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During the existence of Lake Missoula, it was a drain for the Little Bitterroot basin when the lake level exceeded 3,620 feet (1,100 m) asl and for the Camas Prairie basin when the lake level exceeded 3,680 feet (1,120 m) asl. At the maximum depth of Lake Missoula, the valley was a 520-foot-deep (160 m) waterway.
After the lake drained, the ice would reform, creating Glacial Lake Missoula again. These floods have been researched since the 1920s. During the last deglaciation that followed the end of the Last Glacial Maximum , geologists estimate that a cycle of flooding and reformation of the lake lasted an average of 55 years and that the floods ...
Glacial Lake Missoula. Between 15,000 and 13,000 years ago, Glacial Lake Missoula formed when an ice sheet blocked the Clark Fork River, damming up the river's water back into the valleys of western Montana. [5] The dam would periodically burst causing a flood of water to rush across Idaho, Washington and Oregon to the Pacific Ocean.
The areas inundated in the Columbia and Missoula floods are shown in red. The Ice Age Floods National Geologic Trail is a network of routes connecting natural sites and facilities that provide interpretation of the geological consequences of the Glacial Lake Missoula floods of the last glacial period that occurred about 18,000 to 15,000 years ...
Glacial Lake Missoula: 1966 Sanders: private Contains the best examples of giant flood ripples in the North American continent. ...
The history of Missoula, Montana begins as early as 12,000 years ago with the end of the region's glacial lake period with western exploration dating back to the Lewis and Clark Expedition of 1804–1806. The first permanent settlement was founded in 1860.
J Harlen Bretz (2 September 1882 – 3 February 1981) was an American geologist, best known for his research that led to the acceptance of the Missoula Floods and for his work on caves. Early life and education
The meteorite presumably landed on an ice cap in what is now Montana or western Canada, and was dragged by the glacier ice to the vicinity of an ice barrier that formed across the Clark Fork River. This barrier had ponded a huge amount of water at Lake Missoula right at the time when the meteorite reached the area and the ice barrier became ...