RENTON, Wash. — Interstate 405 will fully close in Renton this weekend so crews can continue to work on widening the roadway in Renton and adding express toll lanes.
The closures will begin at 11 p.m. Friday and run until 4 a.m. on Monday, July 15, says the Washington State Department of Transportation (WSDOT). During that time, northbound I-405 will close from the North Southport Drive on-ramp to the off-ramp to 112th Avenue Southeast. Southbound I-405 will close from Coal Creek Parkway Southeast on-ramp to the off-ramp to Northeast 30th Street. There will be signed detour rates for people to navigate around the closures in both directions.
WSDOT crews will be demolishing the existing 112th Avenue Southeast bridge at Exit 9 and installing drainage crossings under both the north and southbound lanes of I-405.
That won't be the only eastside highway closure this weekend, as Interstate 90 will close all eastbound lanes from Seattle to Mercer Island at 10 p.m. Friday until 6 a.m. Saturday morning. The southbound Interstate 5 off-ramp to eastbound I-90 and southbound Rainier Avenue South on-ramps to eastbound I-90 will close at 9 p.m. Friday as well. WSDOT says all lanes will be reopened by 6 a.m. on Saturday, July 13. The closures are for tunnel maintenance, per WSDOT.
The I-405 Renton to Bellevue Widening and Express Toll Lanes project aims to address what WSDOT calls "one of the state's worst commutes." It will create a two-lane express toll lane between State Route 167 in Renton and Northeast Sixth Street in Bellevue, WSDOT says.
The project is expected to be completed in 2025.