Stock Photo - Sault Ste Marie, Michigan - The Hon James L Oberstar, a Great Lakes bulk cargo freighter, approaches the Soo Locks, which enable shipping between Lake Superior and the lower Great Lakes. Operated by the U. S. Army Corps of Engineers, the locks raise or lower ships 21 feet.

Stock Photo: Sault Ste Marie, Michigan - The Hon James L Oberstar, a Great Lakes bulk cargo freighter, approaches the Soo Locks, which enable shipping between Lake Superior.

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