The south basin of Lake Winnisquam is south of the US-3 and NH-11 bridge.

Lake Winnisquam in the Lakes Region of central New Hampshire is the fourth-largest lake entirely in New Hampshire, covering 4,214 acres and having a maximum depth of 155 feet. The lake is fed by the Winnipesaukee River, which also flows out of the lake to join the Merrimack River. Lake Winnisquam has two basins, a larger northern one and a smaller southern one, separated by a bridge carrying US-3 and NH-11. Lake Winnisquam offers a variety of recreational activities, such as bird watching, boating, swimming, fishing, hiking, golfing, and rail biking. The lake is surrounded by five towns: Meredith, Laconia, Sanbornton, Belmont, and Tilton.