Lake Monomonac

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Lake Monomonac
Location	Cheshire County, New Hampshire; Worcester County, Massachusetts
Coordinates	42°43′3″N, 71°59′43″WCoordinates: 42°43′3″N, 71°59′43″W
Primary inflows	North Branch Millers River
Primary outflows	North Branch Millers River
Basin countries	United States
Max. length	2.7 miles (4.3 km)
Max. width	0.7 miles (1.1 km)
Surface area	594 acres (2.4 km²)
Surface elevation	318.5 meters
Islands	Blueberry Island; Paradise Island
Settlements	Rindge, New Hampshire; Winchendon, Massachusetts

Lake Monomonac is an artificial lake that straddles the border between Rindge, New Hampshire and Winchendon, Massachusetts. It was created from a small pond in New Hampshire by the construction of dams on the North Branch of the Millers River, a part of the Connecticut River watershed.

Lake Monomonac is 594 acres (2.4 km²) in size with 410 acres (1.7 km²) in New Hampshire and the remaining 184 acres (0.7 km²) in Massachusetts^[1]. The lake has a maximum recorded depth of twenty-five feet and an average depth of ten feet.