Slumping of Highway into Hebgen Lake, Montana EARTHQUAKES!

Slumping of Highway into Hebgen Lake, Montana

Earthquake of August 18, 1959, Hebgen Lake, Montana. The magnitude 7.1 earthquake killed 28 people and caused 11 million property damage. [GROUND DEFORMATION-SLUMPING] A section of Highway 287 has crumbled into Hebgen Lake. Landslides, submersion, cracking, and shifting of the roadway made the road impassable for a distance of nearly 58 km. Over 200 vacationers were trapped in Madison Canyon when the earthquake destroyed whole sections of highway. Timber and road damage were estimated at 11 million. Photograph Credit: University of California, Berkeley.