(Windmill, IA-07-35) NE of Waterloo, Bennington Township, Black Hawk County, IA. Big Rock Rd. E. 3.9 miles from jct with US63 N. of Waterloo to the quilt on the N. side of the road at 3845. Joe & Teresa Bartholomew. (N42 33.389 W92 15.620) Photos by Jack & June Schmidt 6-30-12.