(Hogback, 106', 1884, closed to motor traffic, 15-61-04) across North River NNW of Winterset, Douglass Township, Madison County, IA. US169 N. 3.8 miles from jct with IA92 on the N. side of Winterset, W. on N River School Rd. 2.3 miles, S. on Hogback Bridge Rd. 1.0 miles to the bridge on the W. side of the road. (6-6-01, N41° 23.196', W94° 02.857')