On May 30, 2003, at approximately 0850 mountain daylight time, a Champion 7GC, N5923L, was substantially damaged during landing roll at Natrona County International Airport (CPR), Casper, Wyoming. The private pilot, the sole occupant on board, was not injured. Visual meteorological conditions prevailed for the local flight being conducted under Title 14 CFR Part 91. The flight originated at 0840. According to the pilot, he was doing touch and goes on runway 30. During the landing, all three wheels touched down and "the plane immediately went to the right." As the pilot added left rudder to recover, the wing "started to lift." The pilot countered with right aileron, full left rudder and left brake. Subsequently, the left wing dropped, hit the ground, and the airplane came to a stop. The pilot taxied back to the hangar. Postaccident examination revealed the left, aft wood spar was broken, and the left aileron was bent. The pilot reported he had logged a total of .7 hours in the Champion 7GC.