Concrete caisson being sunk for tunnel construction shaft, Waterworks Park, Detroit water supply system
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Description
View of concrete caisson being sunk for tunnel construction shaft, Waterworks Park, Detroit water supply system. Workers in background. Printed on front: "City of Detroit. Department of Water Supply. Land tunnel and structures. Contract RC 12. Dravo Contracting Co., contractors. Photo no. 35. Date: 9-22-30. Photo by Manning Brothers." Typed on back: "Rectangular concrete caisson being sunk for construction shaft for 15'-6" tunnel."