Geddes Dam is a decommissioned hydroelectric barrage on the Huron River. Built in 1919 by Detroit Edison, it was taken out of hydro service in 1959, rebuilt after a 1968 failure, and remains in place as part of a recreational landscape around Gallup Park and the Border-to-Border Trail. ([en.wikipedia.org](https://en.wikipedia.org/wiki/Geddes_Dam)) - **Why it stayed:** Ann Arbor left Geddes and nearby Argo Dam decommissioned because recommissioning offered poor economics, while full removal was also not funded. ([en.wikipedia.org](https://en.wikipedia.org/wiki/Geddes_Dam)) - **Unique attribute:** although no longer used for power, the impoundment still shapes one of Ann Arbor's busiest outdoor recreation areas. ([en.wikipedia.org](https://en.wikipedia.org/wiki/Geddes_Dam)) - **Further information:** - https://www.a2gov.org/parks-and-recreation/parks-and-places/gallup-park/

Huron River at Ann Arbor Township, near Gallup Park, Michigan, USA