New Mexico State Road 7 is approximately a seven-mile highway in the Guadalupe Mountains of Eddy County. New Mexico State Road 7 connects US Route 62/US Route 180 at Whites City to the visitor center of Carlsbad Caverns National Park via Walnut Canyon. The so-called Carlsbad Caverns Highway to the National Park visitor center complex was constructed following the designation of the namesake National Monument in 1923. The current iteration of New Mexico State Road 7 was designated by the New Mexico State Highway Commission during June 1929. A proposal once was once floated to connect New Mexico State Road 7 to a cavern drive which would have been blasted into Big Room.
https://www.gribblenation.org/2023/11/new-mexico-state-road-7-carlsbad.html