8/12/2023 0 Comments Base flood elevation corvallis![]() īetween 80,000 years ago and 10,000 years ago ice sheets called the "Wisconsin Glaciation" covered much of North America, including Northern Washington, Idaho, and Montana. Glacial Lake Missoula and the Missoula Floods. The waters of the Missoula Floods poured through the Wallula Gap thousands of years ago. Wallula Gap, as seen from Juniper Canyon, Oregon.
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