Desert bighorn sheep establish two desert areas in southwestern Arizona to help preserve the desert bighorn sheep: Cabeza Prieta National Wildlife Refuge and the Kofa National Wildlife Refuge. In 1941, the San Andres National Wildlife Refuge in New Mexico was added. Desert bighorn sheep populations have trended upward since the 1960s when their population was estimated at 6,700-8,100. The upward trend was caused by conservation measures, including habitat preservation. In 1980, desert bighorn sheep populations were estimated at 8,415-9,040. A state-by-state survey was conducted a few years later and estimated the overall US desert bighorn sheep population at 15,980. The 1993 estimate of
Chumash Painted Cave State Historic Park to possibly 1000 years or more. There is also evidence of graffiti beginning with early white settlers, which eventually led to creation of a protective physical barrier and State Historic Park status. In 1972 it was added as Site #72000256 on the National Register of Historical Places. Access is from State Route 154 about north of U.S. Route 101 in the San Marcos Pass in the Santa Ynez Mountains, on Painted Cave Road. The cave is adjacent to the left side of this narrow one-lane mountain road, with a slightly widened shoulder that provides parking for one or two vehicles.