| Penacook Lake | |
|---|---|
| Long Pond | |
 Penacook Lake from the south | |
  Penacook Lake  Penacook Lake | |
| Location | Merrimack County, New Hampshire |
| Coordinates | 43°13′52″N 71°35′29″W / 43.23111°N 71.59139°W |
| Primary outflows | Tributary of Merrimack River |
| Basin countries | United States |
| Max. length | 2.3 miles (3.7 km) |
| Max. width | 0.6 miles (1.0 km) |
| Surface area | 362 acres (1.5 km2) |
| Surface elevation | 402 feet (123 m) |
| Settlements | Concord |
Penacook Lake is a 362-acre (1.5 km2)[1] lake located in Merrimack County in central New Hampshire, United States, in the city of Concord. It has also been known as "Long Pond".[2] It is the largest lake in Concord and serves as the city's water supply. Water that is not captured by the city's water treatment plant flows two-thirds of a mile to the Merrimack River.
