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Large stone tablets lie in groups near brick and stone structures under construction at Bear Trap Dam.

Workers begin to lay stone around metal pylons during construction at Bear Trap Dam.

Large stone blocks form a stair-like end to a retaining wall under construction.

Construction workers labor near a large pile of rock along the Chicago Sanitary and Ship Canal.

Construction workers break up rock along the side of the Chicago Sanitary and Ship Canal.

A large pile of broken rock stands at the end of the Chicago Sanitary and Ship Canal construction site.

Workers add large stone blocks to a retaining wall along the Chicago Sanitary and Ship Canal.

A wide view of the Chicago Sanitary and Ship Canal shows the progression of construction on the retaining wall.

A landscape view shows construction taking place on the Chicago Sanitary and Ship Canal.

Construction workers use a crane to lift and place large stone blocks in a retaining wall.

Workers load rocks into carts on railroad tracks for transport during construction at the Chicago Sanitary and Ship Canal.

An aerial view shows a dynamite blast during the construction of the Chicago Sanitary and Ship Canal.

A 1050 pound dynamite blast explodes during the construction of the Chicago Sanitary and Ship Canal.

A 500 pound dynamite blast goes off during the construction of the Chicago Sanitary and Ship Canal.

A cantilever conveyor crane dumps 1.75 tons of rock onto a large pile during the construction of the Chicago Sanitary and Ship Canal.

Three cantilever conveyor cranes stand above a construction site on the Chicago Sanitary and Ship Canal.

Two cantilever conveyor cranes on the stand on the side of the Chicago Sanitary and Ship Canal as construction workers fill containers with debris.

Two horses and a man stand near a conveyor system with railroad cars and tracks used to move excavated earth during the construction of the Chicago Sanitary and Ship Canal.

Several large pieces of construction equipment fill the Chicago Sanitary and Ship Canal during construction.

Cranes stand behind the first retaining wall build on the Chicago Sanitary and Ship Canal.

Construction workers stand among large pieces of rock while excavating for the Chicago Sanitation and Ship Canal.

Construction workers attach cables and load containers full of excavated earth during the construction of the Chicago Sanitary and Ship Canal.

Several cranes used to hoist excavated earth stand on both sides of the Chicago Sanitary and Ship Canal construction site.

Workers stand next to several debris containers as a crane lifts the containers during the construction of the Chicago Sanitary and Ship Canal.

Cranes hoist excavated earth during the construction of the Chicago Sanitary and Ship Canal.