The Coast Guard has fined a freighter $5,000 for not promptly reporting that it ran aground.

The Coast Guard said in a news release Thursday that the 670-foot, U.S.-flagged cargo ship Herbert C. Jackson ran aground June 1 in the Saginaw River near Bay City but the incident went unreported for about four months until an internal ballast tank survey by the crew uncovered the full extent of the damage.

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The Coast Guard said the ship’s owner, the Interlake Steamship Co. of Richfield, Ohio, failed to report the incident promptly as required by federal law.

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A message seeking comment was left with the company Thursday.

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