Be prepared: Road closures at South Dearborn Street and Denny Way, and an overnight tunnel closure all happening this week

Posted on Sep 10 2019 11:34 AM

9/13 update: The southbound detour on Seventh Avenue North has been changed and the map below updated.

Multiple road closures are coming at the end of this week – here’s a look at what to expect to help you plan your travels.

Demolition at South Dearborn Street begins this Thursday, Sept. 12

This Thursday morning South Dearborn Street will close as crews begin demolishing the portion of the viaduct that remains overhead. Northbound King County Metro buses that currently turn onto South Dearborn Street from SR 99 will temporarily reroute. South Dearborn street will reopen by Sept. 22.

Aerial of Dearborn Street showing section of viaduct to be demolished and road to be closed

Caption: The two remaining sections of viaduct (in orange) at South Dearborn Street may not look big, but removing them is complex work due to the many underground utilities that criss-cross the area.

SR 99 tunnel overnight closure this Friday, Sept. 13

Both directions of the SR 99 tunnel will be closed 10 p.m. Friday, Sept. 13 to 8 a.m. Saturday, Sept. 14 for regular maintenance. The tunnel’s northbound direction will close again at 10 p.m. Saturday night and reopen by 8 a.m. Sunday, Sept. 15.

Denny Way closed this weekend with detours of Seventh Avenue North

If weather allows crews will pour new concrete in the intersection of Denny Way and Seventh Avenue North this weekend. The work will close Denny Way between Sixth Avenue and Borealis Avenue from 7 p.m. Friday, Sept. 13 until 5 a.m. Monday, Sept. 16. As a result, Wall Street at Denny Way will also be closed, and Southbound Seventh Avenue North will be detoured at Thomas Street.

Map showing intersection of Seventh Avenue North and Denny Way closed, with pedestrian detour route via Sixth Avenue and Borealis Avenue

This is part of a series of weekend closures at Denny Way and Seventh Avenue that started in late August and continues into the fall. Please note that this work is weather-dependent and may be subject to change.

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