• Plan ahead: SR 99/Aurora Avenue North closures near South Lake Union, May 8-10

    Travelers should plan ahead for closures on SR 99/Aurora Avenue North between the south end of the Battery Street Tunnel and Valley Street, May 8-10. The Alaskan Way Viaduct will remain open during this time.

    During the closures, crews will connect a new water main under the highway near Harrison Street – a critical step toward building the on- and off-ramp connections for the SR 99 tunnel’s future north portal. Seattle City Light crews will also take advantage of the closure to remove overhead power lines. 

    WSDOT is timing the closures to help Mariners fans get to and from the games that weekend. 

    SR 99/Aurora Avenue North closed between the south end of the Battery Street Tunnel and Valley Street

    • Southbound lanes
      • Closed from 10 p.m. Friday, May 8 to 5 a.m. Sunday, May 10
      • At least one lane will temporarily reopen from 3 – 10:30 p.m. Saturday, May 9

    • Northbound lanes
      • Closed from 11 p.m. Friday, May 8 to 5 a.m. Sunday, May 10
      • Both lanes will temporarily reopen from 8:30 – 10:30 p.m. Saturday, May 9
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  • 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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Program Spotlight

  • Tunnel’s two nerve centers taking shape

    State-of-the-art systems will be the key to maximizing safety and efficiency inside the SR 99 tunnel. Lighting and intelligent transportation systems (video cameras, traffic counters, variable message signs, etc.) will help ensure smooth traffic flow, while the ventilation, drainage and fire-suppression systems will help the tunnel meet the highest safety standards. To manage these systems, we’ll need nerve centers at each end of the tunnel. While they’re hard to see now, those … more