeping traffic moving during this closure, doing to help? Quite a bit, actually. Here’s a roundup of some of the steps we’re taking to help you and your fellow commuters through the closure.

    Washington … more

  • Traffic shift underway on State Route 99 near the stadiums

    Less than three years ago, crews demolished the southern mile of the Alaskan Way Viaduct. When they did, they shifted traffic onto a new section of State Route 99 south of downtown Seattle.

    Much of that new section of SR 99 is permanent, but the piece west of the stadiums is temporary. This curving stretch of road takes drivers around the SR 99 tunnel construction site and connects to the remaining section of the viaduct near South King Street. It’s nothing fancy, but it’s … more

  • Celebrate Bike Month on our new path

    Just in time for Bike Month, we opened a new permanent connection between the on-street bike lanes south of South Atlantic Street and the shared-use path from South King Street. Here’s a map that shows the improvements, which include:

    A dedicated, 14-foot-wide shared-use path with improved paving.

    Improved lighting.

    A separate northbound and southbound path for more efficient navigation.

    Signs warning of vehicles crossing the intersection of … more

  • The SR 99 tunnel contract you’ve never heard of

    You may have noticed more construction along State Route 99, just north of the Battery Street Tunnel. That work is part of the SR 99 Tunnel Project, but it has its own name – the North Access Project. It’s also being built under a completely different contract than the one we have with Seattle Tunnel Partners, the contracting team responsible for most of the tunnel work. A map of major contracts within the program can be found here (pdf 1.1 Mb).

    Our contractor for the North … more

  • SR 99 tunnel’s north portal taking shape near the Space Needle

    A few blocks northeast of the Space Needle, crews are building the north portal of the SR 99 tunnel. It’s a huge piece of the overall tunnel project, but it’s largely invisible to the thousands of people that pass by it every day.

    About the only place you can see the north portal taking shape is from the viewing deck of the Space Needle because most of the construction is underground, inside a pit that’s every bit as impressive as the launch pit where Bertha, the SR 99 … more