(Langworthy-Chalmers, 48', 1857, IA-31-02) in Dubuque, Dubuque County, IA. US20 W. 1.0 miles from jct with US61, N. on Alpine St. 0.3 miles to the house on the E. side of the road at 1095. (N42 29.728 W90 40.752) Photo 6-10-01.