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San Bernardino Mountains

The San Bernardino Mountains are a high and rugged mountain range in Southern California in the United States. The mountain range is part of the Transverse Ranges and lies north and northeast of San Bernardino and spanning two California counties, the range tops out at 11,503 feet (3,506 m) at San Gorgonio Mountain – the tallest peak in Southern California. The San Bernardinos form a significant region of wilderness and are popular for hiking and skiing.

Geography and climate
The San Bernardinos run for approximately from Cajon Pass in the northwest – which separates them from the San Gabriel Mountains – to San Gorgonio Pass, across which lie the San Jacinto Mountains, in the southeast. The Morongo Valley in the southeast divides the range from the Little San Bernardino Mountains. The mountains feature a steep drop into the Coachella Valley and San Gorgonio Pass – the latter of which is one of the deepest mountain passes in the United States, exceeding the Grand Canyon's depth by over . Many cities lie at the base of the San Bernardino Mountains. These include San Bernardino, Redlands and Yucaipa in the south; Yucca Valley to the east; and Hesperia to the northwest. In addition, there are several mid-sized to large towns in the mountains themselves, including Big Bear Lake, Big Bear City, Crestline, Lake Arrowhead and Running Springs. Several regional streams and rivers also have their headwaters in the mountains. The principal drainage is provided by the Santa Ana River, which runs westwards into the Pacific Ocean in Orange County.{{cite web The San Bernardino Mountains (along with the adjacent San Gabriel and San Jacinto Mountains) are a humid island in the mostly semi-arid southern California coastal plain. Parts of the San Bernardino Mountains have annual precipitation totals in excess of (e.g. Lake Arrowhead and Barton Flats areas), and provide an important water resource for the coastal plain below. Most of the precipitation falls between November and April; summers are mostly dry except for infrequent thunderstorms during late summer. During the colder winter storms, snow can fall below , but most usually falls above . Ski resorts (mostly in the Big Bear area) capitalize on this snowfall, the most reliable in California south of the Sierra Nevada Mountains. ==Geology==
Geology
The San Bernardinos are part of the Transverse Ranges of Southern California, a mountain chain formed by tectonic forces between the North American and Pacific Plates along the San Andreas Fault. These mountains are shaped by several primary tectonic or fault blocks – the Big Bear block, which forms the large montane plateau that characterizes the northern portions of the range; and the more complex and fractured San Gorgonio, Wilson Creek and Yucaipa Ridge blocks, which form the rugged and heavily dissected southern parts of the mountains. Because of their large, steep rise above the surrounding terrain, the San Bernardinos have been subject to great amounts of erosion that have carved out numerous river gorges. Rocks and sediment from the mountains are deposited on the surrounding valley floors as massive alluvial fans. ==History==
History
Indigenous peoples Archaeological discoveries in the San Bernardino Valley suggest that humans have populated the region for at least 10,000-12,000 years. Several Native American groups held the lands surrounding the San Bernardinos. These included the Tongva, who occupied the Inland Empire area southwest of the mountains; the Cahuilla, who lived in the Coachella Valley and Salton Sea basin; and the Serrano and Chemehuevi peoples, whose territory comprised land north and northeast of the San Bernardinos, adjacent to the Mojave Desert. Most of these tribes did not have permanent settlements in the mountains, with the possible exception of a few groups of Serrano. Indigenous peoples traveled into the mountains in the summer to hunt deer and rabbits, gather acorns, berries and nuts, and seek refuge from the desert heat. History During the 17th and 18th centuries, various Spanish explorers passed through coastal Southern California and claimed the area for Spain. In 1769, the Spanish government began an effort to bring what they called Alta California under their control and introduce Christianity to native peoples through the construction of missions. In 1810, Francisco Dumetz led a small company to build a temporary chapel near what is now Redlands. On May 20, the Feast Day of Bernardino of Siena, Dumetz named the San Bernardino Valley. This name was applied to San Bernardino Peak by 1835, and was in wide use for the entire range by 1849. In 1819, San Bernardino de Sena Estancia was created near present-day San Bernardino as an outpost of nearby Mission San Gabriel Arcángel. Although sometimes referred to as an asistencia, or "a mission on a small scale with all the requisites for a mission, and with Divine Service held regularly on days of obligation, except that it lacked a resident priest", San Bernardino was an estancia, or cattle ranch. In 1820, a irrigation ditch or "zanja" was dug using Native American labor to furnish water from Mill Creek, a major stream flowing out of the San Bernardinos, to the estancia and surrounding croplands. valley was the first area of the mountains to be logged. Beginning in 1851, Mormon colonists began emigrating to the San Bernardino Valley. The Mormons bought and subsequently split up Rancho San Bernardino, and greatly improved the area's agricultural production by bringing in thousands of head of livestock and overhauling the local irrigation network. In order to obtain lumber for their settlements, they also began the first large-scale logging operations in the San Bernardino Mountains, starting in the Mill Creek valley. Luis Vignes built the first sawmill in the range sometime between 1851 and 1853. By 1854, six lumber mills were in operation in the mountains, some as high as the crest of the range three-quarters of a mile above San Bernardino, accessed by a twisting road through Waterman Canyon. Some of these mills were driven by waterwheels, although most were steam powered. The largest logging operation by far was that of Brookings Lumber & Box Company. Beginning in 1899, the company produced 10-12 board feet of lumber annually on 8,000 acres in the Running Springs area. It built a logging railroad from Heaps Peak to Green Valley Lake to bring logs to its mill at Fredalba. sawmill at Fredalba. The drying yard is at left, and the mill pond is at right (out of the photo). Prospectors William F. Holcomb and Ben Choteau's 1860 discovery of gold on Holcomb Creek kicked off a flood of gold seekers to the San Bernardino Mountains. Mining boomtowns, including Belleville, Clapboard Town, Union Town, Bairdstown and Doble, were established almost overnight. Originally proposed in 1891 by the Arrowhead Reservoir and Power Company – and reportedly inspired by the success of the Big Bear Lake project – Lake Arrowhead was to be one of a series of three reservoirs that would divert water draining off the northwestern San Bernardino Mountains into the San Bernardino Valley, and furnish water to a 260 kW hydroelectric plant. Although the project was never completed to full extent, Arrowhead became one of the most popular fishing destinations in Southern California. In the early 20th century, John Baylis built the Pinecrest Resort on Lake Arrowhead. This was followed by several other tourist developments, including the Skyland Inn and Thousand Pines Camp. Most early tourists arrived by stagecoach, though in time the old Mormon logging road through Waterman Canyon was overhauled, allowing for the passage of automobiles. Development of resorts also proliferated on rivers and high mountain valleys. The Seven Oaks Camp was established on the banks of the Santa Ana River in 1890, and resorts also grew up at Crestline and Running Springs in higher regions of the San Bernardino Mountains. Snow in the San Bernardinos was seen as an obstacle before the 1920s and practically shut down recreation in the winter. However, more and more Southern Californians braved the dangers of winter travel in the mountains, and Lake Arrowhead became a sought-after winter destination by the 1930s. Skiing did not become a popular recreational activity in the mountains until a simple sling lift was built at Big Bear in 1938. By 1949, a chair lift was built, hugely increasing the amount of skiers the area's resorts could accommodate. Known as the Lynn Lift, it operated until 1970, but was demolished in 1981 due to its limited capacity. Tommi Tyndall, who founded ski schools at Big Bear, Mill Creek, Snow Summit and Sugarloaf Mountain, is widely credited for introducing and later advocating the sport in the San Bernardino Mountains, as well as for bringing snowmaking technology, without which the present-day ski industry would be severely crippled during dry winters. ==Infrastructure==
Infrastructure
Transportation During the early 20th century, the roads that serviced the San Bernardino Mountains were steep and narrow. Conflicts occurred between those who believed that the automobile could provide fast and cheap transportation up the steep grades of the mountains, and those who worried that cars were dangerous and would cause accidents with the stagecoaches then in use. In 1908, W.C. Vaughan drove up the Waterman Canyon road to Lake Arrowhead in protest of county restrictions, with police in hot pursuit. In spite of a total ban on automobiles imposed by the county the following year, Jack Heyser took a car down the narrow stage roads around modern-day Crestline in 1910, proving that the mountains could be safely serviced by automobiles. in Santa Ana Canyon, with Sugarloaf Mountain rising in the distance By 1911, cars had largely replaced horse-drawn carts as the primary mode of transport in the mountains, and new toll roads were constructed through the range to service them. Among the first were roads through Cajon Pass, City Creek Canyon (SR 330), and Mill Creek and Santa Ana Canyons (SR 38). The largest and most famous road through the San Bernardinos – California State Route 18, more popularly known as the Rim of the World Highway for as it winds through the mountains – was dedicated on July 18, 1915. Water management In the late 1950s, work began on the California Aqueduct, a massive system of canals and pipelines designed to bring water from Northern California to growing cities in the parched south. The East Branch of the aqueduct passes over the San Bernardino Mountains through a complex arrangement of pumping stations, reservoirs and power stations. The aqueduct feeds Silverwood Lake, a large reservoir created by the construction of a dam on the northern flank of the San Bernardinos in 1973. From Silverwood, the water passes through the mountains via the San Bernardino Tunnel, and drops down to the Devil Canyon Power Plant in the San Bernardino Valley, using the enormous hydraulic head afforded by the mountains to generate up to 276 MW of power. Completed in 1999, the dam is designed to completely contain a 350-year flood. Many other dams, including Mojave Forks Dam on the Mojave River and various retention basins and check dams on smaller drainages, provide more localized flood and sediment control.{{cite web ==Ecology and wildlife==
Ecology and wildlife
The San Bernardino Mountains, along with the nearby San Gabriel and San Jacinto ranges, is considered a sky island – a high mountain region whose plants and animals vary dramatically from those in the surrounding semi-arid lands. The San Bernardinos in particular comprise the largest forested region in Southern California, and support some 1,600 species of plants. Foothill regions are primarily composed of chaparral and evergreen oak woodland communities, with a transition to forests of deciduous oak, yellow pine, Jeffrey pine, incense cedar and several fir species at elevations above . Deeper within the mountains, perennial streams fed by springs and lakes nourish stands of alders, willows and cottonwoods. The mountains once had an abundant population of California grizzly, but hunting eliminated their populations by 1906. Black bears roam the highlands today, but they are not native to the region: they were imported from the Sierra Nevada by the California Department of Fish and Game in the 1930s, in part to attract tourists to the mountains. ==See also==
Works cited
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