(Fenton / PWSD #3) in Fenton, Rock Township, Jefferson County, MO. Old Hwy 141 S. 1.7 miles from jct with Gravois Rd. in Fenton, W. (right) on Brethold Rd. 0.1 miles to the tower. (N38 29.554 W90 26.606) Photos by Jack Schmidt 4-12-09.