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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 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 ...
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 ...
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 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 ...
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.
This is a list of Superfund sites in Montana designated under the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA) environmental law. The CERCLA federal law of 1980 authorized the United States Environmental Protection Agency (EPA) to create a list of polluted locations requiring a long-term response to clean up hazardous material contaminations. [1]
Lewis and Clark passed through Hellgate Canyon during their expedition through the Western United States. [1] Later in the 19th century, Carrie Strahorn, also an explorer, wrote about a stagecoach ride she took in the area in 1878. She described, among other things, a "veritable Lover’s Lane" formed above the canyon by an arch of wild roses. [5]