Lovell Lake is a 538-acre (2.18 km2) water body in Carroll County in eastern New Hampshire, United States, in the town of Wakefield. The lake is both spring-fed and fed by small streams including Horse Brook. The outlet of the lake, located at the village of Sanbornville, is the beginning of the Branch River. From here, the Branch River flows through Milton where it joins the Salmon Falls River on the Maine-New Hampshire border. The Salmon Falls River empties into the tidal waters of the Piscataqua River northwest of Portsmouth, New Hampshire, then into the Gulf of Maine.