Clark Fork River
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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 long. It is named after William Clark of the 1806 Lewis and Clark E
The Clark Fork at Missoula, Montana
Clark Fork flowing through downtown Missoula (2003)
The mouth of the Clark Fork on Lake Pend Oreille in Idaho
Missoula, Montana
Glacial Lake Missoula
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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 3,000 square mi
Clark Fork River
…southern edge of the Cordilleran Ice Sheet covering western North America. The encroachment of the ice sheet formed an ice dam on the river, creating Glacial Lake Missoula, which stretched through the Clark Fork Valley across central Montana. The periodic rupturing and rebuilding of the ice dam released the Missoula Floods…
Wave-cut strandlines cut into the slope at left in photo. These cuts record former high-water lines, or shorelines. Gullies above the highway are the result of modern-day erosion. (NPS Photo)
Sediment deposited by the lake with a hammer for scale.