Southbound I-405 near Renton will be closed this weekend

By Drew Dotson • October 30, 2025 5:00 pm
The map shows the detour southbound 1-405 traffic will take this weekend through Renton. Photo provided by the city of Renton
The map shows the detour southbound 1-405 traffic will take this weekend through Renton. Photo provided by the city of Renton

A full closure of I-405 southbound near Renton is expected over the Halloween weekend.

Southbound I-405 in Renton will be closed from N. Southport Drive/Sunset Boulevard NE to State Route 167 from 11:59 p.m. Friday, Oct. 31, to 4 a.m. Monday, Nov. 3. A signed detour route will be in place.

Southbound I-405 drivers will take Exit 5 to Sunset Blvd. NE, Bronson Way N., Main Ave. S., and onto S. Grady Way.

The following ramps will be closed:

• SR 169/SR 900 on-ramp to southbound I-405

• Southbound I-405 off-ramp to SR 515/Talbot Road S. (Exit 3)

• Southbound I-405 off-ramp to southbound SR 167/Auburn/Rainier Avenue S. (Exit 2)

• Southbound I-405 direct connector ramp to SR 167

Crews will be excavating and installing drainage crossings, paving, and completing a traffic switch.

WSDOT notes that work is dependent on good weather and may be rescheduled. Schedule updates will be available on the project webpages, WSDOT’s Travel Center map, the WSDOT mobile app and by signing up for King County email updates.

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.