Big Bear Lake is a reservoir in the San Bernardino Mountains, in San Bernardino County, California, United States. At a surface elevation of 6750ft, it has an east-west length of approximately 7mi and is approximately 2.5mi at its widest measurement, though the lake's width mostly averages a little more than 1mi. These approximations are based on the lake having an optimum retainable water level. At dam's end Big Bear measures its deepest water at 72ft. It is a completely snow-fed lake, having no other means of tributary or mechanical replenishment.Located 100mi east of Los Angeles and surrounded by the San Bernardino National Forest, Big Bear Lake is accessible via four scenic highways: Highway 330 from Highland, Highway 38 from Redlands, Highway 138 from Victorville, and Highway 18 from San Bernardino.Defining surroundingsBig Bear Lake is geophysically defined by its North Shore and its South Shore. Big Bear Boulevard follows the South Shore and leads into the Big Bear Valley as a continuation of Highway 18 (the so-called Rim of the World Highway, which approaches from the west). Big Bear Boulevard winds east through Papoose Bay, Boulder Bay and Metcalf Bay, then leads directly east to the city of Big Bear Lake. At a point called The Village, the road turns toward the lake and then curves eastward to Moonridge, the ski resorts at Snow Summit and Bear Mountain, and Stanfield Cutoff, a causeway located near the east end of the lake. Big Bear Boulevard then continues east into Big Bear City, which is an unincorporated community despite its name. Bear Creek and Siberia Creek flow into the lake and Bear Creek flows out of the lake, traveling about 9mi southwest to the Santa Ana River.