 During the Ohio River flood of 1937, the airfield and two-story main terminal building at the southwest corner of the airport were submerged, except for the third-floor air traffic control "tower".A plaque (which appears from ground level to be a single black brick) on the terminal building, facing the airfield, indicates the high-water mark.In the early 1960s Conrad International Corporation, which upgraded Beechcraft 18s, was located at the airport.