March 2019
Volume 71    Issue 3

World’s largest tunnel gates and reservoir connection go online as part of Chicago’s Tunnel and Reservoir Plan

Mining Engineering , 2019, Vol. 71, No. 3, pp. 90-90
Sanchez, Miguel; Oksuz, Faruk; Schiemann, Dave; Jensen, Patrick


The McCook Main Tunnel connects Chicago’s Tunnel and Reservoir Plan (TARP) Mainstream Tunnel to the McCook Reservoir. The tunnel system consists of a 10 m (33 ft) finished diameter and 490-m (1,600-ft) long hard-rock tunnel constructed from a 27.5-m (90-ft) diameter and 92 m (300 ft) deep main gate shaft. The gate shaft houses six high-head 4.4 by 9 m (14.5 by 29.5 ft) wheel gates installed in the bifurcated and steel-lined section of the tunnel. The tunnel also includes portal and energy dissipation structures as it daylights into the reservoir. 

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