A short but steep drop funnels into a deep wave hole in the river center. The hole is big violent enough to flip rafts and cartwheel kayaks. At some flows it is a wild play spot. Upside down boaters usually flush very quickly and it does not hold swimmers. However, it can be very shallow and kayakers have hit their heads or paddles on the bottom when they get flipped. Swimmers coming into the rapid from above could fare worse.
Conservative boaters sneak the hole on either side. Those seeking to provide carnage entertainment charge the middle.