Prototype Lamprey-Passage Structure
NOAA Fisheries Biologist Trevor Conder and Bart Bartelme, fabrication sub-contractor at Waite Specialty Machine in Longview, Wash., ensure the exclusion bars welded in front of each entrance orifice of the prototype lamprey-passage structure meets minimum-clearance specifications to allow lampreys through, but prevent salmon and steelhead from attempting to enter and possibly getting stuck.

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Tags: lamprey, McNary
Photo by: U.S. Army Corps of Engineers - Steve Juhnke  |  VIRIN: 140115-A-CE999-106.JPG