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The Missoula floods (also known as the Spokane floods, the Bretz floods, or Bretz's floods) were cataclysmic glacial lake outburst floods that swept periodically across eastern Washington and down the Columbia River Gorge at the end of the last ice age.
Lake Missoula was a prehistoric proglacial lake in western Montana that existed periodically at the end of the last ice age between 15,000 and 13,000 years ago. The lake measured about 7,770 square kilometres (3,000 sq mi) and contained about 2,100 cubic kilometres (500 cu mi) of water, half the volume of Lake Michigan .
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 ...
A simulation of the failure of the Lake Missoula Ice Dam Archived 2006-09-11 at the Wayback Machine; Columbia River Flood Basalts; U.S. Geological Survey Geographic Names Information System: Wallula Gap
But the scientific community gradually began to agree that an ice dam holding back the waters of Glacial Lake Missoula in present day Western Montana 18,000 to 15,000 years ago resulted in huge ...
Giant current ripples are an important feature of the Channeled Scablands in Washington state, U.S., which formed during the Last Glacial Maximum as a result of at least 39 glacial lake bursts, called the Missoula floods, which originated from glacial lakes Columbia in Washington and Missoula in Montana. [10] [11] [12] [13]
The 500 cubic miles (2,100 km 3) of water in Lake Missoula was released in just 48 hours—a torrential flood equivalent to ten times the combined flow of all the rivers in the world. This mass of water and ice, 2,000 feet (610 m) high near the ice dam before release, flowed across the Columbia Basin, moving at speeds of up to 65 miles per hour ...
The Missoula megafloods carved deep channels and towering cliffs across the landscape, and are among the largest known floods in Earth’s history. Largest floods in Earth’s history ‘were ...