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CityLink Seattle

SR 99 Full Weekend Closure October 4-7

The Seattle Department of Transportation (SDOT) reminds travelers of the upcoming weekend closure of SR 99 on October 4-7 for construction activities associated with the West Phase of the Mercer Corridor Project. Please note, this closure is being coordinated with the Washington State Department of Transportation for their semi-annual inspection of the Alaskan Way Viaduct.

SR 99 full weekend closure: Friday, October 4, through Monday, October 7

Beginning tomorrow evening through Monday morning, Mercer Corridor Project crews will begin work on SR 99 including the installation of an underground water line and stormwater improvements. SR 99 will be fully closed to traffic beginning tomorrow, October 4, at 11:00 p.m. to Monday, October 7 at 5:00 a.m. During the closure:

  • SR 99 will be fully closed to traffic between Valley Street and the southern end of the Battery Street Tunnel. Traffic traveling through Seattle via SR 99 will be directed to I-5 in northern Seattle at 85th Street or in southern Seattle at E Marginal Way and Spokane Street. More information about alternate routes during construction may be found at: http://www.seattle.gov/transportation/mercercorridor.htm.
  • Mercer Street, Broad Street, and the I-5 on- and off-ramps at Mercer Street will remain open during the weekend work.
  • Pedestrian access will be maintained on the south side of Mercer Street between 5th Avenue N and Dexter Avenue N or via Broad Street.

Early warning signs will warn drivers prior to the SR 99 closure area. Travelers can expect significant traffic and delays, and should plan ahead to use alternate routes.

Please note: The Washington State Department of Transportation will be holding their semi-annual inspection of the Alaskan Way Viaduct on October 5th and 6th and associated closures of SR 99 between South Spokane Street and the Battery Street Tunnel will also be in effect. For more information about these closures, please visit the Washington State Department of Transportation’s Alaskan Way Viaduct Replacement Project website at: http://www.wsdot.wa.gov/Projects/Viaduct/Traffic.