The world's largest historic landslide (in terms of volume) occurred during the 1980 eruption of Mount St. Helens, a volcano in the Cascade Mountain Range in the State of Washington, USA. The volume of material displaced was . Directly in the path of the huge mudflow was Spirit Lake. Normally a chilly , the lahar instantly raised the temperature to near . Today the bottom of Spirit Lake is above the original surface, and it has two and a half times more surface area than it did before the eruption.