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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

Return to the Ice Age Floods Features page

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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