(Dutchmans Puzzle, IA-92-04) NNE of Washington, Jackson Township, Washington County, IA. 12th Av. (becomes Riverside Rd.) N. 2.7 miles from jct with IA92 (Washington St.) in Washington, E. on 220th St. 0.5 miles, N. on Riverside Rd. 6.1 miles to the quilt on the W. side of the road at 1765. Dingbaum. (N41 24.003 W91 37.171) Photos by Jack & June Schmidt 6-17-12.