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Plunge Pools - Scoured Out by the Ice Age Floods


Potholes Coulee and Dusty Lake. Ice Age Floods plunge pool.
Dusty Lake fills a plunge pool created by the Ice Age Floods in Potholes Coulee.

plunge pool: a deep, circular hole eroded at the base of a cataract, scoured out by the force of up to hundreds of feet of floodwater tumbling over the cataract. (Bjornstad)

Palouse Falls spills into a massive Ice Age Floods carved plunge pool.

In his book "Glacial Lake Missoula and Its Humongous Floods", David Alt describes this plunge pool as "ridiculously oversized".

Dry Falls Lake

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The formation of plunge pools is described in Bruce Bjornstad's book, On the Trail of the Ice Age Floods.


All photos by Tom Foster unless otherwise noted.

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