(Gold Rush, IA-12-25) N. of Clarksville, Butler Township, Butler County, IA. Main St. (IA188) N. 0.7 miles from jct with Superior St. in Clarksville to the quilt on the W. side of the road at 17535. Ron & Betty Miller. (N42 47.720 W92 40.100) Photos by Jack & June Schmidt 7-7-12.