(Jacobs Ladder, IA-07-36) NE of Waterloo, Bennington Township, Black Hawk County, IA. Big Rock Rd. E. 4.4 miles from jct with US63 N. of Waterloo to the quilt on the N. side of the road at 4405. Raymond & Darlene Hoffman. (N42 33.377 W92 15.017) Photos by Jack & June Schmidt 6-30-12.