Project Info

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I-405 Renton to Bellevue Widening and Express Toll Lanes project


January 2018

  • This project is currently in the environmental review and preliminary engineering phase, with construction scheduled to begin in 2019.

Why is WSDOT improving I-405 from Renton to Bellevue?
Travelers on the stretch of I-405 between SR 167 in Renton and Northeast 6th Street in downtown Bellevue face one the most gridlocked routes in the state, particularly during peak travel times. The Renton to Bellevue Widening and Express Toll Lanes project will improve traffic flow and safety by continuing to build improvements from the I-405 Master Plan.

The Renton to Bellevue project was funded in the 2015 Connecting Washington transportation package. The project will add new capacity to create a two-lane express toll lane system between SR 167 in Renton and Northeast 6th Street in Bellevue.

The completed lanes will connect to the express toll lane system between Bellevue and Lynnwood, as well as the SR 167 HOT lanes.

The End Result
The Renton to Bellevue project will reduce congestion and improve safety along one of the state’s most congested sections of highway. 

This project will connect a 40-mile system of express toll lanes that improves speeds and trip reliability for all travelers and supports the new I-405 Bus Rapid Transit line included in the Sound Transit 3 package.

Other project highlights include:

  • Improvements at four interchanges: Northeast Park Drive and Northeast 44th Street in Renton, and 112th Avenue Southeast and Coal Creek Parkway in Bellevue
  • Construction of portions of the Eastside Rail Corridor regional trail, including a new crossing over I-405 at the site of the former Wilburton rail bridge (in partnership with King County) 
  • New direct access ramp at NE 44th Street in Renton (in partnership with Sound Transit) to help support Bus Rapid Transit operations


Project Benefits

  • Congestion relief. The addition of the northbound and southbound lanes between SR 169 in Renton and NE 6th Street in Bellevue reduces congestion by increasing capacity. Express toll lanes help keep traffic moving by providing a choice for a faster, more reliable trip when drivers need it most.
  • Safety. The additional capacity reduces the likelihood of sideswipe and congestion-related collisions.
  • Environment. WSDOT's I-405 Corridor Program team is designing the Renton to Bellevue widening and express toll lanes project to avoid and minimize impacts to the environment. Environmental improvements through this project will include new noise walls, stormwater enhancements, and improvement of fish passage in streams.


What is the project timeline?

  • Summer 2015: Funded by Connecting Washington for preliminary engineering, right of way acquisition, and construction
  • 2019: Start of construction
  • 2024: Open to traffic


Financial Information
The Legislature through Connecting Washington funded $1.22 billion in improvements for the south end of I-405, including the I-405/SR 167 Interchange Direct Connector project and the I-405 Renton to Bellevue Widening and Express Toll Lanes project.


How can I get more information?

Anne Broache

I-405/SR 167 Corridor Communications

The Washington State Department of Transportation is a public agency and is subject to the State of Washington’s Public Records Act (RCW 42.56). Therefore, public comments and questions may be made available to anyone requesting them for non-commercial purposes.

This is a map of the Renton to Bellevue area along I-405