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I-405 - Renton To Bellevue Project SR 169 to I-90

This project is in the design phase
This is a map of the Renton to Bellevue area along I-405.


July 2015

  • The Finding of No Significant Impact (FONSI) for the Renton to Bellevue Project was published on Nov. 20, 2008.
  • The Washington State Legislature recently funded a portion of the I-405 Renton to Bellevue project. WSDOT will add one lane in each direction on I-405 between SR 169 in Renton and NE 6th Street in Bellevue.  
  • An update of the Environmental Assessment began in fall 2014 using corridor project savings.

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.

Through this project, WSDOT plans to add one northbound and southbound lane on I-405 between SR 169 in Renton and NE 6th Street in downtown Bellevue. This new lane will be paired with the existing carpool lane to create a two-lane express toll lane system. The completed lanes will connect to the express toll lane system under construction between Bellevue and Lynnwood, as well as the SR 167 HOT lanes.

The Renton to Bellevue project was recently funded for construction in the 2015 transportation package.

The End Result
The Renton to Bellevue project will reduce congestion and improve safety along one of the state‚Äôs most congested sections of highway. This project will create a 40-mile system of express toll lanes that improves speeds and trip reliability for all travelers.

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 manage demand for limited road space by allowing non-carpools to pay a toll to use the HOV lanes for a faster, more reliable trip.
  • 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.

What is the project timeline?

  • July 2003:  Environmental documentation began.
  • July 2003:  Five percent footprint design began.
  • June 2005:  Environmental scoping report released.
  • March 9, 2006: Environmental Assessment published.
  • Next steps: Prepare project for construction, starting with an update of the Environmental Assessment.

Financial Information

The project team started updating the Environmental Assessment in October 2014 using $1.6 million in corridor savings. The estimated total cost to make this project "shovel ready" is $55 million. The construction phase is approximately $835 million.

How can I get more information?
Maggie Humphreys
I-405 Project Team Office
600 - 108th Avenue NE
Suite 405
Bellevue, WA 98004

Steve Peer
I-405 Project Team Office
600 108th Avenue NE
Suite 405
Bellevue, WA  98004

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