SR 203 - Loutsis Creek - Fish Passage

Project news

  • SR 203 reopened at 9:30 p.m. Sunday, Aug. 30.
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Needs & benefits

Loutsis Creek goes through a 5-foot culvert under SR 203 just south of Duvall. The culvert is difficult for fish to navigate at times because water levels can be too low or can move too fast. To improve passage for native and migratory fish, we replaced the culvert with an arched structure and build a more natural creek bed under the highway. This will improve fish runs and open an additional 3.1 miles of habitat for fish and other aquatic creatures.

This work required this section of SR 203 to close for about five weeks starting in July 2020. The approximately 13,000 vehicles a day that use this portion of the highway detoured via Northeast 124th Street, West Snoqualmie Valley Road Northeast and Northeast Woodinville-Duvall Road.


  • April 2020: Complete design and advertise project for competitive bidding.
  • May 2020: Contract awarded to Goodfellow Bros.
  • July 2020: Construction begins.
  • July 26, 2020: SR 203 closed at Loutsis Creek.
  • Aug. 30, 2020: SR 203 reopened at Loutsis Creek.
  • Fall 2020: Construction is scheduled to be complete.


The total estimated project cost is $8.2 million, using state and federal funding.


Tom Pearce
WSDOT Communications

A small map showing the location of Loutsis Creek near Duvall.