(Spring Beauty, IA-81-05) W. of Sac City, Jackson Township, Sac County, IA. US20 W. 3.9 miles from jct with 16th St. in Sac City to the quilt on the S. side of the road at 2566. Irwin Farm. (N42 25.285 W95 04.724) Photos by Jack & June Schmidt 7-16-12.