A set of locks for an Ohio River dam in Kentucky is closed due to a "navigational incident" after 10 barges were released from a tugboat, including one barge carrying 1,400 tons of a toxic alcohol compound, officials said. A set of locks for an Ohio River dam in Kentucky is closed due to a \"navigational incident\" after 10 barges were released from a tugboat, including one barge carrying 1,400 tons of a toxic alcohol compound, officials said. \"The closest water intake on the Ohio River from the affected dam is in Henderson, Kentucky -- more than 100 miles away from Louisville, according to the Kentucky Energy and Environment Cabinet