I had no idea that there was an Ice Age Floods National Geologic Trail.  Apparently it starts in Montana and travels through Idaho, Washington, Oregon until it finally reaches the Pacific Ocean.  this geological trail starts with an ice dam that created a lake of about 3,000 square miles.  That's a big lake.  As expected, an ice dam won't last and eventually failed which allowed all that water to course through Idaho and into Washington.  Here you can see where the water ran over the sides of the canyon wall creating a waterfall larger and wider than Niagara Falls.  Having visited last year and being at the bottom, thinking that was impressive I could use my imagination for this.  Still the scope of it is too big.  The waters carved out the Coulee Corridor. Now this area is dotted with spring fed lakes that make it a beautiful destination for fishing, camping and hiking.