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

Project news

  • 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, reliability and safety performance by continuing to build improvements from the I-405 Master Plan.

The Renton to Bellevue project was funded by 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.

In general, the project will add one new lane in each direction. The existing HOV lane will be combined with this new lane to create a dual express toll lane system. 

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

The new express toll lanes 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 system of express toll lanes. This project is designed to improve speeds and trip reliability for all travelers and support the new I-405 Bus Rapid Transit line between Lynnwood and Tukwila included in the voter-approved Sound Transit 3 package.


Project highlights

  • Dual express toll lane system from SR 167 in Renton to Northeast Sixth Street in Bellevue
  • New southbound auxiliary lanes in the I-90 to 112th Avenue Southeast vicinity
  • 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 2.5-mile paved section and a new crossing over I-405 in downtown Bellevue at the site of the former Wilburton rail bridge (in partnership with King County) 
  • New direct access ramp and inline transit station at NE 44th Street in Renton to help support Bus Rapid Transit operations (in partnership with Sound Transit) 


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 performance. 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 three new noise walls, stormwater enhancements, and improvement of fish passage in streams.


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


Longer term plans for the south end of I-405

The I-405 Master Plan includes one additional general purpose lane in each direction in this section of the roadway and other associated improvements to interchanges, local roadways, noise walls and stormwater management facilities. This longer-term work is not currently funded for design or construction. 


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