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

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

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

A side view shows the Bear Trap Dam seven days after water was released from Lake Michigan into 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 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.

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

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

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

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.

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."

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

Smoke billows from smokestacks on dredging equipment during the construction of the Chicago Sanitary and Ship Canal.

A man stands on a pipe and surveys the area during the construction of the Chicago Sanitary and Ship Canal.

A blueprint created by Lindon W. Bates shows details of a hydraulic dredge used during the construction of the Chicago Sanitary and Ship Canal.

An Illinois Dredging Company ship outfitted with dredging equipment sits in the middle of an unidentified waterway.

Dredging equipment fixed on Illinois Dredging Company ships stands in the business's docks.

Smokestacks emit smoke around the docks of the Illinois Dredging Company.

A wide view shows a canal located near the Illinois Dredging Company office, including a barge, a small ship, and additional equipment used during the construction of the Chicago Sanitary and Ship Canal.

United States Navy Admiral George Dewey and his party exit Windage Basin on the Chicago Sanitary and Ship Canal at Lockport. Photo caption: "1639-15 5-2-1900. Admiral Dewey and party leaving Lockport. Photo taken during thunder storm."

The flagship "Hinda," carrying United States Navy Admiral George Dewey, enters Windage Basin on the Chicago Sanitary and Ship Canal at Lockport.

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.

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.

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