• 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

Maintenance work along I-405 in Bellevue

Starting Monday night, Sept. 12, crews will be installing dowel bars to repair and reinforce concrete panels on southbound and northbound I-405 between I-90 and Coal Creek Parkway Southeast. The work will take approximately three months to complete, with crews working at any one location for up to one week.

Crews will be working overnight Monday through Friday from 9 p.m. to 5 a.m. This work must occur at night when highway lanes can be closed safely. Saturday work may be required due to potential weather conditions.

Crews will be using grinder and concrete saws to cut concrete panels and install dowel bars, as well as light towers to illuminate work areas and other equipment. This work may produce noise audible above the background noise of the highway.

Crews will use strategies to minimize noise, including avoiding banging truck tailgates, using trucks with well-maintained bed liners for hauling, and using ambient sensitive backup warning devices.

Main Street Bridge Closure

Main Street across I-405 in Bellevue will be closed for potentially up to five months while crews replace the Main Street Bridge. For more information about this closure, including detour routes, please read our blog.

Learn more about the Main Street Bridge closure

Obtenga más información sobre el cierre del puente de Main Street

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了解有关 Main Street Bridge 关闭的更多信息

了解有關 Main Street Bridge 關閉的更多信息

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Upcoming night work

Week of Nov. 20 to Nov. 26

City of Bellevue

  • Diamond grinding, chip out and pour back the roadway, and seal cracks between Main Street and I-90 (4 nights)

City of Renton

  • Remove existing light pole near May Creek (1 night)


Week of Nov. 27 to Dec. 3

City of Bellevue

  • Roadway maintenance near Main Street bridge (4 nights)
  • Diamond grinding, chip out and pour back the roadway between Main Street and I-90 (4 nights)

City of Renton

  • Install temporary barrier near May Creek bridge (1 night)

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