Janes Creek (Alliance Road) Project

Fish Passage Project

Completed: October 2020

Overview

  • Retrofitted the existing concrete box culvert to improve Coho salmon passage conditions.
  • Enhanced habitat connectivity and integrity, thereby facilitating the return of anadromous fish migration to its historic conditions.

History/Location

Coho salmon (Oncorhynchus kisutch) historically spawned in the headwaters of Janes Creek. Previously conducted fish passage surveys of Janes Creek had identified this culvert as one of the highest priority restoration sites within the Janes Creek watershed. 

Restoration Enhancements

The project focused on retrofitting the existing concrete box culvert to improve passage conditions. Key objectives included increasing water depths and reducing water velocities during flows that allow for fish passage and reducing the water surface drop at the crossing outlet, without raising the base flood elevations. The restoration efforts aimed to promote habitat connectivity and integrity, thereby facilitating the return of anadromous fish migration to its historic conditions. By restoring habitat connectivity, Arcata is contributing to the re-establishment of historic Coho anadromy and the preservation of the corresponding genetic population. This project benefits all life stages of salmonids and lamprey (Entosphenus tridentatus) while preserving the flood conveyance capacity of the channel crossing.

Partnership and Funding

The U.S. Fish and Wildlife Service’s Coastal Program.

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