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
Desert Inn in 2000, he decided to demolish it and build a new hotel and resort. The remaining towers of the Desert Inn were imploded in 2004. Today, the Wynn and Encore are now where the Desert Inn once stood. The original performance venue at the Desert Inn was the Painted Desert Room, later the Crystal Room, which opened in 1950 with 450 seats. Frank Sinatra made his Las Vegas debut there on September 13, 1951 and became a regular performer. The property included an 18-hole golf course which hosted the PGA Tour Tournament of Champions from 1953 to 1966. The golf