It takes 2 hands

Climb the Off width. A variety of technique's can be used. Stacking? check. Armbars? check? Either way the difficulty is the same. In the middle of the route there is a slight constriction that represents the crux.

Mid way up the canyon on the left hand wall(going upstream). It's an obvious OW splitter and hard to miss.

This is a Deep water solo. If you fall be aware of the shallow water to the left.