Union River (Maine)
|River mouth||Union River Bay
|Length||22 miles (35 km)|
The river forms at the north end of Graham Lake at the confluence of the river's East and West branches ( ), on the border of the towns of Mariaville and Waltham. It runs south 13 miles (21 km) through Graham Lake to the dam at the lake's outlet, then continues south through Ellsworth, flowing through Leonard Lake and passing over its outlet dam just above the downtown. The Leonard Lake dam, also known as The Ellsworth Dam, built in 1907, spans the Union River and forms Lake Leonard. It houses a powerhouse with four generating units that combined produce 29,907 megawatt hours per year, enough to power about 3,000 households. At downtown Ellsworth, the river reaches tidewater, and flows south as an estuary for 5 miles (8 km) to its mouth at Union River Bay, on the border of Surry and Ellsworth, and thence into Blue Hill Bay.
- U.S. Geological Survey. National Hydrography Dataset high-resolution flowline data. The National Map Archived 2012-04-05 at WebCite, accessed June 22, 2011
- Maine League of Historical Societies and Museums (1970). Doris A. Isaacson, ed. Maine: A Guide 'Down East'. Rockland, Me: Courier-Gazette, Inc. p. 344.
- "Union River". Geographic Names Information System. United States Geological Survey. 30 September 1980. Retrieved 2010-03-24.
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