The Seattle Department of Transportation will close the Battery Street Tunnel (SR 99) to both directions of traffic from 9 p.m. Saturday, Nov. 8 until 8 a.m. on Sunday, Nov. 9. During the closure, SDOT crews will test the fire suppression system.
Northbound traffic on the Alaskan Way Viaduct (SR 99) will be routed off the viaduct at Western Avenue, then directed to Broad Street, then to Second Avenue, and on to Battery Street to return to northbound Aurora Avenue North (SR 99).
Southbound traffic on Aurora Avenue North (SR 99) will be detoured from Aurora Avenue at Denny Way, then directed to Wall Street and then to Elliott Avenue to return to southbound Alaskan Way Viaduct (SR 99).
Residents nearby may notice a small amount of sediment in their water for the first few hours after testing.