(Pilot Knob Rural Water) N. of Pilot Knob, Iron Township, St. Francois County, MO. MO21 N. 2.3 miles from jct with Maple St. on the W. side of Pilot Knob, continue N. on SR W 1.8 miles to the tower on the E. side of the road. (N37 40.207 W90 38.768) Photos by Jack & June Schmidt 12-1-12.