(Double Aster, IA-92-09) W. of Riverside, Iowa Township, Washington County, IA. IA22 W. 2.1 miles from jct with Riverside Rd. in Riverside to the quilt on the S. side of the road at 2690. Ed Shebek. (N41 29.029 W91 37.207) Photos by Jack & June Schmidt 6-17-12.