SR 169 - Ravensdale Creek - Fish Passage

Project news

  • This project is scheduled to advertise for competitive bid in spring 2021. Construction is scheduled to begin in summer 2021.
  • Sign up to receive email updates about this project and other south King County area topics.

Needs & benefits

Ravensdale Creek goes under SR 169 through an 82-foot long, 6-foot by 5-foot culvert. During spawning season, water travels through the culvert too fast for salmon and other fish to continue upstream. In 2021 and 2022, we will replace this culvert with a bridge that will open the creek and surrounding wetlands. We will also remove a culvert about 200 feet downstream, leaving an open channel, and correct the hiking trail fish barrier about 350 feet downstream. This work will open an additional 2.4 miles of spawning and rearing habitat for Chinook, coho, steelhead and other species.

What travelers should expect
To keep people moving along the SR 169 corridor during construction, we will build a single-lane bypass on a section of old highway right-of-way just west of the current SR 169 roadway. We also will keep one lane of the existing two-lane highway open; this will allow us to maintain traffic in both directions with the least disruption.

This work likely will require one weekend-long closure of SR 169 to remove the old culvert under the highway and build the bypass over Ravensdale Creek.

What trail users can expect
During this project, trail users will hear construction noises and encounter temporary and permanent trail closures for public safety.

  • Temporary trail closures will total about a quarter-mile, or 1.5 percent of the trail system.
  • Permanent closures total about 1/10th of a mile, or 0.5 percent of system.
  • Trails will reopen as soon as it is safe to do so.

Timeline

  • Spring 2021: Project advertised for competitive bid
  • Spring 2021: Contractor selected for project.
  • Summer 2021: Construction begins
  • Fall 2022: Construction complete

Funding

The total project cost is estimated to be $7.9 million.

Contact

Tom Pearce
WSDOT Communications
206-440-4696
tom.pearce@wsdot.wa.gov

A small map showing the location of the SR 169 Ravensdale Creek project
We will replace culverts at SR 169 and Ravensdale Creek.