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The Santa Ana Valley is located in Orange County, California and is bisected by the Santa Ana River. The valley is home to most of Orange County's central business districts. The cities of Anaheim, Buena Park, Costa Mesa, Fullerton, Irvine, Orange, Placentia, Santa Ana, and Yorba Linda are located in the Santa Ana Valley.
This valley was named Vallejo de Santa Ana in 1769 after the Gaspar de Portolà expedition, of which Friar Junípero Serra was a part, as well as Sargeant José Antonio Yorba, and José Manuel Nieto. The mission located closest to the Santa Ana Valley is Mission San Juan Capistrano, which was built east of the San Joaquin Hills, in the present day city of San Juan Capistrano.
The historic Ranchos of California in the Santa Ana Valley area:
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Orange County is located in the Los Angeles metropolitan area in Southern California. As of the 2020 census, the population was 3,186,989, making it the third-most-populous county in California, the sixth-most-populous in the United States, and more populous than 19 American states and Washington, D.C. Although largely suburban, it is the second-most-densely-populated county in the state behind San Francisco County. The county's three most-populous cities are Anaheim, Santa Ana, and Irvine, each of which has a population exceeding 300,000. Santa Ana is also the county seat. Six cities in Orange County are on the Pacific coast: Seal Beach, Huntington Beach, Newport Beach, Laguna Beach, Dana Point, and San Clemente.
Santa Ana is the county seat of Orange County, California. Located in the Greater Los Angeles region of Southern California, the city's population was 310,227 at the 2020 census, making Santa Ana the second most populous city in Orange County, the 13th-most populous city in California and the 4th densest large city in the United States. Santa Ana is a major regional economic and cultural hub for the Orange Coast.
The Chino Hills are a mountain range on the border of Orange, Los Angeles, and San Bernardino counties, California, with a small portion in Riverside County. The Chino Hills State Park preserves open space and habitat in them.
Olive is an unincorporated parcel of about 32.67 acres (132,200 m2) in the city of Orange, located along Lincoln Avenue, between Eisenhower Park and Orange Olive Road.
José Antonio Yorba, also known as Don José Antonio Yorba I, was a Spanish soldier and early settler of Spanish California.
The Diego Sepúlveda Adobe is an adobe structure in Costa Mesa, Orange County, California.
San Juan Creek, also called the San Juan River, is a 29-mile (47 km) long stream in Orange and Riverside Counties, draining a watershed of 133.9 square miles (347 km2). Its mainstem begins in the southern Santa Ana Mountains in the Cleveland National Forest. It winds west and south through San Juan Canyon, and is joined by Arroyo Trabuco as it passes through San Juan Capistrano. It flows into the Pacific Ocean at Doheny State Beach. San Juan Canyon provides a major part of the route for California State Route 74.
Rancho Santiago de Santa Ana was a 63,414-acre (256.63 km2) Spanish land concession in present-day Orange County, California, given by Spanish Alta California Governor José Joaquín de Arrillaga in 1810 to Jose Antonio Yorba and his nephew Pablo Peralta. The grant extended eastward from the Santa Ana River to the Santa Ana Mountains, with a length of more than 22 miles (35 km).
Rancho Cañón de Santa Ana was a 13,328-acre (53.94 km2) land grant in present-day Orange County, California given by Mexican governor José Figueroa in 1834 to Bernardo Yorba. The name means "Canyon of Santa Ana". The grant included present-day Yorba Linda.
Arroyo Trabuco is a 22-mile (35 km)-long stream in coastal southern California in the United States. Rising in a rugged canyon in the Santa Ana Mountains of Orange County, the creek flows west and southwest before emptying into San Juan Creek in the city of San Juan Capistrano. Arroyo Trabuco's watershed drains 54 square miles (140 km2) of hilly, semi-arid land and lies mostly in Orange County, with a small portion extending northward into Riverside County. The lower section of the creek flows through three incorporated cities and is moderately polluted by urban and agricultural runoff.
Bernardo Yorba, was a prominent Californio landowner, public figure, and one of the wealthiest men in early 19th-century California. Yorba also served as alcalde (mayor) of Santa Ana. The city of Yorba Linda is named after him.
Santiago Creek is a major watercourse in Orange County in the U.S. state of California. About 34 miles (55 km) long, it drains most of the northern Santa Ana Mountains and is a tributary to the Santa Ana River. It is one of the longest watercourses entirely within the county. The creek shares its name with Santiago Peak, at 5,687 ft (1,733 m) the highest point in Orange County, on whose slopes its headwaters rise.
San Diego Creek is a 16-mile (26 km) urban waterway flowing into Upper Newport Bay in Orange County, California in the United States. Its watershed covers 112.2 square miles (291 km2) in parts of eight cities, including Irvine, Tustin, and Costa Mesa. From its headwaters in Laguna Woods the creek flows northwest to its confluence with Peters Canyon Wash, where it turns abruptly southwest towards the bay. Most of the creek has been converted to a concrete flood control channel, but it also provides important aquatic and riparian habitat along its course and its tidal estuary.
Rancho Lomas de Santiago was a 47,227-acre (191 km2) Mexican land grant given by Mexican Governor Pío Pico to Teodosio Yorba in 1846. The name means "Hills of St. James". The rancho included parts of present-day Irvine and Tustin in what is now eastern Orange County, California.
Rancho La Sierra was a 17,769-acre (71.91 km2) Mexican land grant in present-day Riverside County, California, United States. In 1846 governor Pio Pico issued the grant to Bernardo Yorba. The grant lay between Rancho Jurupa and Rancho El Rincon, and included the present-day city of Corona.
Rancho Boca de la Playa was a 6,607-acre (26.74 km2) Mexican land grant in present-day Orange County, California given in 1846 by Governor Pío Pico to Emigdio Véjar. The name refers to the wetlands estuary at the 'mouth of the beach,' or 'boca de la playa' in Spanish. This is the most southerly grant in Orange County, and extended along the Pacific coast from San Juan Creek in the south of present-day San Juan Capistrano south to San Clemente.
Santiago Argüello (1791–1862) was a Californio, a soldier in the Spanish army of the Viceroyalty of New Spain in Las Californias, a major Mexican land grant ranchos owner, and part of an influential family in Mexican Alta California and post-statehood California.
The Sepúlveda family is a prominent Californio family of Southern California. Members of the family held extensive rancho grants and numerous important positions, including Alcalde de Los Ángeles, California State Assemblymen, and Los Angeles County Supervisor.
