As a member of a design team, NW Fish Passage performed geomorphic assessments for four culverts, three in the Southwest Region and one in the Olympic Region. We prepared the Watershed and Site Assessment of the Preliminary Hydraulic Design Reports. We worked closely with the design team to ensure fish passage is achieved. NW Fish Passage provided 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 2024
Roles
- Hydrologic and Hydraulic Modeling
- Fish Passage Design
- Large Wood Inventory and Characterization
- Remote Sensing Analysis