The Geddes Dam is a decommissioned hydroelectric barrage dam crossing the Huron River. It is located in Ann Arbor Township in Washtenaw County in the U.S. state of Michigan. It was built by the Detroit Edison Company in 1919 for hydroelectricity before being decommissioned in 1959. The dam is currently owned by the nearby city of Ann Arbor. The surrounding area is used for recreational purposes, including Gallup Park, which is Ann Arbor's most popular recreational area.