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This reinforced concrete dam, built with its concave side downstream, impounds a 50-million-gallon reservoir for the depot. The dam is 120 feet high and approximately 180 feet wide and has a thickness of 6 feet at the top and 24 feet at the base. It is one of four dams built in the 1930s to supply the depot with water and one of six dams in the area built for the depot.