The Missouri River: Ice Age Boundary Revealed
June 12, 2026
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0:39Now PlayingThe Missouri River: Ice Age Boundary Revealed
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as posted by the channelHe walks through the landscape with a map in mind, tracing the Missouri River's path and recognizing it as something far larger than what flows there today. The river follows the southern edge of where the Laurentide Ice Sheet once stood, a boundary that stretched thousands of miles north to the Arctic Ocean. What makes the Missouri remarkable is that it's what geologists call an underfit river: the channel is vastly oversized for the volume of water it currently carries. That mismatch tells a story. Thirteen thousand years ago, this wasn't just a river draining rainfall and snowmelt. It was the edge of a continent-scale ice sheet, and the forces that carved that valley were orders of magnitude greater than anything we see today.
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