Prototype Lamprey-Passage Structure
During a mid-point inspection Jan. 15 at a fabrication facility in Longview, Wash., Corps engineers checked out an arrangement of baffles welded into the floor of a one-foot-high box-like section. The circle and half-circle baffles create a variety of flow velocities for lampreys entering the fish ladder. Future studies will help researchers determine which velocities are most preferred by migrating lampreys.

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Tags: lamprey, McNary
Photo by: U.S. Army Corps of Engineers - Josh Davin  |  VIRIN: 140115-A-CE999-583.JPG