Gros Ventre landslide

The Gros Ventre landslide is seven miles (11 km) east of Jackson Hole valley and Grand Teton National Park.

[2] The landslide created a large dam over 200 feet (61 m) high and 400 yards (370 m) wide across the Gros Ventre River, backing up the water and forming Lower Slide Lake.

On May 18, 1927, part of the landslide dam failed, resulting in a massive flood that was six feet (1.8 m) deep for at least 25 miles (40 km) downstream.

It is one of the world's largest known examples of recent mass wasting events aside from volcanic eruptions.

Today, the landslide is partially reclaimed by the surrounding forest but is still an obvious landmark from many vantage points in the Jackson Hole valley.