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, August 1 - Friday, August 8

    SR 99 corridor

    Advance notice for Friday, Aug. 22 – Wednesday, Aug. 27

    • Crews will close both directions of SR 99 between South Spokane Street and Valley Street from 10 p.m. Friday, Aug. 22 to 5 a.m. Monday, Aug. 25. Northbound SR 99 will be open from South Royal Brougham Way until midnight Friday for exiting Seahawks game traffic.
    • Both directions of SR 99 will remain closed between the south end of the Battery Street Tunnel and Valley Street from 5 a.m. Monday to 5 a.m. Wednesday.   

    Regional closures

    Friday, Aug. 1 - Sunday, Aug. 3

    • The Seafair Air Show will close I-90 between Rainier Avenue South and West Mercer Way from 1:15 p.m. to 2:40 p.m. each day.

    North

    Monday, Aug. 4 – Thursday, Aug. 7

    • Mercer Corridor Project crews will close one lane in each direction of Mercer Street between Sixth Avenue North and SR 99 from 7 p.m. to 5 a.m. each night.

    Monday, Aug. 4 – Friday, Aug. 8

    • Mercer Corridor Project crews will close the eastbound right lane of Mercer Street between Fourth Avenue North and SR 99 from 9 a.m. to 3 p.m. each day.
    • Crews will close Dexter Avenue North between Mercer and Thomas streets from 7 p.m. to 5 a.m. each night.

    Friday, Aug. 8

    • The South Lake Union Block Party will close John Street between Ninth Avenue North and Westlake Avenue North from noon to 11 p.m. 
    — more —

Current Conditions




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