The last ice damn that held Lake Missoula was right there about 10,000 or so years ago though there were many other older ice dams. The ice dam burst sending a monster flood down eastern Washington through what is now known as the scablands and down the Columbia gorge. The great soil in the Willamette valley was deposited during these floods.
-- Post From My iPhone
Location:Trout Creek, MT
Or it was formed by Noah's flood!
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