Big Dalton Dam

Rancho San Jose was a 22,340-acre (90.4 km2) Mexican land grant in northeastern Los Angeles County given in 1837 by Governor Juan Bautista Alvarado to Ygnacio Palomares and Ricardo Véjar. Today, the communities of Pomona, LaVerne, San Dimas, Diamond Bar, Azusa, Covina, Walnut, Glendora, and Claremont are located in whole or part on land that was once part of the Rancho San Jose.

California 26th congressional district is a congressional district in the U.S. state of California currently represented by Democrat Julia Brownley. The district is located on the South Coast, comprising most of Ventura County as well as a small portion of Los Angeles County. Cities in the district include Camarillo, Oxnard, Santa Paula, Thousand Oaks, Westlake Village, Moorpark, and part of Simi Valley. In 2022, the district lost Ojai and most of Ventura and added Calabasas, Agoura Hills, and the sparsely populated northern half of Ventura County.From 2003 to 2013, the district spanned the foothills of the San Gabriel Valley from La Cañada Flintridge to Rancho Cucamonga. David Dreier, a Republican, represented the district during this period.

The Colby Fire was a wildfire in the Angeles National Forest. It was ignited along the Colby Truck Trail in the San Gabriel Mountains in northern Los Angeles County, United States. The fire started on January 16, 2014, and eventually burned 1,992 acres. On January 25, the Colby Fire had burned 1,962 acres, and was 98% contained. The fire, which was fanned by strong Santa Ana winds, destroyed five homes, injured one person, and forced the evacuation of 3,600 people at its peak.Three men in their early 20s were arrested for recklessly starting a fire, and have allegedly admitted starting an illegal campfire that blew out of control. They will face federal charges of unlawfully causing timber to burn. Bail has been set at $500,000 for each of them "due to the seriousness of the crime, as well as the high cost of damaged property and resources to fight the fire." One of the men, a transient, has been placed in a residential drug treatment facility. Two of the homeless men were convicted of lighting and failing to control an illegal campfire; the third person is scheduled to go to trial later in 2014.January fires are unusual in Southern California, but there was little rainfall in the area leading up to the fire, which led to a "red flag" fire danger situation. Warm temperatures, low humidity, and an excess of dry brush in the foothills around Glendora (which had not burned significantly since the 1960s) encouraged the growth of the fire.

San Dimas Dam is a concrete gravity dam in Los Angeles County, California. The dam and its flood control basin/reservoir are in the San Gabriel Mountains and within the Angeles National Forest. The dam is currently operated by the Los Angeles County Department of Public Works but was originally built by the Los Angeles County Flood Control District in 1922. The dam controls flooding from San Dimas Creek, a major San Gabriel Mountains drainage and tributary of the San Gabriel River. As a flood control facility the San Dimas Reservoir is dry for most of the year, only storing water after significant winter storms. The regulation provided by the dam allows for the efficient diversion of floodwaters from San Dimas Wash to Puddingstone Reservoir, which protects the San Dimas area of the San Gabriel Valley.

Glendora Unified School District is a public school district based in Glendora, Los Angeles County, California, United States. The school district covers northern and central Glendora. The school board is composed of five members, at-large, elected to a four-year term. The elections are currently held on a Tuesday after the first Monday in November of odd-numbered years until the 2017 election, then they will switch to even-numbered years starting with the November 2020 election to coincide with the California General Election.

Glendora High School (GHS) is located in Glendora, Los Angeles County, California, United States.

Rubel Castle (also known as Rubelia) was established in Glendora, California, by Michael Clarke Rubel (April 16, 1940 – October 15, 2007) and is owned and operated by the Glendora Historical Society.In 1959, Rubel purchased a 1.7 acre citrus orchard on which the structure resides. He and his friends completed construction in 1986. Rubel Castle was constructed partly out of concrete, as well as nontraditional materials including scrap steel, rocks, bedsprings, coat hangers, bottles, and other repurposed materials that Rubel salvaged from the neighborhood as ranches and barns were giving way to tract houses. Chickens and other animals are frequently sighted.

The San Dimas Biosphere Reserve and Experimental Forest is an experimental forest located in the front range of the San Gabriel Mountains of southern California. San Dimas constitutes a protected field laboratory jointly managed by the Angeles National Forest and the Pacific Southwest Research Station of the United States Forest Service under the designation San Dimas Experimental Forest. It was designated as a UNESCO Biosphere Reserve in 1976 and withdrawn from the programme in July 2018.It encompasses the upper Big Dalton and San Dimas watersheds. The 6,495 hectares (25.08 sq mi) experimental forest was originally established in 1933 and was designated as a biosphere reserve in 1976.San Dimas is a chaparral-dominated Mediterranean ecosystem. In addition to the chaparral vegetation (including chamise), riparian woodland, sage-buckwheat and barren areas, oak woodland and open yellow pine woodlands are represented. The Fern Canyon Research Natural Area is in the remote eastern part the San Dimas reserve. This 555 hectares (2.14 sq mi) Research Natural Area includes Brown's Flat, a locally unique mountain meadow that supports a relict grove of ponderosa pine (Pinus ponderosa Douglas ex C. Lawson).In addition to Fern Canyon, the reserve's research facilities include over 50 gauged watersheds, a lysimeter complex, two major dams and reservoirs—San Dimas Dam and Big Dalton Dam—and three plantations of domestic and introduced trees.Studies at San Dimas have provided valuable information on air pollution, fire effects, erosion, hydrology, and plants and animals in southern California watersheds. The area also provides opportunities for ecological research to many nearby colleges, universities and governmental agencies.Wildfires have frequently burned through the San Dimas area, most recently when the Williams Fire burned much of the forest in September 2002.The forest is currently closed for the general public, except under special written permit. No hunting or other recreational activities are currently allowed.

The South Hills are a low mountain range of the Transverse Ranges, within the San Gabriel Valley in eastern Los Angeles County, California.The South Hills are north of the Interstate 210 Freeway, in the southern part of the city of Glendora, with the western portion of the hills in the City of Glendora's South Hills Park. They are north of the unincorporated town of Charter Oak and northwest of the city of San Dimas.

San Gabriel Dam is a rock-fill dam on the San Gabriel River in Los Angeles County, California, within the Angeles National Forest. Completed in 1939, the dam impounds the main stem of the San Gabriel River about 2.5 miles (4.0 km) downstream from the confluence of the river's East and West Forks, which drain a large portion of the San Gabriel Mountains. It is located directly upstream from the Morris Dam. The dam provides flood control, groundwater recharge flows and hydroelectricity for the heavily populated San Gabriel Valley in the Greater Los Angeles metropolitan area.