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More I-405 closures May 11-18
Crews will close northbound lanes and post detours as part of a widening project expected to finish in 2027.
Northbound I-405 from North Southport Drive to Coal Creek Parkway Southeast will close from 11:30 p.m. Friday, May 15, to 4 a.m. Monday, May 18, for construction work.
The Bellevue Widening and Express Toll Lanes Project requires these closures to expand highway capacity, with an expected completion date of 2027.
Several partial closures affect I-405 throughout the week, including up to four lanes on southbound segments and multiple nightly restrictions, to accommodate ongoing construction activity.
Signed detours will guide drivers around restricted zones during weekend and overnight work periods; crews typically begin closures as early as 11:30 p.m. each night.
Future improvements include a 40-mile ETL system connecting Bellevue and Lynnwood, supporting the new I-405 Bus Rapid Transit line to Tukwila to increase trip reliability.