At Upper Mesa Falls, a thunderous curtain of water – as tall as a 10-story building – pours over remnants of an ancient volcanic super-eruption that spewed ash over much of the current US. A mile south, Lower Mesa Falls repeats the performance; the river continually chiseling away at the solidified ash and lava. Some layers are more than a million years old. Today, Upper and Lower Mesa Falls are the last prominent waterfalls on the Snake River to resist human control.
September 30th, 2014
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