SR 20/Olson Creek and Unnamed Tributary to Skagit River - Fish Passage - Completed Spring 2025

Project overview

Contractor crews working on behalf of WSDOT replaced the culvert crossings under State Route 20 at an unnamed tributary to Skagit River (milepost 94) and Olson Creek (milepost 105) in Marblemount. The old culverts were barriers to fish passage and were replaced with structures that will allow spawning fish to pass beneath SR 20.

What to expect

Finishing touches to the project was completed in April 2025. Travelers should not expect to see any construction-related delays in the project area.