The landslide roared down the south flank of Sheep Mountain, at an estimated 100 miles per hour (160 km/h), killing 33 people who were camping along the shores of Hebgen Lake and downstream along the Madison River.
The landslide roared down the south flank of Sheep Mountain, at an estimated 100 miles per hour (160 km/h). A wave effect of both wind and water, crested over Hebgen Dam, killing 33 people who were camping along the shores of Hebgen Lake and downstream along the Madison River.