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Crews from Air Station Traverse City, Michigan, measure ice thickness in preparation for the Great Lakes shipping season and the opening of the Soo Locks in Lake Superior March 17, 2015.

Coast Guard crews conduct ice breaking operations throughout the Great Lakes and are responsible for ensuring open shipping lanes prior to lock opening. U.S. Coast Guard photo. Original public domain image from Flickr

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Crews from Air Station Traverse City, Michigan, measure ice thickness in preparation for the Great Lakes shipping season and the opening of the Soo Locks in Lake Superior March 17, 2015.

More