Photos: Lake Superior's annual ice-breaking ritual

The U.S. Coast Guard cutter Alder breaks ice and creates navigation lanes for the opening of the maritime shipping season on Friday in the Duluth-Superior harbor, "taking all the bigger pieces of ice that we find, making them a little bit smaller, and just grooming a path, just like your cross country ski path," said Lt. Daniel Kubasch, the executive officer onboard.
Derek Montgomery for MPR News
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