posted on Aug, 16 2012 @ 03:33 PM
Taken from The Ice Age Flood Institute, Web Site:
"During the most recent episode of major ice-sheet expansion, between about 18,000 and 13,000 years ago, a lobe of the Cordilleran ice sheet advanced
into the Idaho Panhandle to the area that is now occupied by Lake Pend Oreille, thus blocking the Clark Fork River drainage and causing Glacial Lake
Missoula to form. At its largest, the lake was deeper than 2,000 feet deep at the dam and held over 500 cubic miles of water—as much as Lake Erie
and Lake Ontario combined. The ice dam, however, was subject to repeated failure.
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. The
peak rate of flow was ten times the combined flow of all the rivers of the world. The huge lake may have emptied in as little as two or three days.
Over a period of years the glacier would advance, once again blocking the river, and the dam and the lake would form again. This process was repeated
scores of times, until the ice sheet ceased its advance and receded to the north at the end of the Ice Age. It is assumed that the same processes
would have occurred earlier during other glacial advances throughout the Ice Age, although most of the evidence for the earlier events may have been
removed by the flooding that occurred during the last glacial advance".
This would totaly wipe out anything in its path. I also think similar floods happened on the North American east coast.