On August 7, 1994, about 0955 central daylight time, a Piper PA- 28-181 airplane, N6205J, sustained substantial damage when it ran off the end of runway 18 while landing at the Tri County Airport, Lone Rock, Wisconsin. The pilot and two of the three passengers aboard were not injured; the remaining passenger reported minor injury. The personal flight operated under 14 CFR Part 91 in visual meteorological conditions without a flight plan. The flight departed Madison, Wisconsin, about 0930. The pilot wrote in his statement to the NTSB that his first approach to land at the Tri County Airport was too high and fast, and he elected to do a go-around. On his second approach, he said that the airspeed was a little high when he flared (about 90 knots), and that he touched down about midfield. He was unable to stop the airplane before it ran off the end of the 2577' runway, into a corn field and collapsed the main landing gear. No preimpact mechanical anomalies were claimed by the pilot or discovered during a postaccident inspection.