Local Information

SR 99 in Seattle to close for four days in late August

Wednesday, July 30, 2014 - 14:02

Laura Newborn, Alaskan Way Viaduct Replacement Program communications, 206-805-2862, 206-639-8577 (mobile)

Crews will demolish a bridge and replace sections of concrete during the longest SR 99 closure in nearly three years

SEATTLE – Get ready, Seattle drivers: Now is the time to plan ahead. There’s only three weeks until the longest closure of State Route 99 since crews demolished half of the Alaskan Way Viaduct in fall 2011.

Both directions of SR 99 will close between South Spokane Street and Valley Street from 10 p.m. Friday, Aug. 22, to 5 a.m. Monday, Aug. 25. The section of SR 99 between Spokane Street and the south end of the Battery Street Tunnel will reopen just before the Monday morning commute, but the highway will remain closed through the tunnel to Valley Street until 5 a.m. Wednesday, Aug. 27.

During the closure, contractor crews working for WSDOT will demolish and replace the section of SR 99 that crosses above Broad Street. This new section of the highway will become part of the permanent connection between the SR 99 tunnel’s north portal and Aurora Avenue North.

Also during the closure, crews will reroute water and sewer lines from underneath SR 99 near Harrison Street, replace 81 damaged or cracked pieces of concrete road panels that make up the SR 99 lanes between South Spokane and South Holgate streets, repair an expansion joint at the northbound SR 99 exit to Seneca Street, and remove ivy from the viaduct.

Closure details

  • At 10 p.m. Friday, Aug. 22, crews will close both directions of SR 99 between South Spokane Street and Valley Street. Northbound SR 99 will be open from South Royal Brougham Way until midnight Friday, Aug. 22 for exiting Seahawks traffic.
  • At 5 a.m. Monday, Aug. 25, crews will reopen both directions of SR 99 south of the Battery Street Tunnel. Both directions of SR 99 will remain closed between the south end of the Battery Street Tunnel and Valley Street.
  • At 5 a.m. Wednesday, Aug. 27, crews will reopen both directions of SR 99 between the south end of the Battery Street Tunnel and Valley Street.

Know before you go

During this critical work, WSDOT encourages drivers to allow plenty of extra time and expect additional congestion on alternate routes including I-5 and surface streets. Drivers should leave early or delay trips to avoid traveling during the peak commute periods, and consider alternative travel modes such as King County Metro, sharing a ride in a car or vanpool, walking or riding a bicycle. WSDOT also has a number of ways to help travelers stay informed during the closure.

  • The Seattle traffic page contains updated road information including links to traffic cameras.
  • The travel alerts website provides real-time information about blocking incidents.
  • WSDOT’s mobile app offers information for travelers on the go.
  • @wsdot_traffic will provide updates about this project.
  • 5-1-1 offers traffic updates.
  • The What’s Happening Nowpage chronicles closures and issues affecting travelers.


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