Can you imagine these falls during the Ice Age Missoula Floods? Water was rushing over the top flat rim of the plateau at 70 miles per hour! The existing falls is but a small trickle of what was.
The amazing geological history of Eastern Washington continues to fascinate me. The current falls are 187 feet tall. The Ice Age Flood falls were about twice in height. Basalt on the canyon walls was created by a series of lava flows between 15 & 18 million years ago. The Missoula Floods creating the canyon occurred 12 to 15 thousand years ago (just a spec of time in our geologic history).