Ahead of you, some 3,000 feet in the distance are a series of prominent ridges that are just a few of the hundreds of Giant Ripples of Camas Prairie.  The ripples, some of which are thousands of feet long and up to 45 feet high, were created 15,000 years ago when the last ice age neared its end in North America.  Interestingly, in this exact spot close to that time, you would be standing beneath a thousand feet of frigid water of Glacial Lake Missoula, formed when an enormous lobe of glacial ice blocked the Clark Fork River in northern Idaho.  The lake that formed behind the ice dam expanded until it was about half the size of Lake Ontario.  The ice dam eventually collapsed and Glacial Lake Missoula emptied catastrophically to the west, its waters roaring to the Pacific Ocean.