On September 4, 1999, approximately 0830 mountain daylight time, a Bellanca 7GCBC, N8525, registered to and operated by the pilot, was substantially damaged in a ground loop on landing at Columbus, Montana. The private pilot-in-command and his passenger were not injured in the accident. The 14 CFR 91 personal flight originated at Laurel, Montana, about 30 minutes prior to the accident. Visual meteorological conditions prevailed and no flight plan had been filed for the flight. In a written statement, the pilot reported that the runway was wet or damp. The sky was clear, with calm winds. During the landing roll, braking action was applied and the aircraft skidded to the right and veered off the runway. The aircraft ground-looped and came to rest in the mud next to the runway. The pilot reported that there were no mechanical failures or malfunctions with the aircraft at the time of the accident.