Building the Canal to Save Chicago

Chapter 5 Photos, 1–23

(photos 24–45 here)

Rock Section

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Lake Claremont Press

Lake Claremont Press: A Chicago Joint

S. Woodhouse Books

BC-Photo 5.11

A double cantilever inclined truss is used in Section 12 for rock removal from the excavation of the Main Channel, 1895. The Truss support was mounted on rails for travel alongside the Main Channel. Hoppers were hoisted from the floor of the Main Channel, moved by a trolley up the slope of the inclined truss, and dumped on the spoil pile. In the foreground are gaps in the rock wall where the structural rock quality was poor or weak. (MWRD photo, Geiger set, image 338)