This is my favorite landslide in the world, mainly for personal reasons. My family had a place high in the San Juan Mountains of SW Colorado for many years when I was in college and grad school. We could see part of the 'Slumgullion slide' from our kitchen and crossed it in (yes) snowmobiles many times in the winters between 1984 and 1998 or so.

The flagrant head scarp / source area

Tango and I at the outermost tension crack above the head scarp (back in 1995 or so)

The sheer severity of the head scarp.

It is a late Holocene feature between about 300 and 600 years old. The landslide created a dam on the Lake Fork of the Gunnison River just upstream of Lake City, Colorado to create Lake San Cristobal. I believe that the lake is the second largest natural lake in Colorado.

It is a spectacularly well-expressed earth flow with an obvious source area and terminus. Wonder how long it can hold back the lake? Note that an older late Holocene earthflow once dammed the river downstream near Lake City but is now gone. Keep in mind that the failure of a landslide dam is one of the best ways to create a truly catastrophic flood.

Nice shot of Lake San Cristobal in the fall (sometime in the early 90s)

Ideal perspective afforded by Google Earth.

Take me there.