When Glacial Lake Missoula's ice dam shattered, a northern arm of the lake drained in a matter of hours through a narrow gap in Montana's Blackfoot River valley. One can only imagine the ...

forming glacial lakes Columbia and Missoula. Glacial Lake Missoula was metastable and its ice dam released episodic megafloods, whereas glacial Lake Columbia was stable and did not drain through its ...

Water has been accumulating in the lake over the past 20 years, but it recently reached a critical point, causing the glacier to lift ... of the last Ice Age, Lake Missoula had an outburst that ...