Construction notifications

Construction closures and nighttime noise work

Cones blocking the ramp entrance to Alaskan Way Viaduct
This page contains SR 99 and Seattle street closures due to work on the Alaskan Way Viaduct Replacement Program. See bottom of page for other traffic resources from around the region.


Last updated: June 26, 2018

There are no full closures of SR 99 planned at this time


Last updated: July 12, 2018

North of Denny Way

  • Street restoration work has begun on the closed block of Sixth Avenue North between Harrison and Thomas streets. This new phase of work is part of the SR 99 Connections Project. The street remains closed.

View notice

  • Seattle Tunnel Partners has completed street restoration work at the north portal.

View notice

Downtown waterfront

South of Yesler Way

  • Long-term closure: The east lane of East Frontage Road, and the adjacent sidewalk, is closed for construction, between South Atlantic Street and Royal Brougham Way.
  • Long-term closure: The south side of South Royal Brougham Way, between First Avenue South and East Frontage Road South, is closed for construction. The south sidewalk, and the parking lot driveways to the western Pyramid Brewing parking lot, are also closed.

View detour


Last updated: July 12, 2018

SR 99 Connections project

  • July 16: Crews will conduct sewer connection work in the existing work zone on Royal Brougham Way, west of First Avenue South. This work will involve excavation, lights and other machinery.
  • July 17: Crews will conduct sewer connection work on Railroad Way South, just south of the intersection with South King Street. Railroad Way South will be closed from 9 p.m. Tuesday until 5 a.m. Wednesday. This work will involve excavation, vactor trucks and lights. Building and garage access will be maintained and detour signs will be posted.
  • July 18-19: Crews will close the northbound left lane of SR 99 mainline for two nights of barrier work on SR 99. The work will occur near South Atlantic Street and a quarter mile south of that point. The work will involve lights and machinery.
  • Starting July 23: Railroad Way South will be closed weekday nights from 9 p.m. to 5 a.m. so crews can conduct drainage work. The work will take approximately two weeks, and involve excavation and soil compaction. Detour signs will be posted and building and garage access will be maintained.