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Highlights for Friday, Sept. 27 – Monday, Oct. 8

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:
Sunday, Sept. 30

• 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 from 9 p.m. Sunday through 5 a.m. Monday.

Saturday, Oct. 6, through Monday, Oct. 8

• Semiannual viaduct inspection and maintenance work will close both directions of the Alaskan Way Viaduct from just north of the Battery Street Tunnel to the West Seattle Bridge around-the-clock from 6 a.m. Saturday through 4 p.m. Sunday.

• SR 99 Aurora Bridge seismic retrofit work will reduce traffic across the bridge to one lane in each direction from 9 p.m. Friday through 2 p.m. Sunday. Beginning at 2 p.m. Sunday, crews will open more lanes to accommodate traffic heading to and from the Sounders match at CenturyLink Field.

North:

Monday, Oct. 1 through Friday, Oct. 5

• John Street will be closed between Sixth Avenue North and Taylor Avenue North from 7 a.m. to 5 p.m. daily.  Additionally, flaggers will alternate traffic in the intersection of Sixth Avenue North and John Street.

Central:

Monday, Oct. 1, through Friday, Oct. 5

• The southbound parking lane on Western Avenue between Marion and Columbia streets will be closed from 7 a.m. to 5 p.m. daily.
• The shared-use path under the viaduct will be reduced to 4-feet wide at Columbia Street from 7 a.m. to 7 p.m. daily.

Monday, Oct. 1, and Tuesday, Oct. 2

• Crews will remove parking and/or close lanes on Columbia Street between Alaskan Way and Western avenues from 7 a.m. to 5 p.m.
• Crews will close the south parking lane on Yesler Way between Alaskan Way and Western Avenue from 7 a.m. to 10 a.m.

Monday, Oct. 1, through Wednesday, Oct. 3

• The left lane on Marion Street between Western and Post avenues will close from 7 p.m. to 5 a.m. nightly.

Thursday, Oct. 4

• Crews will close the right lane on Marion Street from Alaskan Way to Western Avenue from 7 a.m. to 5 p.m.

Thursday, Oct. 4, and Friday, Oct. 5

• Crews will close the left lane on Madison Street from First Avenue to Western Avenue from 7 a.m. to 5 p.m.

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

Milepost 31 Speaker Series – Protecting structures along the SR 99 tunnel route

Safety is WSDOT’s number one priority on the SR 99 Tunnel Project. This includes protecting buildings, utilities and roadways above and near the tunnel route. Learn how advanced technology will allow WSDOT to keep a continuous eye on the ground around the tunnel before, during and after construction.

6 to 6:30 p.m.
Thursday, Oct. 4

Milepost 31

211 First Ave. S., Seattle

Admission is free.

After the talk, be sure to leave enough time to explore the rest of the First Thursday Art Walk in Pioneer Square. Milepost 31 is open Tuesdays through Saturdays from 11 a.m. to 5 p.m., and stays open until 8 p.m. on First Thursdays.

Tunneling toward a new SR 99 corridor

At 57.5 feet in diameter – roughly as tall as a five-story building – the SR 99 tunnel boring machine will be the world’s largest. Crews are currently assembling the machine in Japan. It will be tested, taken apart and barged to Seattle in more than 40 pieces, which will be reassembled in an 80-foot-deep launch pit to the west of Seattle’s stadiums. The first pieces of the machine will begin arriving early next year, and tunneling is scheduled to start next summer.

Curious how the tunnel boring machine will work? Check out the 10-foot-long, motorized scale model on display at Milepost 31 for an up-close look at the machine’s inner workings.