Ice Age Floods of Change

At the end of the last Ice Age, 18,000 to 15,000 years ago, an ice dam in northern Idaho created Glacial Lake Missoula stretching 3,000 square miles around Missoula, Montana. The dam burst and released flood waters across Washington, down the Columbia River into Oregon before reaching the Pacific Ocean. The Ice Age Floods forever changed the lives and landscape of the Pacific Northwest.

Map of the Ice Age Floods across the Pacific Northwest

Ice Age Floods National Geologic Trail

Map of the Ice Age Floods across the Pacific Northwest

Image of Columbia National Wildlife Refuge and the Channel Scabland of the Drumheller Channels

Ice Age Floods "Places To Go"

Follow the Ice Age Floods across modern day Montana, Idaho, Washington and Oregon.

Last updated: August 31, 2022

Park footer

Contact Info

Mailing Address:

Program Manager
Ice Age Floods National Geologic Trail
1008 Crest Drive

Coulee Dam , WA 99116

Phone:

(509) 237-9722

Contact Us

Tools

Stay Connected