Wow. That's another beautiful example of "The Dynamic Earth."
Thanks for posting that Logan. I did a spring trip years ago and Little D had flashed sometime in the previous month or so, leaving a scour line about 10 feet vertically above the bottom of the creek. I did a back of the envelope calculation and came up with a discharge of about 3,000 - 5,000 cfs during the flash flood. Here's a snapshot of the Little D drainage looking downstream
, the guys in white shirts are standing on the scour line.