Little Falls

From gorp.away.com:

Below the twin dams the river narrows rapidly and drops over one long rock garden and several wave trains before reaching Little Falls proper. This rapid is a straightforward ledge at the lowest levels but even the slightest change in water height can alter Little Falls into a thundering, boiling monster. At high levels the normally short Class III drop stretches into a Class VI killer with 15-foot exploding waves stretching for half a mile. No detailed explanation of Little Falls is attempted here since it is essential to only attempt this stretch in the company of paddlers who have experience with this rapids and to scout it from the left bank of the river. It is interesting to note that the highest water velocity ever recorded in nature was seen at Little Falls during the massive flood of 1936.