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[ New Search ] Atop the O'Shaughnessy Dam Location : Hetch Hetchy, CA Agency : PWA Owner : NARA (SPB) Medium : B&W Photo Control Number : P-84 Enlarged Image Description : A visitor inspects a plaque on the O'Shaughnessy Dam, part of the San Francisco water supply system. Listed Under: [Utilities][Waterworks][San Francisco Waterworks] [Utilities][Dams]