The great continental ice sheets were melting very fast in the time of Glacial Lake Missoula, shedding great torrents of meltwater every summer, raising sea level an average of approximately 100 ...

Scabland Coulee The floods left behind "coulees ... Dry Falls This lake is one of a number of plunge pools left behind when Glacial Lake Missoula's debris-clogged waters rushed over the rocky ...