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Construction workers use large pieces of machinery during the early phases of construction on the Chicago Sanitary and Ship Canal.

Construction workers use large pieces of construction equipment to work on a roadway.

A large cantilever conveyor crane removes excavated earth from the Chicago Sanitary and Ship Canal.

Construction workers labor in the bed of the Chicago Sanitary and Ship Canal.

A machine loads excavated earth onto a railroad car during the construction of the Chicago Sanitary and Ship Canal.

Men stand next to a large conveyor system used to move shuttle cars full of earth excavated during the construction of the Chicago Sanitary and Ship Canal.

A shuttle car filled with excavated earth travels to the top of a large conveyor system while an empty car stands at the bottom during the construction of the Chicago Sanitary and Ship Canal.

Several empty shuttle cars sit at the bottom of a large conveyor system used to move earth excavated during the construction of the Chicago Sanitary and Ship Canal.

Construction workers build a wall.

Two large cantilever conveyor cranes remove excavated earth from the empty Chicago Sanitary and Ship Canal.

Workers rig dynamite to blast a section of rocky earth during the construction of the Chicago Sanitary and Ship Canal.

4450 pounds of dynamite sits in boxes in preparation for use blasting sections of the Chicago Sanitary and Ship Canal during construction. Photo caption: "1376 6-28-99 Danger!! 4,450lbs. Dynamite."

Construction workers stand among rubble after a dynamite blast successfully broke up a section of the rocky earth during the construction of the Chicago Sanitary and Ship Canal.

Workers remove sections of broken-up rocks during the construction of the Chicago Sanitary and Ship Canal.

Construction on the Chicago Sanitary and Ship Canal continues during the winter.

Three men stand and survey the progress of the construction of the Chicago Sanitary and Ship Canal.

Several workers stand at the base of a large conveyor system used to move shuttle cars full of earth excavated during the construction of the Chicago Sanitary and Ship Canal.

A large conveyor system used to move shuttle cars full of earth excavated during the construction of the Chicago Sanitary and Ship Canal stands above a large pile of rubble.

Several pieces of construction equipment work on the construction of the Bear Trap Dam at the base of the Chicago Sanitary and Ship Canal.

Construction nears completion on the Bear Trap Dam at the base of the Chicago Sanitary and Ship Canal at Lockport.

Construction workers attempt to repair a water break from inside a paved road.

Railroad tracks run through the construction site at the Chicago Sanitary and Ship Canal.

Construction materials lie on top of the Bear Trap Dam located at the base of the Chicago Sanitary and Ship Canal at Lockport.

An interior view shows the construction of the Bear Trap Dam located at the base of the Chicago Sanitary and Ship Canal at Lockport.

An engineer examines the progress of the construction of the Bear Trap Dam at the base of the Chicago Sanitary and Ship Canal at Lockport.