U.S. Coast Guard

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In this Jan. 10, 2014 photo provided by the U.S. Coast Guard are Great Lakes freighters Arthur M. Anderson, left, and James R. Barker, seen from the icebreaker Mackinaw, on the St. Marys River, which links Lakes Superior and Huron. The cutter Mackinaw has just finished escorting the Barker along the river and is preparing to break a trail in the ice for the Anderson. (AP Photo/U.S. Coast Guard, Lt. David Lieberman)

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In this Feb. 12, 2014 File photo provided by the U.S. Coast Guard the icebreaker Biscayne Bay passes Chicago's Navy Pier, left, as it through the ice covered waters of Lake Michigan on it's way to Indiana. (AP Photo/U.S. Coast Guard, Chief Petty Officer Alan Haraf) **FILE**

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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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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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In this Dec. 26, 2013 photo provided by the U.S. Coast Guard the icebreaker Mackinaw maintains a shipping lane on the St. Marys River linking Lakes Superior and Huron. It’s been so bitterly cold for so long in the Upper Midwest that the Great Lakes are almost completely covered with ice. The last time they came this close was in 1994, when 94 percent of the lakes’ surface was frozen. (AP Photo/U.S. Coast Guard

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**FILE** Crewmen on a U.S. Coast Guard vessel watch the first heat of the first round of the Mavericks Invitational big wave surf contest Friday, Jan. 24, 2014, in Half Moon Bay, Calif. (AP Photo/Eric Risberg)

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The freighter Algosea, passes by the U. S. Coast Guard cutter Neah Bay on the St. Clair River Wednesday, Jan. 15, 2014 while the coast guard breaks up the ice. Ice breaking crews have been working long hours to clear a way for commercial vessels. (AP Photo/Times Herald,Beth Leblanc)

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In this image from video provided by the U.S. Coast Guard a Coast Guard helicopter crew hoists one of four people from the 42-foot sailboat Be Good Too, background, about 300 miles off Virginia's coast Tuesday Jan. 14, 2014. Be Good Too was headed to the British Virgin Islands from New York when the crew contacted the Coast Guard on Monday. The Coast Guard says the crew reported that the sailboat was disabled and adrift. The sailboat's crew was rescued around 9:15 a.m. Tuesday. (AP Photo/US Coast Guard)