Slumgullion Earthflow Overlook, Colorado

On the western side of Spring Creek Pass is the scenic valley of the Lake Fork River, which flows into the Gunnison north of Lake City. A few miles before the pass, the Slumgullion Earthflow Overlook reminds travelers of the fluidity of even these massive Rocky Mountains. 850 years ago a massive slide, the Slumgullion Earthflow, dammed the Lake Fork River and created Lake San Cristobal, forming the second largest natural lake in the state. The hillside is still moving, they say, at a rate of around 20 feet per year.