Construction notifications

Construction notices and detours

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: Sept. 18, 2018

Northbound SR 99 closed: Closure begins 9 p.m. Friday, 9/21 from South Spokane Street to the south end of the Battery Street Tunnel. Saturday evening (9/22) the northbound SR 99 on-ramp at South Royal Brougham Way will reopen. Northbound SR 99 from South Spokane Street to South Royal Brougham Way will reopen Monday 9/24 at 5 a.m.


Last updated: Sept. 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.

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Downtown waterfront

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South of Yesler Way

  • Railroad Way South: Southbound Railroad Way South will be closed at night, 9/12 - 9/14, for drainage work.

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  • First Avenue South: Detours will be in place for evening and night work on First Avenue South near its intersection with Railroad Way South. Detours begin Monday, Sept. 17.

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  • 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 driveway to the parking lot west of Pyramid Brewing, are also closed.
  • Partner agency project: SDOT - Center City Connector streetcar
  • Partner agency project: Seattle City Light - Central waterfront transmission line relocation project


Last updated: Sept. 18, 2018

SR 99 Connections project

  • Sept 17-27: Excavation and electrical work near intersection of First Avenue South and Railroad Way South. Will involve impact work 5 - 10 p.m. and additional night work.

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