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

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

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

Several men stand on "The John Tarn" which was used for dredging during the construction of the Chicago Sanitary and Ship Canal.

The John Tarn, a piece of dredging equipment, sits in the middle of a waterway during the construction of the Chicago Sanitary and Ship Canal.

Construction workers clear material around a conveyor system that is part of a large cantilever conveyor crane, which is being used to move earth excavated during the construction of the Chicago Sanitary and Ship Canal.

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.

A close up view shows a large cantilever conveyor crane used to move earth excavated during the construction of the Chicago Sanitary and Ship Canal.

A large cantilever conveyor crane spans the Chicago Sanitary and Ship Canal and moves earth excavated during construction.

Workers attempt to clear an area during the early phases of construction of the Chicago Sanitary and Ship Canal.

A worker stands near a large hole in the side of the Chicago Sanitary and Ship Canal which was the result of a dynamite blast while other workers labor at a location nearby.

Chief engineer of the Sanitary District, George Wisner (left), president of the Great Lakes Dredge and Dock Co., William Lydon (middle), and a third unidentified gentleman, pose for a group photo in downtown Chicago atop the large dipper of a…

Construction workers labor on a large structure along a waterway in an unidentified town.

Workers continue construction of the Chicago Sanitary and Ship Canal near downtown Chicago.

Building materials surround an opening to a structure under construction.

Workers load shuttle cars with material during the early phases of construction of the Chicago Sanitary and Ship Canal.

Construction materials lie at a worksite on the Chicago Sanitary and Ship Canal neaxt to a truss bridge.

Water fills a portion of the Chicago Sanitary and Ship Canal as workers labor under a truss bridge.

Construction workers labor on the Chicago Sanitary and Ship Canal behind a truss bridge.

Large piles of rock stand under the Santa Fe Railway Bridge at Lemont during the construction of the Chicago Sanitary and Ship Canal.

Construction materials lie near a waterway in an unidentfied town.

An internal view shows wooden support beams underneath an unidentified structure.

Two men stand on a structure near the right bank of an unidentified waterway in an unidentified town.

A landscape view shows several buildings along the banks of an unidentified waterway used during the construction of the Chicago Sanitary and Ship Canal.

Three workers stand on top of one of several stone and metal pylons under construction at Bear Trap Dam.