NTSB Factual Report

During the landing roll on a gravel bar adjacent to a river, the airplane's right main landing gear contacted soft terrain. After contact with the soft terrain, the right main landing gear separated from the airframe and the airplane came to rest upright. The airplane sustained substantial damage to its fuselage. The pilot reported no preaccident mechanical malfunctions or failures with the airplane that would have precluded normal operation.

NTSB Probable Cause

The pilot's selection of unsuitable terrain for landing, resulting in abnormal contact with terrain.