San Dimas Experimental Forest

Eldoradoville was a gold mining town in Los Angeles County, located in the San Gabriel Mountains. Established in 1859, after gold had been discovered in the river in 1855, Eldoradoville at its peak population had three stores and six saloons. It was washed away on January 18, 1862, in the Great Flood of 1862. One historian described it as "the Downieville of the south—a rough and tough miner's town."The site of Eldoradoville is on the East Fork of the San Gabriel River, on the north side of East Fork Road, where the Eldoradoville Campground is located at an elevation of 1,866 feet (569 m).

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.

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.

East Fork Road, located in the San Gabriel Mountains above the city of Azusa, California, is a road that gives access from State Route 39 into East Fork and other small townships, including Camp Williams, and Julius Klein Conservation Fire Camp 19, a minor offender prisoner housing complex where "LACO fire personnel provide training, which prepares inmates to safely conduct wild land firefighting operations."The road begins at Route 39, passing over the San Gabriel River, and follows the east fork of the river, crossing a number of small streams. The terminus is Heaton Flats, which has a campsite, a toilet facility, and trails that lead upstream and to the summit of Iron Mountain, 8,007 feet (2,441 m) above. Along East Fork Road there are extensive fire-fighting facilities which are staged to combat the many fires that break out among the foothills above Azusa, Glendora, and San Dimas every year. The road is located within the Angeles National Forest and is managed by the United States Forest Service. The United States Forest Service states that all mining operations, including gold panning, are illegal along the East Fork; however, as mining and prospecting are a historic relic of California's heritage, enforcement of the mining laws is infrequent and gold panning continues along this stretch of the road (which offers easy access to the river). Some of the sites of the area's mining heritage can be accessed from the road by visiting the site of "Eldoradoville", a mining town with three stores and six saloons that was established in 1859 and washed away in the flood of January 18, 1862.East Fork Road was initially planned as an outlet from the Los Angeles Area to State Route 2 and includes a "Bridge to Nowhere" that was abandoned after a flood; a later plan included two never-used tunnels on the aborted Shoemaker Canyon Road.In January 2005 a flood washed out two bridges, which stranded 200 campers and residents for days.

Big Dalton Dam is a multiple arch concrete dam in Los Angeles County, California, built for the Los Angeles County Flood Control District and completed in August 1929. The dam is one of the earliest of the multiple arch "double-wall" buttress designs of engineer Fred A. Noetzli. The 991 acre-foot (1.2 million cubic meter) dam provides water conservation and controls flooding from Big Dalton Canyon, a watershed within the San Dimas Experimental Forest, part of the Angeles National Forest in the San Gabriel Mountains. It is about 4 miles northeast of the city of Glendora and is operated by the Los Angeles County Department of Public Works.

The 1990 Upland earthquake occurred at 15:43:37 local time on February 28 with a moment magnitude of 5.7 and a maximum Mercalli Intensity of VII (Very strong). This left-lateral strike-slip earthquake occurred west of the San Andreas Fault System and injured thirty people, with total losses of $12.7 million. Many strong motion instruments captured the event, with an unexpectedly high value seen on water tank near the epicentral area.

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.

Potato Mountain is a mountain near Claremont, California at the southern edge of the San Gabriel Mountains. It is one of the first mountains visitors encounter entering the Angeles National Forest. Its summit is about 3,422 feet above sea level.

The Webb Schools is the collective name for two private schools for grades 9–12, founded by Thompson Webb, located in Claremont, California. The Webb School of California for boys was established in 1922, and the Vivian Webb School for girls in 1981. Both are primarily boarding schools, but they also enroll a limited number of day students. The Raymond M. Alf Museum of Paleontology is a part of The Webb Schools. The schools share a campus of approximately 150 acres (610,000 m2) in the foothills of the San Gabriel Mountains. In 2018, Webb purchased undeveloped land next to the existing campus and will now preserve the hillside and create a buffer between the campus and suburban development. There are 410 students and 57 faculty members, of which 25% hold doctorates, 80% hold advanced degrees and 74% live on campus (as of the 2018-2019 school year). Annual tuition (as of the 2019-2020 school year) is $66,130 for boarding students and $47,035 for day students, including meals, books, and fees. For the 2019–20 school year, Webb offered $5.5 million in need-based aid to 35 percent of the families, with awards ranging from several thousand dollars to nearly the full cost of tuition. The majority of ninth- and tenth-grade classes are taught in a single-sex environment. Co-educational courses are introduced to upperclassmen.The official student newspaper of The Webb Schools is the Webb Canyon Chronicle.

Padua Hills Theatre (1931–1974) was the longest running theater featuring Mexican-theme musicals in the United States. It operated as a non-profit business promoting intercultural understanding between European Americans and those of Mexican-descent.

Lutheran High School La Verne (also known as Faith Lutheran), was a private, college preparatory Lutheran High School in La Verne, California. Affiliated with the Lutheran Church–Missouri Synod (LCMS), the school served students from the San Gabriel, Pomona, and Inland valleys. Built on a foundation of faith in Christ, the school provided college preparatory curriculum to a co-educational student population in grades nine through twelve. The school colors were red, white and blue and the mascot was the Trojans. One special feature of the program at Lutheran High School was its Naval Junior Reserve Officer Training Corps program, which enrolled over 20% of the student population annually. It was one of only five NJROTC units in the United States that are available in a private school. Because of the achievements of the NJROTC Unit at Lutheran High School, the U.S. Navy rated LHS as an honor distinguished unit. NJROTC Scholarships were available for college-bound students. Enrollment at the school started to decline in 2000, and by 2023, the school was facing foreclosure. In 2020, the Pacific Southwest District of the LCMS gave financial support and worked with consultants from NextEd to determine the school's future viability. The results of that study led the school's board to announce the closure of the school after the 2022–23 school year.

The Bridge to Nowhere is an arch bridge that was built in 1936 north of Azusa, California, United States in the San Gabriel Mountains. It spans the East Fork of the San Gabriel River and was meant to be part of a road connecting the San Gabriel Valley with Wrightwood, California.