The crossing you are looking at here isn't even the tough one.  The tough one we call simply "the 3rd crossing" because it is the 3rd of 5 between Kyles and Hemmed-In.  The water is fast, the bottom is slick bedrock and large stones, and there is a deep pool upstream and a deep pool downstream.

To make matters worse, this day the waste deep rapids measured in at a comfortable 50 degrees!  But we made it across with Jonathan and I holding a guide rope while the group crossed.

The Ponca low water bridge measured 19" of air space.  (The USGS gage at Boxley rated 3.3 ft)