Sheep Mountain Wilderness

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.

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.

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.

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.

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

Telegraph Peak, is a peak of the San Gabriel Mountains, in the San Gabriel Mountains National Monument and San Bernardino County, California. With an elevation of 8,989 feet (2,740 m), it is highest point in the Cucamonga Wilderness of the San Bernardino National Forest.

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.

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).

The Sam and Alfreda Maloof Compound is a historic residential complex located at 5131 Carnelian Street in Alta Loma, California. The complex includes the house and workshop of woodworker and furniture designer Sam Maloof, who designed the buildings himself. Maloof's house includes hand-carved redwood doors and windows, which Maloof gradually carved to replace the pre-made fixtures. Maloof also replaced many of the house's functional elements with his own creations, including door handles and surrounds, rafters, and even toilet seats. Maloof used the adjacent workshop and display room to build and show his furniture, and he experienced his greatest period of success in the 1960s and 1970s while working in the house. The house was relocated in the early 2000s when California State Route 210 was built through the area; it is now a museum of Arts and Crafts work.The property was added to the National Register of Historic Places on November 9, 2010.

San Antonio Heights is a census-designated place (CDP) in the San Bernardino County, California. It is in the northern Pomona Valley and the foothills of the San Gabriel Mountains. The population was 3,371 at the 2010 census, up from 3,122 at the 2000 census.

San Antonio Dam is an embankment flood control and debris dam on San Antonio Creek in San Bernardino County, California, about 5 miles (8.0 km) north of Ontario. The dam was authorized by the Flood Control Acts of 1936 and 1938 as part of a major program to provide flood protection in the Santa Ana River system. Construction began in April 1952 and finished in May 1956. The dam controls runoff from a rugged catchment area of 27 square miles (70 km2) in the San Gabriel Mountains.The dam was built by the Los Angeles District of the U.S. Army Corps of Engineers. The dam is 3,850 feet (1,170 m) long, 160 feet (49 m) high above the foundation, and 130 feet (40 m) above the riverbed. The main embankment contains 6,050,000 cubic yards (4,630,000 m3) of material. The reservoir behind the dam is usually dry, but can fill with up to 11,880 acre-feet (14,650,000 m3) of water after large flooding events. A concrete overflow spillway on the west side prevents overtopping and drains to the San Antonio and Chino Creek channels, which were lined with concrete between 1956 and 1960 to protect against such an event.A project has been underway since 2012 to remediate seepage problems at the toe of the dam during heavy rainstorms. The dam is considered a high hazard structure.