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Moses Coulee hanging valleys

View on map:47.364852°N 119.937104°W

Comments

The small valleys in the mountains primarily to the east once fed a small river in the region. But the floods in the coulee eroded the valley much deeper and wider and now the small stream valleys in the mountains run into steep cliffs.

Description


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 events have been researched since the 1920s. These 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 rupture, the ice would reform, creating Glacial Lake Missoula again.

References

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