When the Ice Age was ending, a giant mass of ice (two thousand feet high) broke off and blocked the flow of the Clark Fork river of northwestern Montana, which caused all that meltwater upstream to form a huge lake extending 200 miles to the northeast with a volume of water equivalent to the combined volumes of Lakes Erie and Ontario, all that water suddenly released when “lake Missoula” broke through the ice dam in a prodigious flow, scouring eastern Washington, now called the Scablands, the equivalent of Lakes Erie and Ontario rapidly flowing through, what a sight that would have been to see!
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