Traffic Highlights

Traffic Highlights

Welcome to your headquarters for viaduct-related traffic information. Major traffic changes are highlighted on this page. To your right are links to a full list of closures, traffic cameras, and other resources to help you find your way. You can also sign up to receive weekly emails about upcoming detours and closures.


  • Construction highlights for Friday, Sept. 26 - Friday, Oct. 3

    SR 99 corridor

    Saturday, Sept. 27 to th‚Äče morning of Sunday, Sept. 28

    • Crews will close up to two lanes on northbound SR 99 between South Spokane Street and South Atlantic Street from 11:59 p.m. Saturday to 8 a.m. Sunday.

    • Crews will close up to two lanes on southbound SR 99 between South Spokane Street and South Atlantic Street from 11:59 p.m. Saturday to 8 a.m. Sunday.

    Sunday, Sept. 28; Tuesday, Sept. 30; Thursday, Oct. 2

    • Crews will close all lanes of northbound SR 99 between South Spokane Street and South Royal Brougham Way from 10 p.m. to 5 a.m. each night. The ramp from the West Seattle Bridge to northbound SR 99 will also be closed each night. These closures are weather dependent

    Monday, Sept 29; Wednesday, Oct. 1

    • Crews will close all lanes of southbound SR 99 between South Atlantic Street and South Spokane Street from 10 p.m. to 5 a.m. each night. The Columbia Street on-ramp to southbound SR 99 also will be closed each night. These closures are weather dependent

    North

    Friday, Sept. 26 – Friday, Oct. 3

    • Mercer Corridor Project crews will close one lane in each direction of Fifth Avenue between  Mercer and Republican streets from 9 a.m. to 3 p.m. each day 

    • Mercer Corridor Project crews will close one lane in each direction of Mercer Street between Fifth Avenue North and Ninth Avenue North from 9 a.m. to 2 p.m. each day  

    — more —

Current Conditions




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