Southbound I-405 Weekend Closure: August 21-24

Published on August 17, 2026

Southbound-I-405-Closure-graphic-in-gray-with-I405-in-the-background.png

The Washington State Department of Transportation (WSDOT) will close southbound Interstate 405 from Coal Creek Parkway SE (Exit 10) to North 30th Street (Exit 6) from 11:30 p.m. Friday, August 21, to 4 a.m. Monday, August 24.

During the closure, crews will work on drainage, repaving and a traffic switch as part of the I-405/Renton to Bellevue Widening and Express Toll Lanes Project. Southbound detour signs will be in place.

Learn more from WSDOT and learn about additional closures in the region this weekend at wsdot.wa.gov/about/news.

 

2026-08-21 Southbound detour I405 August 21-24.png

Contact WSDOT

Phone

Craig Smiley, I-405/SR 167 Program Communications
425-417-9658

 

24-Hour Construction Hotline
425-818-0161

 

 

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