Slumgullion Earthflow
A National Natural Landmark in Colorado, known for its rare, slow-moving landslide (mass wasting) that formed Lake San Cristobal and actively moves at about 20 feet per year.

šŸ“œ A National Natural Landmark since 1983, the Slumgullion Earthflow is a unique, slow-moving landslide in Hinsdale County, Colorado.
šŸ” This active geological phenomenon, also known as mass wasting, has been continuously moving for about 300 years and formed Lake San Cristobal centuries ago.

Why Go

šŸžļø Witness a rare, active geological wonder (mass wasting)
šŸŒ² Observe tilted trees, evidence of active movement
šŸš— Enjoy scenic views from pullouts along Highway 149
šŸ‚ Experience spectacular aspen colors in the fall

Why Avoid

āš ļø Increased traffic during peak fall viewing season

Tips

šŸ“ Numerous pullouts along CO 149 offer information and views.
šŸ Fall is the best time to view due to aspens, but expect increased traffic.
šŸ”­ Windy Point Overlook provides great views of the slide and San Juan Mountains.
šŸ—“ļø Flow rate varies, faster in summer, slower in winter.

šŸ…æļø Parking

Free pullouts available along CO-149.

šŸ•ļø Camping

Slumgullion Campground nearby with 21 first-come, first-serve campsites, vault toilets available.

Last updated 1 day ago

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