43rd Street Jump (Roller/Dam): 2.5 sq.mi.

Immediately under the downstream edge of 43rd Street lies a rounded cement slab ('hydraulic jump'). With high flows this is likely to form a very uniform hydraulic. However, with only 2.5 square miles drainage, it will seldom get high flows, and they won't last very long.

Upstream of this point, the heavily wooded area is extremely prone to deadfall and snags, so putting in above this location is extremely unlikely by anyone who has bothered to read this description or to look at the actual river!