Transit alert! Approximate two-week closure of the Alaskan Way Viaduct starts April 29

Beginning Friday, April 29, the SR 99 Alaskan Way Viaduct will be closed for approximately two weeks as a precautionary measure while Bertha, the SR 99 tunneling machine, travels beneath the structure. The viaduct will be closed between the south end of the Battery Street Tunnel and the West Seattle Bridge. For the most up-to-date information, visit

Make a travel plan and expect additional congestion throughout the region

This closure will disrupt local and regional traffic patterns. WSDOT is coordinating with other transportation agencies to keep people moving through a variety of measures, but is expecting the closure to increase traffic congestion regardless. We are asking travelers in Seattle and the surrounding region to plan ahead and consider adjusting their travel habits to help us keep people moving on highways and city streets. We recommend that you:

  • Allow plenty of extra travel time and expect rush hour congestion to start earlier and end later.
  • If possible, consider leaving early or delaying your trip to avoid traveling during peak times. Know before you go and check out the travel resources page so you can make informed travel choices during the closure.
  • Consider working from home if you can, to avoid commuting altogether.

Need help making a travel plan?
Take a look at this travel alternatives handout for a detailed list of resources and options for changing your commute.

Stay up-to-date
For the latest information regarding traffic conditions and tunneling progress:
*Bookmark the official website
*Check Twitter for major traffic and project alerts: @BerthaDigsSR99, @WSDOT_Traffic, @SeattleDOT, @KCMetroBus, @SoundTransit, @MyCommTrans, #99closure
*Contact us at or 1-888-AWV-LINE (298-5463)


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