Prototype Lamprey-Passage Structure
U.S. Army Corps of Engineers structural and design engineers developed a prototype lamprey-passage structure that fits into the entrance of McNary Dam’s Oregon shore fish ladder. The structure was installed Feb. 11-25 to provide a less-stressful passage route for migrating lampreys.

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Tags: lamprey, McNary
Photo by: U.S. Army Corps of Engineers - CADD illustration by Josh Davin  |  VIRIN: 140226-A-CE999-001.JPG