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Union River (Maine) facts for kids

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For other rivers of the same name, see Union River (disambiguation).
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Union River
Union River in Ellsworth, ME IMG 2397.JPG
The Union River in Ellsworth, Maine
Country United States
Physical characteristics
Main source Maine
River mouth Union River Bay
sea level
Length 22 miles (35 km)
Basin features

The Union River is a 21.9-mile-long (35.2 km) river that runs through Ellsworth, the county seat of Hancock County in eastern Maine. In the colonial era, it was known as the Mount Desert River.

The river forms at the north end of Graham Lake at the confluence of the river's East and West branches (44°43′48″N 68°23′04″W / 44.7300°N 68.3844°W / 44.7300; -68.3844 (Union River source)), 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.

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