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https://www.noaa.gov/media/digital-library-photo/pl23fizh1808jpgDescription
This truss contains three fingerling traps. The entire unit can be submerged to catch fish immediately after they have passed through the turbine and drafttube. (Image credit: NOAA Central Library Historical Fisheries Collection)
Credit
NOAA Central Library Historical Fisheries Collection
Location
Oregon, Columbia River, Bonneville Dam
Collection
Historic Fisheries