Powder Mill Pond is a 419-acre (1.70 km2) impoundment on the Contoocook River in Hillsborough County in southern New Hampshire, United States. The pond's dam is located in the town of Bennington, with water impounded into the towns of Hancock and Greenfield.The lake is classified as a warmwater fishery, with observed species including smallmouth and largemouth bass, chain pickerel, horned pout, black crappie, and bluegill.