Earthquake Lake: The Mountain That Became the Lake

Northwest of West Yellowstone on United States Highway Two Eighty-Seven lies one of the most accessible active geology sites in the American West. In August of nineteen fifty-nine, an earthquake triggered a massive landslide in the Madison River canyon. The wall of rock debris completely dammed the Madison River, and the lake that formed behind it is now called Earthquake Lake, or Quake Lake.

The United States Forest Service manages the Madison River Canyon Earthquake Area as a free interpretive site, and it is one of the more haunting landscapes in the greater Yellowstone region. The visitor center gives a panoramic view of the mountain that fell and the lake that formed. Beneath the surface, preserved in underwater silence, is campgrounds where many of the twenty-eight people killed by the earthquake died that night. Dead trees still stand upright in the lake, their trunks and bare branches marking where ground was once solid earth. The sight of those pale deadwood trunks emerging from still water, pointing upward toward a sky they will never reach again, makes the scale of what happened here comprehensible in a way that no interpretive sign alone can manage.

Upstream from the lake, the raised shorelines of Hebgen Lake remain visible where the earthquake tilted the earth and the water redistributed into a new configuration. A tilted cabin that sat on the newly angled ground has been preserved as a standing interpretive feature. The landscape here is still adjusting. The geology is not done with this place, and probably will not be for a very long time.