Halls (Stockwell) Creek - Trow Lake Dam (Merrillan) to Black River confluence (11.5 or 6.3 miles) (WI)
Approximate - nearest available gauge. Use as general reference only.
Our listed put-in at the base of Trow Lake Dam is right at the 880' contour line on Topo Maps. At mile 9.94 you cross the 780' contour line, making an average gradient of ~10 FPM.