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

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.

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

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

Construction workers work on the bed of the Chicago Sanitary and Ship Canal.

A worker stands in front of the partially completed floodgates at the Bear Trap Dam.

Trustees of the Sanitary District of Chicago pose for a picture as construction on the Bear Trap Dam nears completion.

Workers stand on and next to Bear Trap Dam during construction.

Construction workers lay bricks around segments of the Bear Trap Dam.

A man walks across the Bear Trap Dam as water flows through it.

Construction debris stands on the edge of the Bear Trap Dam.Photo caption: "1580-15 1-16-1900; Bear Trap Dam Elev. +5.0"

Trustees of the Sanitary District of Chicago stand at the foot of the Bear Trap Dam two days before the first water from the Chicago Sanitary and Ship Canal would be released into the Des Plaines River.

The first water from the Chicago Sanitary and Ship Canal trickles over the crest of the Bear Trap Dam into the Des Plaines River.

A view shows the rapids passing over the Bear Trap Dam where 255,000 cubic feet of water passes every minute.

Rapids pass over the Bear Trap Dam located at Lockport, at a rate of 255,000 cubic feet per minute.

A side view shows the rapids passing over the Bear Trap Dam located at Lockport.

An aerial view shows the Bear Trap Dam in operation. Photo caption: "1586-15 1-20-1900 Bear Trap Dam in operation. Depth of water at crest of Dam 2 ft."

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