 Here, the highway connects to a pair of dirt roads, one of which leads north alongside Horseshoe Lake to Horseshoe.The two-lane route heads eastward from the trails, following the southern shore of Horseshoe Lake while traversing the deep woods of Adirondack Park.At the southeastern end of the lake, NY 421 turns northeastward, crossing a small stream feeding into the lake before curving back toward the east.