(Large Cellhouse, 1919, IL-99-19 & 20) at Stateville prison N. of Joliet, Lockport Township, Will County, IL. IL7/53 N. 1.9 miles from jct with IL7 & IL53 in Joliet to the prison on the W. side of the road. (N41 34.726 W88 05.587) Photo 10-13-02.