Missoula Floods

During the Last Ice Age, the repeated episodic freezing and melting of glaciers near Lake Missoula in western Montana resulted in an estimated 25 cataclysmic floods from ruptured ice dams. The massively destructive floods, which came to be known as the Missoula Floods, carved out huge swaths of the Pacific Northwest, including Washington’s vast Columbia Valley now the state’s largest wine growing region at 11 million acres.

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