Advisories/Updates

  • Two weeks left to take a viewing platform tour on the viaduct

    Our information center in Pioneer Square, Milepost 31, is closing its doors on Saturday, November 25, after a highly successful six-year run.

    One of Milepost 31's roles has been as the starting point for viewing platform tours. These free tours take small groups onto a closed section of the viaduct that overlooks the tunnel's future south portal. The view from that perch has changed substantially over time. We installed a camera and captured a time-lapse video of five years of construction from this unique perspective.

    It's not too late to see this view in person!

    Milepost 31 is offering guided viewing platform tours this week and next. We run tours at noon Tuesday-Saturday, with an additional 3 p.m. tour on Saturday. The center will be closed on the Thursday and Friday of Thanksgiving weekend.

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  • Contest: Share your viaduct memories to commemorate Milepost 31

    At the end of November, our Milepost 31 information and tour center in Pioneer Square is closing its doors. We are celebrating the visitor center and the many people who helped make it possible with a final celebration and speaker series on Thursday, Nov. 2.

    Crowd gathered on sidewalk outside Milepost 31

    To commemorate the center, we’re asking you to share your favorite memory or photo of the Alaskan Way Viaduct. Participants will be entered in a contest that starts today and runs through Friday, Nov. 10. Five participants will be randomly chosen and invited on a special tour that will go into the new SR 99 tunnel.

    Here is how you can enter the contest:

    1. Visit Milepost 31 and take our trivia challenge. Submitting your answers will give you one entry into the drawing.
    2. On Twitter, share your favorite viaduct memory or photo. Use the hashtag #Byeaduct and tag us (@BerthaDigsSR99). This will give you one entry into the drawing.
    3. Don’t use Twitter? You can email us your photo or viaduct memory to viaduct@wsdot.wa.gov, with the subject line “Viaduct memory.”


    Remember: safety first; do not Tweet us or take a photo while driving!

    We will conduct the drawing on Monday, Nov. 13, and notify winners via email or Twitter direct message, with the tour planned in early December. Winners will be able to bring an additional person on the tour (everyone must be 18 years of age or older).

    For six years, Milepost 31 has told nearly 80,000 visitors the story of the land that became Pioneer Square and the transformative program that is replacing the Alaskan Way Viaduct. Thank you to the visitors from Seattle and around the world who helped make Milepost 31 possible. We appreciate your support over the past six years.

    Full contest rules

    • All submissions must be entered between Thursday, Oct. 26 and Friday, Nov. 10.
    • Twitter submissions must include #Byeaduct and tag the @BerthaDigsSR99 handle.
    • Email submissions must be sent to viaduct@wsdot.wa.gov with the subject line “Viaduct memory.”
    • Trivia sheets must be submitted in person at Milepost 31.
    • Participants can earn a maximum two entries, one in person and one online.
    • Participants may earn one entry by submitting a trivia sheet at Milepost 31. Submitting multiple sheets will not increase your chance of winning.
    • Participants may earn one entry by participating via Twitter or email. Submitting via both Twitter and email, or multiple entries via either method, does not increase your chance of winning.
    • Do not take photos of the viaduct, or anything else, while driving.
    • Winners will be selected randomly from the entire pool of entrants.
    • After the drawing we will contact winners via email or Twitter direct message. Winners have five days to RSVP or they will lose their spot and we will randomly draw a new winner.


    Tour requirements

    • All tour participants must be 18 years or older.
    • No Alaskan Way Viaduct Replacement Program employees, consultants or contractors are eligible.
    • The job site tour is within an active construction zone. All tour participants must be able to climb up and down eight flights of stairs and walk long distances, sometimes over uneven ground.
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  • Fly the SR 99 tunnel – from the Space Needle to the stadiums

    Today we are excited to share a drone's-eye view of two miles of tunnel in two minutes. This video captures the ongoing construction of the interior roadways, safety systems and other elements that will carry and safeguard drivers passing beneath downtown Seattle in the new SR 99 tunnel.

    The drone enters at the tunnel’s north end, near Seattle Center. Crews are building the tunnel’s interior structures starting from the south, so as the drone advances the tunnel becomes more complete. The drone flies along the tunnel's upper deck, which is 85% built. At the tunnel’s south end, the drone passes from the bored section of the tunnel (9,270 feet long and dug by Bertha, the tunneling machine) and into the cut-and-cover section, built in the launch pit where Bertha began her tunnel drive.

    One big tunnel element not seen in this video is the tunnel’s lower deck. In early November, the tunnel contractor Seattle Tunnel Partners plans to begin delivering large, prefabricated roadway panels to build that deck (the future northbound roadway). You can track progress on that and other tunnel elements on our tunnel progress tracker.

    There’s much work still to come in building the tunnel’s interior roadway and completing systems like ventilation, sprinklers and traffic cameras. We’ll continue to share and document crews’ progress building the tunnel on in our Flickr albums and on Twitter

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Program Spotlight

  • Tunnel’s lower deck arriving in Seattle piece by piece

    This week precast panels of the SR 99 tunnel’s lower deck are arriving in Seattle. This marks the beginning of an important stage of tunnel construction.

    The upper deck of the tunnel’s double-deck highway has been under construction for some time; it was more than half complete by the time the tunneling machine Bertha finished mining in April. The contractor, Seattle Tunnel Partners, is building the upper deck and most of the tunnel’s other interior structures using the … more