That happened where we live also. About 400,000 years ago there was a giant lake here in southern Colorado. To our south about 30 miles is a line of volcanoes that were the dam for the lake. The water broke through and the lake drained scouring a canyon into northern New Mexico. The present day Rio Grande flows through the canyon now and in that section there are class 4 and 5 rapids. We could sure use some of that water today.
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