Between 1972 and 1990 the authors evaluated prospectively 6671 injuries reported to the injury clinic operated in the base lodge of a moderate size northern Vermont ski area. During that time approximately 2 032 000 skier-visits occurred at the area. The overall injury rate decreased by 48% during the study. Lower leg injuries improved the most with an 83% reduction noted. Overall, the incidence of knee ligament injuries didn't change significantly. However, the incidence of minor to moderate injuries did diminish by 70% while severe knee sprains, usually involving the anterior cruciate ligament, increased very significantly (209%). In general, the incidence of upper body injuries did not change although upper body lacerations and thumb ulnar collateral ligament sprains improved by 55% and 59% respectively, while clavicular fractures increased in incidence significantly (176%).