Ice Age Floods National Geologic Trail – Montana

NATIONAL GEOLOGIC TRAIL

Ice Age Floods

WA,OR,ID,MT

“At the end of the last Ice Age, some 12,000 to 17,000 years ago, a series of cataclysmic floods occurred in what is now the northwest region of the United States, leaving a lasting mark of dramatic and distinguishing features on the landscape of parts of the States of Montana, Idaho, Washington and Oregon.” Public Law 111-11, March 30, 2009