Mammoth was founded by Dave McCoy, a hydrographer for the Los Angeles Department of Water and Power. As a member of the Eastern Sierra Ski Club in the 1930s, McCoy noticed that Mammoth Mountain consistently held more snow than other mountains. The Ski Club had a portable rope tow. McCoy bought the rope tow from the club in 1941 and usually kept it at Mammoth. In 1953, the United States Forest Service awarded a permit to McCoy to operate the ski area, and the first ski lift was built in 1955.