Timbering of south heading of tunnel during construction, Waterworks Park, Detroit water supply system
Description:
View of timbering of south heading of tunnel during construction, Waterworks Park, Detroit water supply system. Printed on front: "City of Detroit. Department of Water Supply. Land tunnel and structures. Contract RC 12. Dravo Contracting Co., contractors. Photo no. 93. Date: 3-31-31. Photo by Manning Brothers." Typed on back: "14 ft. tunnel, south heading. View of timbering in last 18 ft. of tunnel at screen chamber. Note square timber sets which supported pilot drift and in background the steel sheet piling driven to support quarter bend excavation. Sheet piling is to be burned off at outside of concrete lining."
