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

Cranes lift construction materials next to the Bear Creek Dam spillway construction site.

Construction workers labor on the Bear Trap Dam spillway.

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

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 side view shows the incomplete floodgates of the Bear Trap Dam during construction.

A landscape view shows the length of the Bear Trap Dam during the winter.

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

Workers construct an additional structure atop the Bear Trap Dam more than ten months after water was released from Lake Michigan into the Chicago Sanitary and Ship Canal.

Men stand on top of 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 construction taking place on the Bear Trap Dam at the base of the Chicago Sanitary and Ship Canal.

A view taken from the top of the construction at the Bear Trap Dam shows a portion of the dam with a large wheel on top.

Workers and engineers examine the progress of the construction of the Bear Trap Dam at the base of the Chicago Sanitary and Ship Canal.

Construction workers labor on top of a portion of the Bear Trap Dam located at the base of the Chicago Sanitary and Ship Canal at Lockport.

Several cranes stand on top of the Bear Trap Dam during construction.

Construction materials fill the Bear Trap Dam construction site at the base of the Chicago Sanitary and Ship Canal.

Several large rocks and pieces of construction equipment stand on top of the Bear Trap Dam construction site.

Construction workers stand among building equipment and materials during construction of the Bear Trap Dam.

Construction materials and equipment lie on the top of the Bear Trap Dam.

An engineer examines the progress of the construction of the Bear Trap Dam at the base of the Chicago Sanitary and Ship Canal at Lockport.

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

Construction materials lie on top of the Bear Trap Dam located at the base of the Chicago Sanitary and Ship Canal at Lockport.