• Project

I-405/Renton to Bellevue Widening and Express Toll Lanes Project

Project overview

Travelers on Interstate 405 between Renton and Bellevue experience one of the state’s worst commutes. The I-405 Renton to Bellevue Widening and Express Toll Lanes project includes multimodal transportation and safety improvements to offer more reliable travel choices and keep drivers, transit riders and freight moving.

The Renton to Bellevue project will add new capacity to create a two-lane ETL system between SR 167 in Renton and Northeast Sixth Street in Bellevue. In general, the project will add one new lane 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. This project is designed to improve speeds and trip reliability for all travelers and support the new I-405 Bus Rapid Transit (BRT) line between Lynnwood and Tukwila included in the voter-approved Sound Transit 3 package.

Summer 2015 - Fall 2024
Project status
$705 million (contractor’s bid amount)
Project hotline

What to expect

Main Street bridge construction

The Main Street bridge across I-405 in downtown Bellevue was fully reopened vehicular traffic on Sunday, Jan. 29. Crews demolished the old Main Street Bridge in June 2022 and have been replacing the bridge to accommodate the future new lanes on I-405. For more information about this work, please read our blog.


Upcoming night work

Week of Jan. 29 to Feb. 4

City of Renton  

  • Demolition and removal of median barrier then paving and install of temporary barrier near May Creek (4 nights)
  • Install crane mats for watermain protection near the May Creek bridge and equipment mobilization into area (5 nights)

City of Newcastle  

  • Soil haul-out near 109th Place Southeast (2 nights)

City of Bellevue  

  • Demobilize from Main Street bridge area (5 nights)


Week of Feb. 5 to Feb. 11 

City of Newcastle 

  • Install two drainage structures near Lake Washington Boulevard (2 nights)
  • Soil haul-out near 109th Place Southeast (2 nights)

Project improvements will occur in the Renton to Bellevue area along I-405.