heibeck.net - Galleries

Wallula Gap is a major formation left over from the ice age Missoula floods. You ascend a bluff to 400 feet above the Columbia River. Usually you'd expect the top of such a buff to be flat or starkly contoured, but is not the case. Bare rock faces, hanging coulees, mesa and other formations I don't know the names of are present. It's easy to see how rushing water on top of the of the mesa could have caused the formations.