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Construction workers stand among large pieces of rock while excavating for the Chicago Sanitation and Ship Canal.

Construction workers attach cables and load containers full of excavated earth during the construction of the Chicago Sanitary and Ship Canal.

Several cranes used to hoist excavated earth stand on both sides of the Chicago Sanitary and Ship Canal construction site.

Workers stand next to several debris containers as a crane lifts the containers during the construction of the Chicago Sanitary and Ship Canal.

Cranes hoist excavated earth during the construction of the Chicago Sanitary and Ship Canal.

Construction workers use large equipment to load containers with debris during the construction of the Chicago Sanitary and Ship Canal.

Construction workers load containers full of excavated earth during the construction of the Chicago Sanitary and Ship Canal.

A crane fixed on tracks hoists material during the construction of the Chicago Sanitary and Ship Canal.

Construction containers travel on wires between several derricks over the Chicago Sanitary and Ship Canal construction site.

Construction workers attach cables and load containers full of excavated earth during the construction of the Chicago Sanitary and Ship Canal.

Several smokestacks emit smoke on either side of the Chicago Sanitary and Ship Canal construction site.

A large piece of construction equipment excavates earth and rock during the construction of the Chicago Sanitation and Ship Canal.

Several men stand around and on top of a large piece of digging equipment during the construction of the Chicago Sanitary and Ship Canal.

Construction workers labor among several large pieces of equipment on the bed of the Chicago Sanitary and Ship Canal.

Construction workers attach cables and load containers full of excavated earth during the construction of the Chicago Sanitary and Ship Canal.

Several workers load debris containers while a steam shovel digs nearby.

Containers moving on wires between derricks travel over workers laboring in a debris field during construction of the Chicago Sanitary and Ship Canal.

A container moves on a wire between two derricks. An inset photograph shows the container dumping excavated material while suspended mid-air.

An aerial view taken from atop a cantilever conveyor crane during the construction of the Chicago Sanitary and Ship Canal shows the construction site and surrounding land.

A large cantilever conveyor crane stands on top of a wall while moving earth excavated during the construction of the Chicago Sanitary and Ship Canal.

A large cantilever conveyor crane, drops 1.75 tons of rock excavated during the construction of the Chicago Sanitary and Ship Canal onto a pile.

Two men stand on the walkway on the top of the Bear Trap Dam.

A view from the top of the Bear Trap Dam shows water pouring on of the side of the dam nearly nine months after water was released from Lake Michigan into the Chicago Sanitary and Ship Canal.

An aerial view shows the top of the Bear Trap Dam and the surrounding waterways nearly nine months after water was released from Lake Michigan into the Chicago Sanitary and Ship Canal.

A man looks on from the Bear Trap Dam nearly nine months after water was released from Lake Michigan into the Chicago Sanitary and Ship Canal.