Reminder: Follow-up viaduct inspection set for Saturday, March 22
The State Route 99 Alaskan Way Viaduct will be closed for additional inspection work Saturday, March 22.
Bridge inspectors will close all lanes of the viaduct between South Spokane Street and the Battery Street Tunnel from 4:30 a.m. to 7 p.m. Saturday. During the closure, crews will install monitoring devices on the viaduct to track the movement and growth of cracks over time. Engineers will use this data to help identify potential repairs.
Although vulnerable to earthquakes, the viaduct remains safe for everyday use. It will continue to provide a vital link to and through downtown Seattle until the SR 99 tunnel opens to traffic.
Be prepared for other closures this weekend
In addition to Saturday's viaduct inspection closure, the Seattle Department of Transportation (SDOT) will have a nighttime closure on southbound SR 99 as well as daytime closures of the Mercer Street ramps to I-5 as part of the Mercer Corridor Project. SDOT crews will close all southbound lanes of SR 99 between Valley and Thomas Streets for girder settings from 11 p.m. Friday to 10 a.m. Saturday.
The closures are part of a busy weekend of road work. Be sure to plan ahead and check traffic conditions before you head out.