A close up view shows the conveyor system on a large cantilever conveyor crane used to move earth excavated during the construction of the Chicago Sanitary and Ship Canal.
Trustees of the Sanitary District of Chicago stand at the foot of the Bear Trap Dam two days before the first water from the Chicago Sanitary and Ship Canal would be released into the Des Plaines River.
An aerial view shows the Bear Trap Dam in operation. Photo caption: "1586-15 1-20-1900 Bear Trap Dam in operation. Depth of water at crest of Dam 2 ft."