Frenchman Coulee - Glacial Lake Missoula Flood Features on Waymarking.com

Frenchman Coulee is a dual coulee and cataract system. Scabland floods created Frenchman Coulee when they spilled westward over a low divide across Evergreen Ridge, out of the southwest corner of the Quincy Basin. During initial stages of flooding, the difference in water levels between the flood-filled Quincy Basin and the Columbia River immediately west of Evergreen Ridge approached 700 feet over just a few miles. This incredible difference in water levels caused floodwaters to relentlessly eat away the underlying rock layers. Erosion continued for at least as long as it took for the water level in the Columbia Valley to rise to about 1200 feet, or until the floodwater supply was exhausted.

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Date Logged Log User Rating   08/15/2022 The A-Team visited it 10/09/2011 Cool Cow Cachers visited it 07/17/2011 PYNEKONE visited it 09/23/2009 Volcanoguy visited it

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