In this Feb. 5, 2014 photo photo provided by the U.S. Coast Guard a yardstick measures the thickness of some of the ice the crew of cutter Katmai Bay, background, battles during ice-breaking operations in the Straits of Mackinac. The icebreaker Mackinaw maintains a shipping lane on the Great Lakes which are almost completely covered with ice for the first time since 1994. (AP Photo/U.S. Coast Guard, Lt. Michael Patterson)
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