(Snails Trail, IA-13-01) W. of Rockwell City, Twin Lakes Township, Calhoun County, IA. US20 W. 1.8 miles from jct with IA4 W. of Rockwell City to the quilt on the N. side of the road at 2215. Phillip Noel & Heather Maulsby. (N42 23.956 W94 41.127) Photos by Jack & June Schmidt 7-15-12.