Quake Lake (officially Earthquake Lake) is a

lake A lake is an area filled with water, localized in a basin, surrounded by land, and distinct from any river or other outlet that serves to feed or drain the lake. Lakes lie on land and are not part of the ocean, although, like the much large ...

in the western

United States The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country primarily located in North America. It consists of 50 states, a federal district, five major unincorporated territori ...

, on the

Madison River The Madison River is a headwater tributary of the Missouri River, approximately 183 miles (295 km) long, in Wyoming and Montana. Its confluence with the Jefferson and Gallatin rivers near Three Forks, Montana forms the Missouri River. Th ...

in southwestern

Montana Montana () is a state in the Mountain West division of the Western United States. It is bordered by Idaho to the west, North Dakota and South Dakota to the east, Wyoming to the south, and the Canadian provinces of Alberta, British Columb ...

. It was created after an

earthquake An earthquake (also known as a quake, tremor or temblor) is the shaking of the surface of the Earth resulting from a sudden release of energy in the Earth's lithosphere that creates seismic waves. Earthquakes can range in intensity, fr ...

struck on August 17, 1959, with 28 fatalities. Northwest of West Yellowstone, Quake Lake is in length with a maximum depth of . U.S. Route 287 follows the lake and offers glimpses of the effects of the earthquake and landslide, and a visitor center is just off the road. The lake is mostly within Gallatin National Forest.

Earthquake

The earthquake measured 7.5 on the

Richter magnitude scale The Richter scale —also called the Richter magnitude scale, Richter's magnitude scale, and the Gutenberg–Richter scale—is a measure of the strength of earthquakes, developed by Charles Francis Richter and presented in his landmark 1935 ...

(revised by USGS to 7.3) and caused an 80-million ton landslide, which formed a

landslide dam A landslide dam or barrier lake is the natural damming of a river by some kind of landslide, such as a debris flow, rock avalanche or volcanic eruption. If the damming landslide is caused by an earthquake, it may also be called a quake lake. Some ...

on the

. The earthquake was the most powerful to hit the state of Montana in historic times. The landslide traveled down the north flank of Sheep Mountain, at an estimated , killing 28 people who were camping along the shores of Hebgen Lake and downstream along the Madison River. Upstream the faulting caused by the earthquake forced the waters of Hebgen Lake to shift violently. A

seiche A seiche ( ) is a standing wave in an enclosed or partially enclosed body of water. Seiches and seiche-related phenomena have been observed on lakes, reservoirs, swimming pools, bays, harbors, caves and seas. The key requirement for formation of ...

, a wave effect created by

wind Wind is the natural movement of air or other gases relative to a planet's surface. Winds occur on a range of scales, from thunderstorm flows lasting tens of minutes, to local breezes generated by heating of land surfaces and lasting a few ho ...

, atmospheric pressure, or seismic activity on

water Water (chemical formula ) is an Inorganic compound, inorganic, transparent, tasteless, odorless, and Color of water, nearly colorless chemical substance, which is the main constituent of Earth's hydrosphere and the fluids of all known living ...

, crested over Hebgen Dam, causing cracks and erosion. The earthquake created

fault scarp A fault scarp is a small step or offset on the ground surface where one side of a fault has moved vertically with respect to the other. It is the topographic expression of faulting attributed to the displacement of the land surface by movement a ...

s up to high in the area near Hebgen Lake and the lake bottom itself dropped the same distance. of the area near Hebgen Lake subsided more than . Several

geysers A geyser (, ) is a spring characterized by an intermittent discharge of water ejected turbulently and accompanied by steam. As a fairly rare phenomenon, the formation of geysers is due to particular hydrogeological conditions that exist only in ...

in the northwestern sections in

Yellowstone National Park Yellowstone National Park is an American national park located in the western United States, largely in the northwest corner of Wyoming and extending into Montana and Idaho. It was established by the 42nd U.S. Congress with the Yellowst ...

erupted and numerous hot springs became temporarily muddied. Within the immediate vicinity of the earthquake and resultant landslide, a few dozen cabins and homes were destroyed. Overall damages to buildings and roads were minor with damage costs placed at 11 million

dollars Dollar is the name of more than 20 currencies. They include the Australian dollar, Brunei dollar, Canadian dollar, Hong Kong dollar, Jamaican dollar, Liberian dollar, Namibian dollar, New Taiwan dollar, New Zealand dollar, Singapore dollar, U ...

in 1959. Aftershocks up to 6.5 on the Richter magnitude scale continued for several months. At the time, the quake was the second largest to occur in the continental US during the 20th century.

Hebgen Dam and creation of the lake

Hebgen Dam, built in 1917, is a

concrete Concrete is a composite material composed of fine and coarse aggregate bonded together with a fluid cement (cement paste) that hardens (cures) over time. Concrete is the second-most-used substance in the world after water, and is the most wid ...

core and rock fill faced structure that sustained severe damage but continued to hold. Repairs were completed on the dam spillway in a few weeks. The landslide, which occurred downstream from the dam, blocked almost all the flow of the Madison River which began to fill in the void upstream from the slide. In less than a month, the waters had created what is now known as Quake Lake. The lack of a reliable water outlet for this new lake forced one of the largest mobilizations of the U.S. Army Corps of Engineers ever commenced in the western U.S. Before the new landslide was breached by the quickly rising waters, a

spillway A spillway is a structure used to provide the controlled release of water downstream from a dam or levee, typically into the riverbed of the dammed river itself. In the United Kingdom, they may be known as overflow channels. Spillways ensure th ...

was constructed to ensure erosion and potential failure of the natural dam would be minimized.

Visitors center

In 1967, the U.S. Forest Service's Earthquake Lake Visitor Center opened its doors for the first season of operation. The center provides interpretive services for more than 50,000 visitors annually. The center provides a panoramic view of the mountain that fell and the lake that was formed. This facility hosts interpretive displays on earthquakes, plate tectonics, and a working seismograph. It is located in

Custer Gallatin National Forest The Gallatin National Forest (now known as the Custer-Gallatin National Forest) is a United States National Forest located in South-West Montana. Most of the Custer-Gallatin goes along the state's southern border, with some of it a part of North- ...

References

External links

Quake Lake Bathymetric Map
Montana Fish, Wildlife & Parks {{authority control Lakes of Montana Earthquakes in Montana Bodies of water of Gallatin County, Montana Lakes of Madison County, Montana Natural disasters in Montana Natural history of Montana Geology of Montana 1959 natural disasters 1959 natural disasters in the United States Gallatin National Forest Landslide-dammed lakes 1959 establishments in Montana