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Palouse Falls, Palouse Falls State Park. The Canyon At The Falls Is 115 Meters (377 Feet) Deep, Exposing A Large Cross-Section Of The Columbia River Basalt Group. These Falls And The Canyon Downstream Are An Important Feature Of The Channeled Scablands Created By The Great Missoula Floods That Swept Periodically Across Eastern Washington And Across The Columbia River Plateau During The Pleistocene Epoch. The Ancestral Palouse River Flowe