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Southwest and Olympic Region Fish Passage Culvert Projects

As a member of a design team, Fain Environmental is performing geomorphic assessments for four culverts, three in the Southwest Region and one in the Olympic Region. We are preparing the Watershed and Site Assessment of the Preliminary Hydraulic Design Reports. We are working closely with the design team to ensure fish passage is achieved. Fain Environmental is providing information on grain size, determining the representative reference reach, and calculating the vertical and horizontal channel profile.

Location: Lewis, Pacific, and Grays Harbor  County, Washington

WRIA 22, 23: Lower Chehalis, Upper Chehalis

Owner: Washington Department of Transportation

Year: 2021 to present


  • Hydrologic and Hydraulic Modeling
  • Fish Passage Design
  • Large Wood Inventory and Characterization
  • Remote Sensing Analysis