View of back channel for the Detroit water supply system. Crane in background. Printed on front: "City of Detroit. Department of Water Supply. Intake system for additional supply. Intake lagoon. Contract RC-9. Dunbar & Sullivan Dredging Co., contractors. Photo no. 49. Date: 11-10-30. Photo by Manning Brothers." Typed on back: "Widening the westerly 1400 feet of back channel. Looking downstream."
