Telegraph Peak (California)

Timber Mountain is a peak of the San Gabriel Mountains, located in the Cucamonga Wilderness, Angeles National Forest, San Bernardino County, California.

The Cucamonga Wilderness is a federally designated wilderness area located in the eastern San Gabriel Mountains, in San Bernardino County, Southern California. The 12,781 acres (5,172 ha) wilderness is managed by the United States Forest Service in Angeles National Forest and San Bernardino National Forest Elevations range from about 5,000 to 9,000 feet (1,500 to 2,700 m).

Cucamonga Peak is one of the highest peaks of the San Gabriel Mountains in San Bernardino County, California, with a summit elevation of 8,862 feet (2,701 m). It is within the Cucamonga Wilderness of the San Bernardino National Forest. It is named after the 19th-century Mexican land grant, Rancho Cucamonga, that was below it.

Ontario Peak is a 8,696 ft (2,651 m) high peak in the San Gabriel Mountains of California. Like its neighbor Cucamonga Peak, it is in the San Bernardino National Forest, and in the Cucamonga Wilderness. The peak is named for the nearby city of Ontario, about 12 mi (19 km) due south, and first appeared in the United States General Land Office Forest Atlas in 1908. The most accessible trailhead for hiking Ontario Peak is in Icehouse Canyon. Forest Service Trail 7W07 leads from here to Icehouse Saddle, from which the Ontario Peak Trail leads to the summit. This route is 13 miles (20.9 km) round trip, with 4,100 feet (1,200 m) of elevation gain.

Sheep Mountain Wilderness is a wilderness area of 41,883 acres (169 km2) within the San Gabriel Mountains National Monument and managed by the Angeles National Forest. It is within Los Angeles County and San Bernardino County, southern California. The U.S. Congress passed the California Wilderness Act of 1984, which created this wilderness area and added it to the National Wilderness Preservation System. The wilderness includes Iron Mountain, an 8,007 ft (2,441 m) peak.

Mount Baldy or Mount Baldy Village, formerly Camp Baynham and Camp Baldy, is an unincorporated community in the San Gabriel Mountains located in San Bernardino County and Los Angeles County in Southern California, with the county line running through the community. It is located below Mount San Antonio, commonly known as "Mount Baldy", hence its name.

The Mt Baldy School District consists of one school, Mt Baldy School, that serves students in grades K-8 in Mount Baldy, California, USA.

Lookout Mountain in Los Angeles County, California, is a 6,812-foot (2,076 m) peak on the shoulder of Mount San Antonio ("Mount Baldy"). Albert A. Michelson used the peak to measure the speed of light in 1925–1929. For him to do so, the United States Coast and Geodetic Survey in 1923 established a 21.5-mile (34.6 km) baseline with an accuracy of 1 part in 11 million from Pasadena, California, at the base of Mount Baldy roughly to Rancho Cucamonga at the base of Mount Wilson. It may have been the most accurate baseline ever determined at the time. The Coast and Geodetic Survey then used the baseline to triangulate the distance to the Mount Wilson Observatory, with a distance error of about 1 part in 5 million, and Michelson measured light travel time between the stations with a rotating mirror apparatus. The concrete piers on Lookout Mountain used for the Michelson observations still exist.The first fire lookout in the Angeles National Forest was built on Lookout Mountain in 1914 and stood until it burned in 1927.

The Pomona Water Power Plant, built in 1892, was the first AC power plant in California. It fed electricity to the Pomona Valley, and was designated a California Historic Landmark (No.514) on November 25, 1953.

Bonita Falls are a set of waterfalls in the San Bernardino National Forest, formed by Bonita Creek, that is said to be 370 or 400 feet (113 or 122 meters) in height, but possibly up to 495 feet high because of two undocumented drops in the canyon above. It is the second tallest in the national forest, being surpassed only by 500-foot (150 m) Big Falls. These two waterfalls are reputably the tallest in southern California.

Lytle Creek is a census-designated place in the San Gabriel Mountains, within San Bernardino County. It is about 16 miles (26 km) northwest of downtown San Bernardino and 10 miles (16 km) from the cities of Fontana and Rialto. This small remote community is located in a large southeast-trending canyon on the eastern portion of the San Gabriel Mountains completely within the boundaries of the San Bernardino National Forest. The population was 701 at the 2010 census. The ZIP Code for Lytle Creek is 92358 and the community is inside area code 909.

Arrowhead Farms is an unincorporated community of San Bernardino County, California. It is now a foothill and rural neighborhood of the city of San Bernardino located just northeast of the Interstate 215 and Interstate 210 junction. Arrowhead Farms is in the 92407 ZIP Code and is within the 909 area code.