Idaho State

Montana Clark Fork River and Green Monarch Ridge
Clark Fork River and Green Monarch Ridge

NPS

Idaho State is known as the "Breakout Zone" for the story of the Ice Age Floods. The Ice Age Floods broke loose and helped form Lake Pend Oreille in northern Idaho. Glacial deposits and remnants of the Ice Age Floods litter the surrounding area. Many of the other lakes in the region owe there origin to Ice Age Floods deposits. Explore Idaho and learn more about how the Ice Age Floods impacted the region below.
 
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    Last updated: March 31, 2023

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    Mailing Address:

    Program Manager
    Ice Age Floods National Geologic Trail
    1008 Crest Drive
    Coulee Dam, WA 99116

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    (509) 237-9722

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