Flood of Change

At the end of the last Ice Age, about 18,000 to 15,000 years ago, an ice dam in northern Idaho created Glacial Lake Missoula in Montana. The ice dam burst and released flood waters across Washington and down the Columbia River back flooding into Oregon before eventually reaching the Pacific Ocean. Happening perhaps a 100 times. Forever changing the lives and landscape of the Pacific Northwest.

A former Ice Age Flood water fall

Dry Falls

Four times larger than Niagara Falls, Dry Falls was the largest waterfall known on earth at 3.5 miles (5.6 km) wide and 400 feet (12mm) tall

Last updated: March 23, 2021

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Mailing Address:

Program Manager
Ice Age Floods National Geologic Trail
1008 Crest Drive

Coulee Dam, WA 99116


(509) 237-9722

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