Alluvial Fan, in Rocky Mountain National Park, was created in 1982 when the water of Lawn Lake burst through the earthen Lawn Lake Dam. Millions upon millions of gallons of water rushed down towards the valley below, bringing trees and large boulders along for the ride. The large boulders within this waterfall are just a small sampling of the massive amount of boulders strewn about Alluvial Fan. The water which brought these boulders here on that July day in 1982 was so massive in volume and fast flowing that it left the nearby town of Estes Park flooded under six feet of water. Today the site is a popular attraction for visitors to Rocky Mountain National Park, easily accessible and a reminder of the powerful capabilities of nature.