what mountain center california
From Wikipedia, the free encyclopedia. Mountain Center is a census-designated place in west central Riverside County, California. It lies along State Route 74 in the southern division of San Bernardino National Forest, just north of Lake Hemet. Mountain Center lies midway between Hemet and Palm Desert, and it is southeast of the city of Riverside, the county seat of Riverside County. Its elevation is 4,518 feet (1,377 m).