An Oil Spill Shut Down a Great Lakes Shipping Route but You Probably Didn't Hear About It

On Thursday afternoon, an oil spill into the St. Mary’s River at the Ontario, Canada-Michigan border halted boat traffic between Lake Superior and Lake Huron for about three hours.

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source https://gizmodo.com/oil-spill-lake-superior-lake-huron-water-advisory-1849045010