Ice Age Floods

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About Ice Age Floods

During the last ice age 12,000-15,000 years ago, a finger of the enormous Cordilleran Ice Sheet stretched down from Canada and blocked the flow of the Clark Fork River in northwestern Montana. Five hundred cubic miles of water backed up behind the ice dam, creating Glacial Lake Missoula -- a huge inland sea. When the ice dam broke, catastrophic floods ripped across Idaho, Washington and Oregon all the way to the Pacific Ocean.

This happened over and over, sculpting the landscape of the Pacific Northwest -- from the giant ripple marks of Montana's Camas Prairie and the channeled scablands of eastern Washington to the spectacular beauty of the Columbia Gorge and the fertile soils of the Willamette Valley in Oregon.

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Please share your photos of these geologic wonders and other images related to Glacial Lake Missoula and the Pacific Northwest's ice age floods.

Photos not relevant to the floods will be deleted. Thank you.