Project: Evaluation of Adult Fish Ladder Modifications to Improve Pacific Lamprey Passage at McNary Dam
Client: USACE – Walla Walla District
Location: McNary Dam
Studies have indicated that fish passage structures (e.g., adult fish ladders) at Federal Columbia River Power System dams may impede upstream migration of adult Pacific lamprey. Recent modifications aimed at improving passage conditions for lamprey at dams have been implemented, including a Lamprey Prototype Entrance Structure (LPES) at the McNary Dam South Fishway Entrance Slot 2. As part of this study we evaluated lamprey approach and passage behavior at the LPES and monitored adult salmonid interactions at the entrance of the structure using optical and acoustic (i.e., Dual Frequency Identification Sonar) imaging techniques.
Project was conducted with University of California – Davis, University of Idaho, and Blue Leaf Environmental and required close coordination and collaboration with the Corps, as well as multiple Federal, State, and Tribal stakeholders.