I-90 - Lewis and Sunset Creeks - Fish Passage

Project overview

As part of the state’s fish recovery efforts, the Washington State Department of Transportation has made it a priority to reconnect waterways where our roads act as barriers. In western Washington, that means building hundreds of fish passable structures under state highways in the next decade to create habitat gain essential for meeting our state fish recovery goals.

Starting in 2023, WSDOT will build nine such structures under Interstate 90 and local roads in Issaquah and Bellevue to restore natural stream conditions in Lewis and Sunset Creeks.

What to expect

We need to build bridge spans on Interstate 90 and parallel local roads to create the fish passages. This work will require several years of road and lane closures.


  • Lane reductions on eastbound I-90 for two years
  • Lane reductions on westbound I-90 for two years
  • On-ramp from Southeast Newport Way to eastbound I-90 closed with a detour to the SR 900 on-ramp for one weekend
  • Full closure on Southeast Newport Way for several months
  • Possible full closure on West Lake Sammamish Parkway Southeast for up to one month


  • Lane reductions on eastbound I-90 for two years
  • Lane reductions on westbound I-90 for two years
  • HOV direct access ramp closed from eastbound I-90 to 142nd Place Southeast
  • HOV direct access ramp closed from 142nd Place Southeast to westbound I-90
  • Single lane reductions on Southeast 36th Street and Southeast Eastgate Way
  • Mountains-to-Sound Greenway Trail shift or detour

Lane reduction and road closure designs are still being developed in coordination with Issaquah and Bellevue. Information will be updated as plans are finalized.


  • Spring 2021: Partnered with Muckleshoot Indian Tribe and Snoqualmie Indian Tribe on preliminary hydraulic design
  • 2021-2022: Preliminary project design
  • Spring 2022: Request for proposals
  • Fall 2022: Contractor selected and finishes design work
  • Winter 2023: Construction tentatively scheduled to begin
  • Winter 2028: Construction tentatively scheduled to finish


The project is estimated to cost $138 million with funding from the state’s Connecting Washington program.


Kris Olsen

Map showing five blocked culverts on Lewis Creek