Kreepers about 18,000 years ago a lobe of Cordillera ice sheet advanced into the Idaho panhandle to the area which is now occupied by lake pend, this blocking the river drainage causing glacial lake Missoula to form. When the dam broke a towering mass of water and ice was released and swept across parts of Idaho Washington, and oregon on its way to the ocean. This happened over an over for many years until the ice sheet ceased its advance and receded to the north at the end of the ice age..
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