Slumgullion Earthflow, Natural landslide formation in Hinsdale County, Colorado.
The Slumgullion Earthflow extends four miles through the San Juan Mountains, displaying yellowed soil and tilted trees indicating ground movement.
The initial landslide occurred 700 years ago when volcanic rock from Mesa Seco collapsed, creating a natural dam that formed Lake San Cristobal.
The geological formation received its name from early settlers who compared its yellow soil color to a common miners' stew of the 1800s.
Visitors can observe the earthflow from designated viewpoints along Highway 149, with the Windy Point Overlook offering clear views of the formation.
A second earthflow that began 300 years ago continues to move at rates up to 20 feet per year, making it an active geological study site.
Location: Colorado
GPS coordinates: 37.99170,-107.25700
Latest update: May 22, 2025 19:01
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