US 12 - Unnamed Tributary to Wynoochee River - Remove Fish Barrier

Project news

  • Beginning Monday, July 9, Lakeside Industries will begin efforts to remove and replace a culvert that runs under US 12 west of Devonshire Road near Montesano.
  • Construction will reduce US 12 to from four lane to two and lower the speed limit from 60 mph to 25 mph through fall.
  • This work is the final phase of a 7-mile paving project that has bee underway on US 12 since May.

Why is WSDOT replacing the culvert under US 12 near Montesano
The existing culvert that sends this stream under both directions of US 12 west of Montesano is a barrier to fish passage. The small culvert will be replaced with a larger box culvert to improve stream flows for migratory fish. 

This work is part of WSDOT's Fish Passage Barrier Removal Program, which identifies and removes barriers to fish passage caused by culverts under state highways.

In 2013, a federal court injunction required the state to significantly increase the state’s efforts in removing state-owned culverts that block habitat for salmon and steelhead.

The End Result
The fish passage project will help restore the stream bed to a more natural state and improve fish passage for local migratory fish.

Needs & benefits

  • This project will improve fish passage and open potential fish habitat for approximately two miles.
  • The work will help WSDOT comply with the U.S. District Court ruling regarding fish passage.


  • Winter 2017: Project advertised for competitive bidding.
  • Spring 2018: Contract was awarded to Lakeside Industries
  • Mid-Summer 2018: Estimated construction start.
  • Fall 2018: Most work is completed.


Financial Data for PIN 301268A
Funding Source Amount ($ in thousands)
2003 Gas Tax (Nickel Funding) $0
2005 Gas Tax (TPA) $0
Pre-Existing Funds (PEF) $4,830
CWA $0
Total $4,830


Tina Werner
WSDOT Communications

John Romero
WSDOT Project Engineer

US 12 - Unnamed Tributary to Wynoochee River - Remove Fish Barrier - Project vicinity map

View new traffic configuration through fall.

Existing US 12 culvert 
Existing culvert has been identified as a barrier to fish passage