The Paul R. Tregurtha, hauling a full load of coal, ran aground in the Duluth harbor on Saturday, the Duluth News Tribune reported.
At 1,013.5 feet from stem to stern, the longest ship on the Great Lakes spent about four hours aground near the Bayfront Festival Park before being set free by two tugboats.
"It was making the turn to go under the lift bridge, but it didn't turn," Adele Yorde, spokeswoman for the Duluth Seaway Port Authority, told the newspaper. "It went straight toward Bayfront Park" at about 3:20 p.m.
There were no known injuries and no signs of pollution, the Coast Guard said.
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