Investigators are trying to figure out why a ski boat crashed into the Mel Price Locks and Dam on the Mississippi River killing four people from Jefferson County. Three of those killed are from Festus. One is from DeSoto. All were found in the forward cabin of the boat. Two other people were seriously hurt. The boat hit the top of a steel gate that separates the piers of the dam. One observer says the boat’s operator might have thought it was going under a bridge as it approached it in the dark.