• Project

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

There will be night work in Renton and Bellevue as part of this project during the weeks of May 23 to May 29 and May 30 to June 5. For specific details about the work, you can view the what to expect section below. 

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

During construction, traffic conditions are expected to remain similar to existing conditions during the most congested times of the day, although some short-term delays may occur. Temporary closures would be required to widen the freeway, but they would occur on nights and weekends when traffic demand is lower and detour routes can better accommodate additional vehicles. Increases in vehicle delay would occur through construction areas and along detour routes. Construction is not expected to affect tolling operations. We will work to minimize inconveniences to motorists during highway construction with up-to-date information about traffic and travel options.

Week of May 23 to May 29

City of Renton

  • No scheduled work

City of Bellevue

  • Flatwork installation (1 night), sidewalk installation (2 nights), temporary barrier installation (1 night), barrier demolition (2 nights), drainage installation (4 nights), light installation (2 nights) and temporary ITS work (5 nights) near Main Street Bridge in Bellevue

Week of May 30 to June 5

City of Renton

  • Coring hot mix asphalt shoulders along the highway corridor (3 nights)

City of Bellevue

  • Drainage installation (5 nights) and conduit installation (4 nights) near Main Street Bridge in Bellevue
  • Geotechnical borings (4 nights) and coring HMA shoulders (3 nights) along the highway corridor
  • Attenuator repair near Southeast Eighth Street and I-90 in Bellevue (1 night)

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