On June 1, 2003, about 2000 eastern daylight time, a Stinson 108-1, N8278K, piloted by a private pilot, sustained substantial damage when the right main landing gear collapsed during landing rollout on runway 32 (3,920 feet by 49 feet, asphalt) at the Riverview Airport, Jenison, Michigan. Visual meteorological conditions prevailed at the time of the accident. The personal flight was operating under the provisions of 14 CFR Part 91 without a flight plan. The pilot and two passengers reported no injuries. The flight departed from a private airstrip near Hudsonville, Michigan. The pilot stated that upon touchdown the airplane instantly veered to the left. The pilot reported that he applied full right rudder and the brakes, but could not regain control of the airplane. The pilot stated that the right wing came in contact with the ground, and the right landing gear collapsed. The airplane then "slid" off the left side of the runway, and the propeller struck the ground twice before the airplane came to a full stop.