This fast rapid guards the entrance to First Canyon. 17 Ender is a steep ledge immediately following a sharp bend to the left. A boater who wasn't heads-up could get pulled into this one before they realize what's happening. 17 Ender can be run down the gut, but for nervous kayakers or packrafters an easier line exists on the left at most levels. Immediately downstream, the river enters an impressive box canyon and squeezes through a constriction sometimes called Predator which features lateral waves and holes. I usually think of this sequence as one rapid and it could be class IV at higher water levels. Note: A trail comes down to the river on the left directly above this rapid. Kayaks and packrafts often put-in here for a direct launch into the whitewater.