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![The dredge head of the Army Corps of Engineers Dredge Biddle at themouth of the Columbia River fish6621.jpg The dredge head of the Army Corps of Engineers Dredge Biddle at themouth of the Columbia River](/sites/default/files/styles/max_1300x1300/https/s3.amazonaws.com/s3-east-testmedia-noaa.woc.noaa.gov/dam/Photos/legacy/pl23_fish6621.jpg?itok=KUN5Fice)
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The dredge head of the Army Corps of Engineers Dredge Biddle at themouth of the Columbia River. This huge machine had the capacity to operate at4 knots, load 3000 cubic yards in 40 minutes and discharge the same in 20minutes. (Image credit: NMFS/Northwest Fisheries Science Center; Pacific Northwest Collection)