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Construction workers stand in and along the Chicago Sanitary and Ship Canal as a large cantilever conveyor crane moves excavated earth.

Several shuttle cars haul materials to and from workers during the construction of the Chicago Sanitary and Ship Canal.

A landscape view shows progress on the stone and metal pylons making up a portion of the Bear Trap Dam.

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

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

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

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

Construction materials lie near a waterway in an unidentfied town.

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

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

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

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

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

Building materials surround an opening to a structure under construction.

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

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

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…

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.

Workers attempt to clear an area during the early phases of 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.

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 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.

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.

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.

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