Lonesome Lake is a 12.2-acre water body located in Franconia Notch in the White Mountains of New Hampshire, south of Cannon Mountain. The lake is reachable by hiking trails from the Franconia Notch Parkway, including the Lafayette Place Campground, and takes approximately 2–3 hours. It features an Appalachian Mountain Club hut, which first open…Lonesome Lake is a 12.2-acre water body located in Franconia Notch in the White Mountains of New Hampshire, south of Cannon Mountain. The lake is reachable by hiking trails from the Franconia Notch Parkway, including the Lafayette Place Campground, and takes approximately 2–3 hours. It features an Appalachian Mountain Club hut, which first opened in 1930, on its southwest shore.