The Volcan Mountain Wilderness Preserve is approximately 2,900 acres of stunning landscape including mixed conifer forest. Home to the famous Hubbell Gateway at the entrance to the preserve, the main building at the Nature Center serves as an orientation point, indoor classroom and interpretive facility for local natural and cultural history. The mountain is the fountainhead of two of the county’s primary waterways: the San Dieguito and the San Diego River basins. With a pumping rate of about 15 gallons per minute, Ironside Spring at 4600 feet is the fountainhead of San Dieguito. The headwaters of the San Diego River begin about 2 miles northwest of the Wynola Valley, on the mountain’s lower south slope, with most of the flow captured by El Capitan Dam.