Found 3 places
Latitude: 41.8884 (41°53′18″N), Longitude: -87.6064 (87°36′23″W)
Site: lrc.usace.army.mil/co-o/Chi_Lock_02.htm
Latitude: 41.855 (41°51′18″N), Longitude: -87.608 (87°36′29″W)
Latitude: 41.6518 (41°39′7″N), Longitude: -87.5669 (87°34′1″W)