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

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

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

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.

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

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

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 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 close up view shows the engineering included in the Bear Trap Dam including two large pieces of wheel-based machinery.

A man poses for a picture under a large cylinder built into the wall of the Bear Trap Dam at the base of the Chicago Sanitary and Ship Canal at Lockport.

A man sits on a large concrete pillar in front of the Bear Trap Dam located at the base of the Chicago Sanitary and Ship Canal at Lockport.

A side view shows the Bear Trap Dam more than seven months after water was released from Lake Michigan into the Chicago Sanitary and Ship Canal.

A landscape view shows the snowy Bear Trap Dam and Chicago Sanitary and Ship Canal during construction.

A landscape view shows the Bear Trap Dam surrounded by water more than ten months after water was released from Lake Michigan into the Chicago Sanitary and Ship Canal.

A side view of the Bear Trap Dam shows water releasing from the Chicago Sanitary and Ship Canal into the Des Plaines River.

A landscape view shows vegetation growing around the Bear Trap Dam on 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.

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 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.

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

A view of the Bear Trap Dam shows a floodgate.

A man and a woman pose for a picture at the bottom of the Bear Trap dam located at the base of the Chicago Sanitary and Ship Canal at Lockport.

A view of the Bear Trap Dam, located at the base of the Chicago Sanitary and Ship Canal at Lockport, shows a closed floodgate on the dam.

Trustees of the Sanitary District of Chicago pose for a group photo at the base of the Chicago Sanitary and Ship Canal at Lockport. The Bear Trap Dam is visible in the background on the left.

Trustees of the Sanitary District of Chicago pose for a group photo atop the Bear Trap Dam located at the base of the Chicago Sanitary and Ship Canal at Lockport.