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These floods were the result of periodic sudden ruptures of the ice dam on the Clark Fork River that created Glacial Lake Missoula. After each ice dam rupture, the waters of the lake would rush down the Clark Fork and the Columbia River, flooding much of eastern Washington and the Willamette Valley in western Oregon. After the lake drained, the ...
The Clark Fork, or the Clark Fork of the Columbia River, is a river in the U.S. states of Montana and Idaho, approximately 310 miles (500 km) long. It is named after William Clark of the 1806 Lewis and Clark Expedition .
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 ago.
It is named for the city of Missoula in the upper reaches of the Clark Fork watershed. The mountains surrounding the city show the strandlines from the lake nearly 20,000 years ago. [ 8 ] At its largest extent, Lake Missoula's depth exceeded 2,000 feet (610 m) and may have held 600 cu mi (2,500 km 3 ) of water, as much as Lake Erie and Lake ...
Hell Gate lay at the west end of the Missoula Valley. About 13,000 BCE, the advance of the Cordilleran Ice Sheet created an ice dam on the Clark Fork which created Glacial Lake Missoula. [3] After the Missoula Floods and the final draining of Glacial Lake Missoula about 11,000 BCE, the lake sediment dried and became the fertile Missoula Valley ...
It is generally accepted that this process of ice-damming of the Clark Fork, refilling of Lake Missoula and subsequent cataclysmic flooding happened dozens of times over the years of the last Ice Age. [2] [4] This sudden flood put parts of Idaho, Washington, and Oregon under hundreds of feet of water in just a few days. These extraordinary ...
The Clark Fork River Operable Unit. The Milltown Reservoir Sediments Superfund Site is a major Superfund site in Missoula County, Montana, seven miles east of Missoula. It was added to the National Priorities List in 1983 when arsenic groundwater contamination was found in the Milltown area. The contamination resulted from a massive flood three ...
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