| Lake Monomonac | |
| Location: | Cheshire County, New Hampshire |
| Coords: | 42.7175°N -71.9953°W |
| Basin Countries: | United States |
| Length: | 2.7miles |
| Width: | 0.7miles |
| Area: | 594acres |
| Depth: | 10feet |
| Max-Depth: | 22feet |
| Elevation: | 318.5m (1,044.9feet) |
| Islands: | Blueberry Island; Paradise Island |
| Cities: | Rindge, NH |
| Pushpin Map: | Massachusetts#New Hampshire#USA |
| Pushpin Label Position: | bottom |
| Pushpin Map Alt: | Location of Lake Monomonac in Massachusetts and New Hampshire, USA. |
Lake Monomonac is an artificial lake that straddles the border between Rindge, New Hampshire, and Winchendon, Massachusetts, in the United States. 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 in size, with in New Hampshire and the remaining in Massachusetts. The lake has a maximum recorded depth of and an average depth of .
The lake is classified as a warmwater fishery, with observed species including smallmouth and largemouth bass, black crappie, chain pickerel, white perch, pumpkinseed, bluegill, horned pout, and green sunfish.[1]