The airplane struck a log during landing rollout in a dry riverbed. The Federal Aviation Administration (FAA) was notified that an airplane had been seen in a dry riverbed. FAA inspectors went to the site the next day and found the airplane in the riverbed with a collapsed right landing gear strut. They found tracks in a straight line from the touchdown point to the impact point with no indications of a turn. The pilot said he made a precautionary landing in the dry riverbed to troubleshoot engine problems.