Glacial Lake Missoula Chapter

The Source of Bretz's Floods

"the source"

The source of the massive flood waters responsible for J Harlan Bretz’s 1922 “Outrageous Hypothesis” of catastrophic floods having carved the central Washington basin, was not generally recognized until Joseph Pardee’s 1940 publication of his research on Glacial Lake Missoula.

Pardee described ancient wave-cut benches, giant megaripples and many other features that indicated a giant lake had once occupied much of western Montana, and that the lake had drained catastrophically through Eddy Narrows, directly into the area of central Washington that Bretz described.

IAFI’s Glacial Lake Missoula Chapter has placed a number of “high water markers” around the area of the lake, and is actively collaborating with other local organizations to tell the story of Glacial Lake Missoula and the Ice Age Floods.

Glacial Lake Missoula Chapter

IAFI’s Glacial Lake Missoula Chapter serves the greater western Montana area

Chapter Meetings
We meet the third Wednesday of the month as needed at the Montana Natural History Center, 120 Hickory Street in Missoula. Contact Jennifer Robinson at (406) 327-0405 or email glm@montananaturalist.org for more meeting or event information.

E-mail or call Jim Shelden (406) 728-1860 for more information about the chapter

Please see the Events Calendar for a listing of all chapter meetings and events.

Glacial Lake Missoula Chapter News

Glacial Lake Missoula Chapter & IAFI News

Chapter Events and Location Map

Upcoming IAFI Events

March 2024
April 2024
Apr 05
April 05, 2024
Central Washington University, 400 E University Way
Ellensburg, WA 98926 United States
Apr 12

Chapter Location

Upcoming Chapter Events

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