In this Feb. 7, 2014 photo provided by the U.S. Coast Guard the icebreaker Katmai Bay escorts the lgo Steel with a load of road salt through the Straits of Mackinac. Sections of the lakes harden almost every winter keeping the Coast Guard’s fleet of nine icebreakers busy clearing paths for vessels hauling essential cargo such as heating oil, salt and coal. This year has been one of the roughest winters in memory. (AP Photo/U.S. Coast Guard, Lt. Michael Patterson)
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