Coeur du Deluge Chapter

An Ice Dam Blocked the Clark Fork River

"ice dam on the clark fork"

Near the end of the last Ice Age, a lobe of the Cordilleran ice sheet over 40 miles wide and 3000 feet thick covered this area. It blocked the Clark Fork River, impounding over 500 cubic miles of water in a huge Glacial Lake Missoula covering much of western Montana.

When the lake reached about 2000 feet deep, the pressure of the water against the ice broke down the dam, releasing the lake water and icebergs from the broken dam in a huge Ice Age Flood that drained away in only a few days time.

This cycle repeated 40-100 times over a 5000 year period as the advancing ice lobe dammed the lake and subsequently collapsed again and again.

About Coeur du Deluge Chapter​

IAFI’s Coeur du Deluge Chapter serves the greater Sandpoint, Idaho area.

For more information about our chapter,
e-mail Julie Bishop.

For Ice Age Floods and Geology questions and information, email Mark Pullen, our Chapter technical expert.

President
Tony Lewis

Secretary/Treasurer
Julie Bishop

Technical Expert
Mark Pullen

Coeur du Deluge Chapter News

Coeur du Deluge Chapter News

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Upcoming IAFI Events

February 2025
Feb 11
February 11, 2025
Wenatchee Valley Museum and Cultural Center, 127 S. Mission
Wenatchee, WA United States
Feb 12
February 12, 2025
North Spokane Library, 44 E Hawthorne Rd
Spokane, WA 99218
Feb 18
February 18, 2025
Tualatin Heritage Center, 8700 SW Sweek Drive
Tualatin, OR 97062 United States

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