Fire at Columbia Ranch, May 26 1950
"One witness compared the blaze to the Bikini A-bomb burst..."
From Jerry Schneider: "There were three additional fires in 1970: 4-9-70, 8-10-70, and another one which was prior to August. The August one was the largest, destroying many sets. There were also fires on the ranch on 2-3-62 and 9-8-74, according to newspaper accounts."