- Federal Highway Administration, Fish Passage for Bridge and Culverts, Hydraulic Engineering Circular-26
- California Department of Fish and Game
- NOAA National Marine Fisheries
- Oregon Department of Fish and Wildlife, 2004. Fish Passage Criteria, October 22, 2004
- Oregon Department of Fish and Wildlife
- U.S.D.A Forestry Service
- U.S. Fish and Wildlife Service
- Washington Department of Fish and Wildlife
