SR 99/Aurora Avenue North closed this weekend near South Lake Union

Posted on Aug 18 2015 10:02 AM

Crews working for the Washington State Department of Transportation will close State Route 99/Aurora Avenue North near South Lake Union from Friday night, Aug. 21 through Monday morning, Aug. 24. Travelers should plan ahead and prepare for additional congestion on nearby streets during this time. We urge you to “know before you go” and use WSDOT’s travel tools or SDOT’s traveler’s information web page. Scroll down for complete closure details.  

During the closure, crews will move the northbound and southbound lanes of SR 99 near Harrison Street onto a new structure to the west of the existing highway. Shifting traffic to these new lanes will provide space for ongoing construction of the SR 99 tunnel’s future north portal. SR 99 will remain two lanes in each direction in this area.  

Map of traffic shift
Click map to enlarge
Shifting traffic to this new section of SR 99 is an important milestone for the SR 99 Tunnel Project. Check out our video for a better understanding of what the future will look like at the tunnel’s north portal. 

A new section of SR 99: More than just a traffic shift (YouTube)
SR 99 closure details
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, Aug. 21 to 5 a.m. Monday, Aug. 24.
  • Northbound lanes closed Friday, Aug. 21 staring two hours after the Mariners game to help fans get home from the game. All lanes will reopen by 5 a.m. Monday, Aug. 24. 


Aurora Bridge

  • WSDOT crews will close up to two lanes of northbound SR 99 across the Aurora Bridge for bridge maintenance work from 5 a.m. to 5 p.m. Saturday, Aug. 22. Up to two lanes of southbound SR 99 across the bridge will be closed from 5 a.m. to 5 p.m. Sunday, Aug. 23.


Changes to Harrison Street at SR 99 starting Aug. 24
  • Drivers will no longer be able to enter northbound SR 99 via westbound Harrison Street. This closure will allow crews to complete additional work over the next several months. Access to northbound SR 99 from Thomas and John streets will remain open.  
  • Northbound drivers on SR 99 will be able to exit at Harrison Street as they do today.
Please contact us at or 1-888-AWV-LINE (298-5463). 
Originally posted July 28

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