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roxyamused t1_jbwgvyi wrote

The deluge! It’s why there’s the gorge amphitheater and the “scarred land”. Called the Missoula Floods.

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WikiSummarizerBot t1_jbwgwzw wrote

Missoula floods

>The Missoula floods (also known as the Spokane floods or the Bretz floods or Bretz's floods) were cataclysmic glacial lake outburst floods that swept periodically across eastern Washington and down the Columbia River Gorge at the end of the last ice age. These floods were the result of periodic sudden ruptures of the ice dam on the Clark Fork River that created Glacial Lake Missoula. After each ice dam rupture, the waters of the lake would rush down the Clark Fork and the Columbia River, flooding much of eastern Washington and the Willamette Valley in western Oregon. After the lake drained, the ice would reform, creating Glacial Lake Missoula again.

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