Dunes Drive is an eight-mile connecting road from US Route 70 to the Alkali Flat Trailhead in White Sands National Park. Dunes Drive was constructed following the designation of White Sands National Monument between 1936-1940. The last approximate four miles of Dune Drive are unsurfaced and require traveling over graded gypsum sand. White Sands National Park was designated into law during December 2019.
https://www.gribblenation.org/2023/11/dunes-drive-of-white-sands-national-park.html