(Indian Trails, IA-81-94) W. of Sac City, Boyer Valley Township, Sac County, IA. US20 W. 4.9 miles from jct with 16th St. in Sac City to the quilt on the S. side of the road at 2444. Joe Haley. (N42 25.306 W95 05.963) Photos by Jack & June Schmidt 7-18-12.