1959 Hebgen Lake earthquake is located in Montana

The landslides caused by the quake carried 80 million tons (40 million cubic yards) of rock, mud and debris down into the valley and created hurricane-force winds strong enough to toss cars. In Madison Canyon, the landslide swept away a family of seven, five of whom perished. Two more fatalities were also reported in nearby Cliff Lake to the south. In Rock Creek, tourists camping there were caught off guard by the quake and landslide, which swept them into the creek. The landslide caused a seiche which inundated trailers and tents, uprooted trees, and injured one additional person.^[6]

• http://en.wikipedia.org/wiki/1959 Hebgen Lake earthquake
• Page 106 - Dicka, A. B., 2012, 101 American Geo-sites you've gotta see: Mountain Press Publishing Co., 250p.