Fish Passage Improved on the Quinsam River Fish passage improvements were recently completed at two bedrock cascades on the Quinsam River for the Campbell River Salmon Foundation. The cascades formed a partial barrier for adult Steelhead trout and Coho salmon migration to their upstream spawning sites. Northwest Hydraulic Consultants (NHC) designed the passage improvements, which were constructed during summer 2015. The improvements allow upstream migrating adult Steelhead trout and Coho salmon to navigate the falls under a variety of natural flow conditions.

The Quinsam River drains from Lower Quinsam Lake, southwest of the Campbell River on Vancouver Island, British Columbia. Bedrock at both cascades created shallow, fast flows with intermittent pools and drops. The cascades could only be passed by fish in some years at a narrow range of flows.

NHC designed the improvements by incorporating anchored logs and removing bedrock strategically to increase flow depths and provide resting areas and plunge pools for migrant fish. The project mostly used natural construction materials for durability and low maintenance. The contractor mobilized logs, equipment, and other materials to the site with hand crews and helicopters.

Click here for video of the completed project.


 Project site before and after photos