An old glacial lake that met a sudden end.
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It’s estimated that the biggest flood discharge reached 386 million cubic feet per second. At that rate, it took the lake only a few days to drain, with its waters eventually reaching the Pacific Ocean.
The scariest thing is not the scale of this event—it's that floods of this size happened multiple times. Thousands of years after that first flood, scientists finally pieced together whether it was a one-time deal by looking to the dirt for answers.
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