• Traffic alert: Rolling slowdowns on the viaduct May 19-26

    Drivers on northbound SR 99 should plan ahead for daytime slowdowns over the next week as a movie is filmed on the Alaskan Way Viaduct. The production will film on the northbound deck the viaduct between South Atlantic Street and Western Avenue. Traffic will not be stopped, but there will be rolling slowdowns as filming moves along the structure. The slowdowns will occur during the hours listed below:

    • Thursday, May 19 - 9 a.m. to 3 p.m.
    • Friday, May 20 - 9 a.m. to 3 p.m.
    • Saturday, May 21 - 7 a.m. to 3 p.m.
    • Sunday, May 22 - 7 a.m. to 8 p.m.
    • Wednesday, May 25 - 9 a.m. to 3 p.m., and 7 p.m. to 8 p.m.
    • Thursday, May 26 - 9 a.m. to 3 p.m.

    Visit the Seattle Department of Transportation's blog for additional information about the film production.

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  • May 18 project update: Bertha passes 2,000-foot mark

    Seattle Tunnel Partners resumed mining late Tuesday evening following a break for rest and routine maintenance.
    Bertha has now installed 300 concrete tunnel rings and traveled more than 2,000 feet from the launch pit west of the stadiums. Her journey is more than 20 percent complete. She is approaching the start of Zone 3, which will take her beneath the Columbia Street on-ramp to the viaduct and, later, beneath Western Avenue. Look for twice-weekly updates on the Follow Bertha page.
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  • May 11 project update: Bertha fully beyond Alaskan Way Viaduct

    Bertha’s passage beneath the Alaskan Way Viaduct has officially come to an end, but Seattle Tunnel Partners has decided to continue mining a bit farther before taking a short break.
    By early Wednesday morning, crews had tunneled 385 feet since the underground maintenance stop near Yesler Way. That put them clear of the fourth and final viaduct column the machine had to pass to complete its journey under the elevated structure. STP decided to mine beyond 385 feet in order to reach a better location for the machine to stop while crews take a few days to rest after mining around the clock since April 29. 
    SR 99 was closed for 10 days while Bertha tunneled beneath the viaduct. WSDOT reopened the highway on Sunday evening based on STP’s tunneling progress and the continued stability of the ground and viaduct. Monitoring of the structure and ground will continue throughout the remainder of the tunnel drive.  
    Look for another progress update next week.

    Recent updates 

    For earlier program updates, please visit our archive page.


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Program Spotlight

  • Inside tunneling under the viaduct

    After nearly a week of tunneling under the Alaskan Way Viaduct, crews are steadily continuing Bertha’s underground drive towards downtown Seattle. This video gives you a behind-the-scenes glimpse into how the new tunnel is being built, showcasing the complex operations involved in this project. Massive concrete ring segments are transported to Bertha’s segment erector where they are lifted into place, allowing the machine to push forward while the excavated soil is transported … more