Southbound I-405 to close this week for construction

By Drew Dotson drew.dotson@rentonreporter.com • August 4, 2025 5:22 pm
The I-405/Renton to Bellevue Widening and Express Toll Lanes Project will cause a closure of Southbound lanes this week. Photo provided by the Washington Department of Transportation
The I-405/Renton to Bellevue Widening and Express Toll Lanes Project will cause a closure of Southbound lanes this week. Photo provided by the Washington Department of Transportation

There will be a full closure of southbound I-405 this week.

All southbound lanes of I-405 between the North Southport Drive off-ramp and the Sunset Boulevard N. / SR 169 on-ramp will be fully closed from 11:30 p.m. Aug. 4 to 4 a.m. Aug. 8.

Signed detours will be in place to divert traffic.

The closure is due to the I-405/Renton to Bellevue Widening and Express Toll Lanes project, which will add new capacity between SR 167 in Renton and Northeast Sixth Street in Bellevue. One new lane will be added in each direction and combine the existing HOV lane with the new lane to create a dual ETL system.

The new ETLs will connect to the existing express toll lane system between Bellevue and Lynnwood, as well as the SR 167 HOT lanes via the I-405/SR 167 Interchange Direct Connector, to create a 40-mile ETL system.