The Flow over Bear Trap Dam, Chicago Drainage Canal, Lockport, Ill's., "G 4800" on negative., Detroit Publishing Co. no. 071025., Gift; State Historical Society of Colorado; 1949, Bridges. , Dams. , Canals. , United States, Illinois, Lockport. , United States, Illinois, Sanitary and Ship Canal.

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Keywords: ., bridges., canals., dams., states--illinois--lockport, united