Visit WSDOT’s website for a complete list of closures. Closure information changes frequently, so remember to check for updates throughout the week.
Corridor-wide:
- Viaduct reinforcement work will close all lanes of southbound SR 99 between the north end of the Battery Street Tunnel and the West Seattle Bridge at the following times:
- 9 p.m. to 5 a.m. nightly. Sunday, Sept. 16 – the morning of Friday, Sept. 21.
- 9 p.m. to 5 a.m. nightly. Sunday, Sept. 24 – the morning of Friday, Sept. 28.
North:
Monday, Sept. 17 through Wednesday, Sept. 19
- Parking will close and flaggers will alternate one-way traffic on Thomas Street between Sixth Avenue North and Taylor Avenue North from 7 a.m. to 5 p.m. daily.
Monday, Sept. 17 through Thursday, Sept. 20
- Parking will be closed around-the-clock on Harrison Street between Broad Street and Sixth Avenue North and flaggers will direct traffic from 7 a.m. to 5 p.m. daily.
Monday, Sept. 17, through Friday, Sept. 21
- John Street will close from 7 a.m. to 5 p.m. daily between Sixth Avenue North and Taylor Avenue North, and from Aurora Avenue North to the alley.
- Parking will close and flaggers will alternate traffic on Sixth Avenue North between Thomas and John streets from 7 a.m. to 5 p.m. daily.
Central:
Monday, Sept. 17
- The north parking lane and north lane on Marion Street will close between Alaskan Way and First Avenue from 7 p.m. to 5 a.m.
Monday, Sept. 17, through Friday, Sept. 21
- The southbound parking lane on Western Avenue between Marion and Columbia streets will be closed from 9 a.m. to 3 p.m. daily.
Tuesday, Sept. 18, through Friday, Sept. 21
- The right travel lane and the parking lane on Marion Street between Alaskan Way and First Avenue will be closed from 7 p.m. to 5 a.m. nightly.
South:
Friday, Sept. 14, through Monday, Sept. 17
- All lanes of northbound SR 99 will be closed between South Royal Brougham Way and the West Seattle Bridge from 10 p.m. Friday until 5 a.m. Monday. The on-ramps to and from South Royal Brougham Way will remain open to serve event traffic.
- The left lane of southbound SR 99 will be closed between South Royal Brougham Way and the West Seattle Bridge from 11 p.m. Friday through 11 a.m. Saturday morning.
- The following streets will be closed from 7 p.m. Saturday to 5 a.m. Sunday morning:
- South Atlantic Street west of Colorado Avenue South.
- East Marginal Way South between South Hanford Street and South Atlantic Street.
Quick links:
- Current work: The most up-to-date resource for construction related to the Alaskan Way Viaduct replacement.
- Traffic: Real-time conditions on Seattle area highways and many connecting streets.
- Transit: WSDOT funded additional bus service along routes affected by construction.
- Bike/walk: We maintain a safe and reliable path for bicyclists and pedestrians through the construction area.
Website links
Alaskan Way Viaduct Replacement Program
SR 99 Tunnel Project | South Holgate Street to South King Street Project