About 12,000 years ago, the valleys of western Montana lay beneath a lake nearly 2,000 feet deep. Glacial Lake Missoula formed as the Cordilleran Ice Sheet dammed the Clark Fork River just as it entered Idaho.

Glacial Lake Missoula at highest level of about 4200 ft. White area is ice, including Flathead Lake.

12,000 years ago, a large mass of glacial ice blocked the path of the Clark Fork River at the Montana/Idaho border. As the water rose behind this 2,000 foot high, 35 mile wide ice dam, it flooded the valleys of Western Montana. At its great-est …

It is the largest natural freshwater lake west of the Mississippi River, now partially controlled by a hydro-electric dam at its southern end. During the era of Glacial Lake Missoula, the lake was probably a frozen block of ice abutting the mountains of …

These features include erratics, strandlines or shorelines, rhythmites, giant ripples or current dunes, high eddy gulch fill, kolks, and a lake. A map and guide to those features is available in our brochure and can be printed or downloaded.

Missoula, MT 59801 (406) 327-0405 Exhibit of the floods story including short videos on several features on iPads and a display on the life of J.T. Pardee, who lived in this area.

information about Glacial Lake Missoula, view artifacts from the life of J.T. Pardee, pick up a map of the National Ice Age Floods Geologic Trail, and collect an official NPS

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Glacial Lake Missoula Tour stops Below are the stops for the GLM tour. You can find these on a separate map located next to where the map link was found on the website.

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