(42', 1987, IA-52-16) N. of Iowa City, Newport Township, Johnson County, IA. Prairie Du Chien Rd. N. 2.5 miles from jct with IA1 (Dodge St.) on the N. side of Iowa City to the house on the E. side of the road at 4272. (N41 42.572 W91 30.917) Photo by Jack & June Schmidt 6-18-12.