The Suncook Lakes are a pair of lakes located in Belknap County in central New Hampshire, United States, in the town of Barnstead. Upper Suncook Lake encompasses 402 acre, while Lower Suncook Lake covers 295 acre. The lakes are connected by a 1000 ft channel, spanned by a road bridge. A dam at the outlet of Lower Suncook Lake controls the water level of both lakes. The lakes are located along the Suncook River, a tributary of the Merrimack River. There are three islands on Lower Lake. Lower Suncook Lake has an average depth of 9 ft and a maximum depth of 16 ft, while Upper Suncook Lake has a greater average depth and a maximum depth greater than 40 ft. The lakes are classified as a warmwater fishery, with observed species including smallmouth and largemouth bass, chain pickerel, horned pout, and white perch. Rainbow trout can be found in the deeper Upper Suncook Lake.