Glen Helen Regional Park
Glen Helen Regional Park, located in San Bernardino, California, was the site of both US Festivals of the early 1980s. It is also home to the San Manuel Amphitheater, the largest outdoor amphitheater in the United States. The park also hosts several off-road races since 1985.
Glen Helen Regional Park is the site of California Historical Landmark NO. 573 SYCAMORE GROVE. Its location is at Glen Helen Regional Park, 2555 Devore Rd, 0.7 mi W of Devore. Sycamore Grove was the first rest stop after the old Native American Mohave Trail left the West Fork Mojave River, following the trail, to cross the San Bernardino Mountains at Monument Peak, descending into Cajon Canyon on the ridge between Cable Canyon and Devil Canyon. This route was used by Father Francisco Garcés in March 1776 and Jedediah Smith in 1826.
Sycamore Grove, named by the 1851 Mormon colonists, later called Martin's Ranch, Sycamore Valley Ranch, and Glen Helen Ranch, was a rest and water spot at the bottom of Cajon Pass on the Old Spanish Trail mentioned as a camp in the itinerary of Antonio Armijo in 1830. It was also located at the mouth of a pass at 34°12′17″N 117°24′39″W / 34.20472°N 117.41083°W, (informally known as Devore Pass), between Sycamore Grove and Sycamore Flat that the trail passed over and then followed westward to the Mission San Gabriel. Sycamore Grove also lay within the boundaries of the 1843 Rancho Muscupiabe land grant.
...
Wikipedia