(14-sided, IA-17-04) in Rockwell, Cerro Gordo County, IA. Madison St. E. 0.5 miles from jct with US65 in Rockwell, S. on 1st St. 0.35 miles, E. on Ella Ct. 200’ to the house ahead at 16. (N42 58.503 W93 11.472) Photo 6-19-02.