SR 9 - Unnamed Tributary to Pilchuck Creek - Fish Passage

Project news

  • Construction is scheduled for 2021.
  • Crews will fully close SR 9 between Skagit and Snohomish counties for a few days during this work. The detour is lengthy.
  • For updates on this and other Snohomish County highway news, sign up for weekly emails.

Needs & benefits

A culvert that runs under State Route 9 at milepost 34.7 south of Lake McMurray near the North Centennial Trail Trailhead is failing and needs to be replaced. The bottom of the culvert has rusted away, which means water is washing away the side of the road. This caused a sinkhole on the shoulder that was repaired in April 2018 and could cause further problems in the future. Contractor crews working for WSDOT need to close the highway for several days to dig up the old culvert and replace it during summer 2021.

People who use this section of the highway will need to plan for extensive detours in each direction during the closure. Crews will keep access to the North Centennial Trail Trailhead open from the north during this project.


Winter to fall 2019: Project design
Fall 2020: Advertise project for contractor bidding
Summer to fall 2021: Project construction


The current total engineer estimate is $1.8 million. Funding will come from the Connecting Washington funding package and other state and federal sources.


Tom Pearce

Mikkel Lamay
Project Engineer

A map showing the location on SR 9 of a culvert replacement project.