Oat Mountain (California)

The Santa Susana Mountains are a transverse range of mountains in Southern California, north of the city of Los Angeles, in the United States. The range runs east-west, separating the San Fernando Valley and Simi Valley on its south from the Santa Clara River Valley to the north and the Santa Clarita Valley to the northeast. The Oxnard Plain is to the west of the Santa Susana Mountains.

The Aliso Canyon gas leak (also called Porter Ranch gas leak and Porter Ranch gas blowout) was a massive natural gas leak in the Santa Susana Mountains near Porter Ranch, Los Angeles, California. Discovered on October 23, 2015, gas was escaping from a well within the Aliso Canyon underground storage facility. This second-largest gas storage facility of its kind in the United States belongs to the Southern California Gas Company (SoCal Gas), a subsidiary of Sempra Energy. On January 6, 2016, Governor Jerry Brown issued a state of emergency. On February 11, the gas company reported that it had the leak under control. On February 18, state officials announced that the leak was permanently plugged. An estimated 97,100 tonnes (95,600 long tons; 107,000 short tons) of methane and 7,300 tonnes (7,200 long tons; 8,000 short tons) of ethane were released into the atmosphere. The initial effect of the release increased the estimated 5.3 Gt of methane in the Earth's atmosphere by about 0.002%, diminishing to half that in 6–8 years. It was widely reported to have been the worst single natural gas leak in U.S. history in terms of its environmental impact. By comparison, the entire rest of the South Coast Air Basin combined, with a population of about 18 million people, emits approximately 413,000 tonnes of methane and 23,000 tonnes of ethane annually. The Aliso gas leak's carbon footprint could be larger than the Deepwater Horizon leak in the Gulf of Mexico.

The Aliso Canyon Oil Field (also Aliso Canyon Natural Gas Storage Field, Aliso Canyon Underground Storage Facility) is an oil field and natural gas storage facility in the Santa Susana Mountains in Los Angeles County, California, north of the Porter Ranch neighborhood of the City of Los Angeles. Discovered in 1938 and quickly developed afterward, the field peaked as an oil producer in the 1950s, but has remained active since its discovery. One of its depleted oil and gas producing formations, the Sesnon-Frew zone, was converted into a gas storage reservoir in 1973 by the Southern California Gas Company, the gas utility servicing the southern half of California. This reservoir is the second-largest natural gas storage site in the western United States, with a capacity of over 86 billion cubic feet of natural gas. Currently it is one of four gas storage facilities owned by Southern California Gas, the others being the La Goleta Gas Field west of Santa Barbara, Honor Rancho near Newhall, and Playa del Rey. Oil production on the field continues from 32 active wells as of 2016. The gas storage reservoir is accessed through 115 gas injection wells, along with approximately 38 miles of pipeline internal to the field. Three operators were active on the field: Southern California Gas Company, The Termo Company, and Crimson Resource Management Corp.

Sand Rock Peak is a mountain that overlooks Newhall and the rest of Santa Clarita Valley to the northeast. The summit is at an elevation of 2,511 feet (765 m). Sand Rock Peak is part of the Santa Susana Mountains. Oat Mountain, a higher mountain, is south of Sand Rock Peak, and can be seen from there.

Pisgah Grande (1914-1920) was a Pentecostal Christian community in Las Llajas Canyon north of Simi Valley founded by Dr. Finis E. Yoakum. In 1920 his successor, James Cheek, moved the colony to Pikesville, Tennessee. Dr. Yoakum had experienced a spiritual awakening and decided to devote his life to religious pursuits after a miraculous recovery from a carriage accident in 1895 in Denver. He relocated to Los Angeles where he founded several charitable enterprises named Pisgah, after the peak in the Sinai from which Moses saw the promised land. Beside Pisgah Grande there was Pisgah Home in the Highland Park section of Los Angeles, Pisgah Store, Pisgah Ark, a recovery house for women, and Pisgah Gardens, a rehabilitative center, orphanage, and farm in North Hollywood. Associated with the Christ Faith Mission of Highland Park, Pisgah Grande served as a mission and a rehabilitation center for the poor and destitute of Los Angeles and other nearby areas. At one point the community had 300 members and its own post office.

Renaissance Summit (also known simply as Renaissance or Renaissance at Porter Ranch) is a gated housing subdivision in the northwest San Fernando Valley of the city of Los Angeles, at the highest point in the Porter Ranch neighborhood. Its building and opening was championed by major local political figures in the 1980s and 1990s but was also an ongoing source of controversy in the area.

The Sesnon Fire (also known as the Porter Ranch Fire) was a wildfire that broke out near the oil fields of Oat Mountain, north of Porter Ranch, California, on Monday October 13, 2008. The cause of this fire was a power line falling onto dry brush near a drainage area. A state of emergency was declared by Governor Arnold Schwarzenegger on October 13 in Los Angeles and Ventura Counties. The fire burned more than 22 square miles (57 km2) and cost US$7.9 million to fight. This fire occurred concurrently two others, one in San Diego County and another at the eastern end of the San Fernando Valley. One person lost their life due to the low visibility on highways because of the smoke from the fire.

Santa Clarita Woodlands Park is a 4,000 acre (1,619 hectare) open space preserve located in the northeastern foothills of the Santa Susana Mountains near Santa Clarita, California.

Well No. 4, Pico Canyon Oilfield, located about seven miles (11 km) west of Newhall, California, in the Santa Susana Mountains, was the first commercially successful oil well in the Western United States and is considered the birthplace of California's oil industry. Drilled in 1876, it turned nearby Newhall into a boomtown and also spawned a smaller boomtown called Mentryville adjacent to the drilling site. Well No. 4 continued in operation for 114 years until it was capped in 1990. The site was designated a National Historic Landmark in 1966, and the Mentryville ghost town is now open to the public as a historic park.

Mentryville was an oil drilling town in the Santa Susana Mountains in Los Angeles County, California, USA. It was started by Charles Alexander Mentry in the 1870s around the newly discovered oil reserves in that area. The first oil strike was on September 26, 1876. The town is located at the terminus of Pico Canyon Road, four miles west of the Lyons Avenue exit from I-5 in Santa Clarita. It is currently a part of Stevenson Ranch.

Rocky Peak, located in Rocky Peak Park, is the fourth-highest point in the Santa Susana Mountains, and overlooks the San Fernando Valley and Chatsworth, the Simi Hills, and the Simi Valley in Southern California. The peak, which is 2,715 feet (828 m) in elevation, sits on the Los Angeles County–Ventura County line.

Porter Ranch is a suburban-type neighborhood of the City of Los Angeles in the northwest portion of the San Fernando Valley.