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66-524: The Santiago Creek watershed covers about 100.6 square miles (261 km) in northern Orange County. The upper part of the creek is free-flowing, while the lower section is urbanized and includes parts of the cities of Tustin , Orange , and Santa Ana . Below the Villa Park Dam the creek is mostly channelized and flows only during heavy winter storms. Historically the Santiago Creek provided water for

132-417: A golf course , then after flowing through another narrow canyon, receives an unnamed tributary from the left, 10.5 miles (16.9 km) from the mouth. It then bends slightly to flow southwest and enters a culvert under Marguerite Parkway, emptying into another golf course, 8 miles (13 km) from the mouth. The creek then crosses under Interstate 5 and flows between the highway and Camino Capistrano through

198-504: A "nuisance flow". This dry-season flow, which has an average minimum of 1 cubic foot per second (0.03 m /s), has created erosion problems in the few unlined reaches of the creek, as the creek is mostly channelized. A structure exists on Oso Creek that is designed to divert a portion of the flow into the Galivan Basin depending on the specific level of a high inflow. Amounts diverted include 350 cubic feet per second (10 m /s) during

264-407: A Tongva village, massacred the native residents, and took the remaining horses. Though some managed to escape, many Indians were killed in the massacre. The village's site is designated as California Historical Landmark #217. In 1877, two prospectors, Hank Smith and William Curry, discovered silver in present-day Silverado Canyon. Several mines immediately sprang up in the area, the largest of which

330-585: A diet of primarily acorns , using the ground acorn powder to form a type of porridge known as atole . They ground the acorns in stone mortars carved into large boulders and rock formations, with some remaining in the creek's canyon areas. In 1769 the Spanish Portolá expedition , first European land exploration of Alta California , traveled northwest along the southern edge of the Santa Ana Mountains . They camped near where Santiago Creek emerges from

396-510: A flow of 4,000 cubic feet per second (110 m /s), and 4,800 cubic feet per second (140 m /s) during a flow of 29,000 cubic feet per second (820 m /s). In 1991, the continuing erosion along Oso Creek, due to upstream development, had carved a 50-foot (15 m) deep canyon from a creek channel that originally "was about 6 feet deep and 6 feet wide". The canyon was threatening to swallow large portions of citrus groves. It begins less than 1 mile (1.6 km) downstream of

462-405: A pipeline and flume to Peters Canyon Reservoir. Because the flume diverts the creek's entire flow, the creek below the dam is dry except during floods. Below the dam the dry riverbed meets Fremont Canyon, a right bank tributary, and crosses underneath California State Route 241 . It then flows northwest, bisecting Irvine Regional Park , and receives Weir Canyon Creek from the right. Near Villa Park,

528-410: A rich riparian community along its shores. The Santa Ana Mountains supported a large population of California grizzly bear , now extinct, and other large mammals such as mountain lions , bobcats , and coyotes . Today, the upper Santiago Creek remains much in its natural state, while the lower creek is listed as highly disturbed and no longer supports much native vegetation and wildlife. Historically,

594-454: A series of freshwater marshes. The La Paz Channel, its largest tributary, joins here on the right. It passes the Galivan Basin, which functions to capture floodwaters from Oso Creek, on the right bank, and receives from the right a second unnamed tributary, 7.5 miles (12.1 km) from the mouth. This tributary actually flows through the Galivan Basin before meeting Oso Creek. The creek then bends southwest around several shopping centers near

660-611: A wide variety of birds, amphibians , fish, insects, and mammals. Most of the creek originally lay in the territory of the Acjachemen and the Tongva peoples, two large Native American groups of present-day Orange, Los Angeles, and San Diego Counties. The Acjachemen lived to the south, and the Tongva to the north, of the southwest-running Aliso Creek that flows to the Pacific in an area southeast of

726-509: Is channelized and polluted along much of its length. "Oso", meaning bear in the Spanish language , was likely the name given to the creek by Spanish conquistadors . Up to the 1970s, the Oso Creek watershed was mostly undeveloped and the creek ephemeral . The watershed lies close to two major wilderness areas - Aliso and Wood Canyons Wilderness Park to the southwest and O'Neill Regional Park to

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792-700: Is composed of rocks from the pre- Triassic to the Quaternary (251–2.6 MYA). These rocks consist primarily of slate , sandstone , conglomerate , limestone , and other sedimentary rocks . The uplift of the Santa Ana Mountains began approximately 5.5 million years ago along the Elsinore Fault Zone, which extends north from near its namesake Lake Elsinore area. Before the latter 19th century, Santiago Creek and its tributaries were free flowing perennial streams spilling out of Santa Ana Mountains canyons onto

858-566: Is in the 37th Senate District , represented by Democrat Dave Min and in the 73rd Assembly District , represented by Democrat Cottie Petrie-Norris . In the United States House of Representatives , Tustin is in California's 40th congressional district , represented by Republican Young Kim . Primary and secondary education in Tustin and surrounding unincorporated areas

924-633: Is located in the city of Tustin. The Tustin Police Department is the local law enforcement agency of the city. The department's jurisdiction includes the entire 11.12 square miles (29 km ) of the city of Tustin, as well as the Tustin Legacy development. Founded in 1928, the Tustin Police Department started with one officer, John Stanton, as "street superintendent", which changed to "chief of police" two months later. Chief Stanton

990-606: Is overseen by the Tustin Unified School District . Tustin High School is a California Distinguished School , as is Foothill High School . Arnold O. Beckman High School is in the Best High Schools according to U.S. News & World Report . Tustin High School is also well-known regionally for its strong Model United Nations program. Springfield College, a non-profit, private, higher education institute,

1056-436: Is the longest, while Silverado Canyon is by area the largest. The largest sub-tributary watershed is Ladd Canyon, a tributary of Silverado Canyon. Many of the upper tributaries are spring-fed and perennial. An uppercase R stands for right bank, and L is for left bank. The dominant geological feature in the Santiago Creek watershed are the Santa Ana Mountains. The northern portion of the mountains, which Santiago Creek drains,

1122-657: The Interstate 5 / California State Route 73 interchange, where Oso Creek spills out of its concrete channel onto bare ground, and continues downstream to where the creek meets Trabuco Creek. In early 1993, severe storm erosion damage along Oso Creek threatened sewer lines and a church. On 15 March 2000, 21,000 U.S. gallons (80 m ) overflowed into Oso Creek from a broken sewage pipeline in Mission Viejo. The USGS operated one stream gauge for ten years from 1971 to 1981 near Mission Viejo, California , specifically near

1188-653: The Irvine Company and the Carpenter Irrigation District of El Modena , for the construction of Santiago Dam, impounding Lake Irvine . Construction work begun in 1929 and the dam was completed in 1931. The agricultural areas in the creek's lower watershed were replaced by residential and commercial development in the Post-WWII era, but the city of Villa Park and some of the city of Orange still receive their water from Irvine Lake. The Villa Park Dam, forming

1254-479: The National Register of Historic Places and ASCE List of Historic Civil Engineering Landmarks . The north hangar burned down in 2023. Suburban growth after the war resulted in increased population, annexation of nearby unincorporated land, including the former Marine Corps Air Station , and development of orchards and farmland into housing tracts and shopping centers. According to the U.S. Census Bureau ,

1320-591: The Rancho Santiago de Santa Ana . After the Mexican–American War , Alta California became part of the United States and American settlers arrived in this area. Columbus Tustin, a carriage maker from Northern California, founded the city in 1868 on 1,300 acres (5.3 km ) of land from the former Rancho Santiago de Santa Ana . The city was incorporated in 1927 with a population of about 900. The townsite

1386-522: The Santa Ana Mountains border it to the north and northeast. The drainage divide between Oso Creek and the Aliso Creek watershed is quite pronounced, connecting the San Joaquin Hills to the Santa Ana Mountains in a northeasterly direction. The creek was formerly ephemeral , but significant amounts of urban runoff that flow uncontrolled into the creek have created a perennial flow, known also as

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1452-574: The Tongva people , whose territory extended over much of northern present-day Orange County and into the Los Angeles Basin . Native Americans have inhabited the Santiago Creek and Santa Ana River watershed for up to 12,000 years. The creek was named by the Spanish Gaspar de Portolá expedition of 1769, which crossed the Santa Ana River near where it meets the Santiago Creek. In the 1870s there

1518-559: The U.S. state of California . Draining about 20 square miles (52 km ) in a region north of the San Joaquin Hills and south of the Santa Ana Mountains , the creek is Trabuco Creek's largest tributary, and is part of the San Juan Creek drainage basin . Beginning in the foothills of the Santa Ana Mountains near the city of Mission Viejo , the creek is dammed twice to form Upper Oso Reservoir and Lake Mission Viejo . The creek

1584-439: The Villa Park Dam forms a flood control reservoir to control spills from Irvine Lake. Below Villa Park, the creek is confined to a flood control channel for the remaining 7 miles (11 km) of its course. Flowing roughly southwest between the cities of Orange and Santa Ana , it receives Handy Creek from the left, then crosses under California State Route 55 and 22 , through Hart Memorial Park and Santiago Creek Park. Because

1650-665: The unincorporated community of North Tustin . On November 1, 1776, Mission San Juan Capistrano became the area's first permanent European settlement in Alta California , New Spain . In 1801, the Spanish Empire granted 62,500 acres (253 km ) to José Antonio Yorba , which he named Rancho San Antonio. Yorba's great rancho included the lands where the cities and communities of Olive , Orange , Villa Park , Santa Ana , Tustin, Costa Mesa and Newport Beach stand today. Smaller ranchos evolved from this large rancho including

1716-574: The 1790s. He built an adobe house beside Santiago Creek in 1796. Later settlers included the Peraltas and Sepúlvedas . Three adjoining ranchos were granted within the creek's drainage. The Spanish era Rancho Santiago de Santa Ana (1810), extending from the Santa Ana River to the Santa Ana Mountains, was 25-mile (40 km)-long, 2.5-to-6.5-mile (4.0 to 10.5 km). The later Mexican era land grants were Rancho San Joaquin (1837) and Rancho Lomas de Santiago (1846). Portions of all later became part of

1782-735: The 1940s. The mine has continued to issue small amounts of toxic tailings, including arsenic , cadmium , lead , and mercury , remediation for which the Trabuco Ranger District of the Cleveland National Forest began toxic cleanup in 2008. In 1883 Polish actress Helena Modjeska purchased the Pleasant family's homestead ranch in Santiago Canyon near the mouth of Harding Creek, the Santiago's first large tributary. She commissioned

1848-636: The City Council as council members. Local politics in the late 1990s and early 2000s were dominated by the 1997 closure of the local Marine Corps Air Station and plans for the subsequent commercial development of the land, including an unsuccessful bid by neighboring Santa Ana to build a school on the land, part of which is within Santa Ana Unified School District's territory. In the California State Legislature , Tustin

1914-470: The Crown Valley Parkway crossing, approximately 5 miles (8.0 km) above the confluence with Trabuco Creek and in total 8 miles (13 km) above where the water joins San Juan. This gauge recorded an average annual flow of 5.3 cubic feet per second (0.15 m /s), or 3,800 acre⋅ft (4,700,000 m ) per year, with most of the flow occurring between December and March. The highest peak flow

1980-599: The Irvine Ranch. A well-known massacre of Native Americans occurred in 1831, in present-day Black Star Canyon , which was called Cañada de los Indios (Indian Canyon) in Spanish. The retaliation was one in a series against local Tongva ( Gabrielino ) Native Americans taking horses from the Mexican ranchos. A party of American fur trappers set out to retrieve stolen horses. They followed hoofprints into Cañada de los Indios, came upon

2046-425: The Santa Ana Mountains. The creek runs south-southwest toward Portola Hills before turning northwest. Once out of the national forest it passes through the town of Modjeska and meets the first major tributary, Harding Canyon Creek, from the right. Downstream, it receives Baker and Silverado creeks, both from the right. Past the first Santiago Canyon Road crossing, the gorge widens to a broad alluvial plain , where

Santiago Creek - Misplaced Pages Continue

2112-798: The Santa Ana River confluence. Although only tiny parts of the Santiago Creek watershed do not lie within Orange County, it closely borders Riverside and San Bernardino counties. The Santa Ana Mountains rise higher on the right bank of the creek (the north bank) than on the left (south) bank, and parts of the northernmost course of the creek run through the Puente Hills . The major tributary watersheds, in order of their appearance from southeast to northwest (roughly in downstream order) are: Harding Canyon, Williams Canyon , Silverado Canyon, Ladd Canyon (tributary of Silverado Canyon), Baker Canyon, Black Star Canyon , Fremont Canyon, Blind Canyon, and Weir Canyon on

2178-462: The Santiago Creek watershed. An Acjachemen-Tongva boundary terminated at the Aliso Creek headwaters, but it is uncertain where the boundary was that divided Santiago Creek within the native territories. Archaeological evidence suggests that the upper portions of the creek were settled by Native Americans, and some historical accounts including those of the Spanish settlers, mention the Acjachemen lived in

2244-809: The Villa Park Reservoir further downstream on Santiago Creek, was completed in 1963 also by the Serrano Irrigation District, which by that time, had changed its name to the Serrano Water District. The lower course of Santiago Creek ended up being channelized in the mid-20th century after the passage of the Orange County Flood Control Act of 1927. The dam is now owned by the Orange County Flood Control Division. Historically, Santiago Creek supported

2310-438: The broad, alluvial floodplain . The creek wound on the plain for the rest of its course to its confluence with the Santa Ana River. coast live oaks ( Quercus agrifolia ), California sycamores ( Platanus racemosa ), white alders ( Alnus rhombifolia ), native willows ( Salix species), and other riparian habitat vegetation lined the route of the creek and its primary tributaries. The creek and adjacent habitats supported

2376-542: The canyon above the town of Modjeska to the summit of Modjeska Peak. Other parks, nature reserves, recreational areas, and historic sites within the Santiago Creek area include: From mouth to source: Tustin, California Tustin is a city located in Orange County, California , United States, within the Los Angeles metropolitan area . In 2020, Tustin had a population of 80,276. The city does not include

2442-556: The canyon of upper Santiago Creek. These first inhabitants of the Santiago Creek Canyon lived in semi-permanent villages close to running water. The upper canyon was in the Acjachemen homelands, while the lower (northwestern) part of the watershed, likely downstream of present-day Irvine Lake , was in the Tongva homelands. The Native Americans had been drawn to the area by the abundant riparian zone found along Santiago Creek and some of its perennial tributaries. They subsisted on

2508-425: The cities of Mission Viejo , Laguna Niguel , and San Juan Capistrano . Most of the watershed is used for residential, commercial, and agricultural purposes. Oso Creek runs parallel to Trabuco Creek, while Salt Creek is to the southwest, Sulphur Creek to the west, and Aliso Creek to the northwest. The southernmost portions of the San Joaquin Hills lie to the west and southwest of the Oso Creek watershed, and

2574-412: The city has a total area of 11.1 square miles (28.7 km ). It is bordered by Irvine on the south and east, Orange and the unincorporated community North Tustin on the north, and Santa Ana on the west. The city is sometimes referred to as "The City of Trees". Sycamores and oaks , native to the area, grew in abundance at the time of the founding of the city, and city founder Columbus Tustin

2640-439: The convergence of Interstate 5 and California State Route 73 , within the city limits of Laguna Niguel . Near this area, Oso Creek enters a concrete flood control channel with sloping sides, 5 miles (8.0 km) from the mouth. It then flows through a riprap lined channel before entering a concrete box culvert, which runs south under the state route. The creek then spills out into a natural channel, 1.2 miles (1.9 km) from

2706-584: The creek is dry most of the year, portions of the river bed are used as parking lots when conditions permit. The creek then crosses under Interstate 5 and continues west toward the Santa Ana River. Its confluence is on the river's left bank, inside the Riverview Golf Course. About 10 miles (16 km) below the confluence with Santiago Creek, the Santa Ana River enters the Pacific Ocean at Huntington Beach . The Santiago Creek watershed occupies much of

Santiago Creek - Misplaced Pages Continue

2772-763: The creek is known to have sustained a population of steelhead trout (Oncorhynchus mykiss) , but with the construction of Villa Park and Santiago Creek dams, their anadromous spawning runs from the sea have been destroyed. However, 13 specimens of the land-locked form of steelhead, rainbow trout, were fin-sampled recently from Harding Canyon and genetic analysis has shown them to be of native and not hatchery stocks. Historically, at least two tributaries to Santiago Creek, Silverado and Harding Canyons, also supported steelhead. The watershed now primarily supports introduced fish in Lake Irvine. Recreation along Santiago Creek, in its watershed, and at its reservoirs includes: Lake Irvine

2838-535: The creek. The Spanish left accounts mentioning the Juaneño , the name given to the Acjachemen by the Spanish missionaries after the founding of Mission San Juan Capistrano , located to the southeast at the confluence of San Juan and Trabuco Creeks . One of the first settlers in the Santiago Creek watershed was Jose Pablo Grijalva, a former Spanish soldier, who arrived in 1784. He and his son-in-law, José Antonio Yorba , began grazing cattle in Santiago Creek Canyon in

2904-531: The entire 2,400-square-mile (6,200 km) Santa Ana River watershed - but makes up about 65.7% of the 153.2 square miles (397 km) of Santa Ana River watershed within Orange County, and 10.6% of 948-square-mile (2,460 km) Orange County. Most of the watershed is unincorporated, but about a third lies within Anaheim , Villa Park , Orange , and Santa Ana . Elevations in the watershed range from 5,687 feet (1,733 m) at Santiago Peak to 108 feet (33 m) at

2970-607: The federal poverty line. According to the city's 2020 Comprehensive Annual Financial Report, the top employers in the city are: The Tustin City Council is composed of five members elected at large; the mayorship rotates among the council members and is primarily a ceremonial role. Mayor Allan Bernstein was elected to the Tustin City Council in 2012. In 2019, Letitia Clark was chosen to serve as mayor pro tem , Charles E. "Chuck" Puckett, Barry Cooper and Austin Lumbard are also on

3036-459: The mountains on July 27 , and near the Santa Ana River on July 28. Padre Juan Crespi noted in his diary that the creek was named for the Apostle Santiago el Mayor ". Later Spaniards named the creek's canyon Cañada de Madera (timber canyon). The mountain whose southwestern flank is the creek's headwaters , known as Kalawpa by the indigenous peoples , was renamed Santiago Peak , after

3102-570: The mouth, which it has incised to depths of 50 feet (15 m) or more, as the interstate bends southeast. Flowing through an agricultural area, the creek bends east to join Trabuco Creek inside San Juan Capistrano . Occupying the west and northwest portions of the San Juan Creek watershed, the 25-square-mile (65 km ) Oso Creek watershed comprises about 18% of the 133-square-mile (340 km ) San Juan Creek watershed. It includes parts of

3168-529: The northwestern end of the Santa Ana Mountains, and is located generally north of the city of Irvine . It is bounded on the south by the San Diego Creek , Aliso Creek and Oso Creek drainage areas, on the southeast by the Trabuco Creek watershed, and on the north and west by tributaries of the Santa Ana River. At 100.6 square miles (261 km) in size, the Santiago Creek watershed makes up about 3.6% of

3234-417: The occupied units, 12,813 (50.8%) were owner-occupied and 12,390 (49.2%) were rented. The homeowner vacancy rate was 1.3%; the rental vacancy rate was 5.8%. 36,783 people (48.7% of the population) lived in owner-occupied housing units and 38,237 people (50.6%) lived in rental housing units. According to the 2010 census, Tustin had a median household income of $ 74,011, with 12.2% of the population living below

3300-635: The population) lived in households, 340 (0.5%) lived in non-institutionalized group quarters and 180 (0.2%) were institutionalized. There were 25,203 households, of which 10,465 (41.5%) had children under the age of 18 living in them, 12,969 (51.5%) were opposite-sex married couples living together, 3,494 (13.9%) had a female householder with no husband present, 1,472 (5.8%) had a male householder with no wife present. There were 1,568 (6.2%) unmarried opposite-sex partnerships and 193 (0.8%) same-sex married couples or partnerships . 5,178 households (20.5%) were one person and 1,403 (5.6%) had someone living alone who

3366-459: The renowned New York architect Stanford White to design a country manor house , expanding the Pleasant's house into the landmark Modjeska House in the Arden gardens, within present-day Modjeska Canyon . She lived on the Arden estate, between her European and American theatre season tours, until 1906, and died in 1909. Modjeska Peak , rising 5,496 feet (1,675 m) above Santiago Creek's headwaters,

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3432-426: The reservoir, Oso Creek crosses under California State Route 241 and for the next mile (1.6 km) of its course, it flows through a narrow riparian corridor surrounded by residential areas in the city of Mission Viejo. The creek enters an underground culvert , bends east and south, and enters Lake Mission Viejo , 12 miles (19 km) from the mouth. Downstream of the artificial lake, Oso Creek flows through

3498-508: The right bank; and Limestone Canyon and Handy Creek on the left bank. Of the right bank tributaries, the Silverado Canyon, Ladd Canyon and Fremont Canyon sub-watersheds each extend a little into Riverside County. The Silverado/Ladd Canyon subwatershed is the largest, and Williams Canyon is the smallest. Santiago Creek has 10 major tributaries along its course, most of which come in while the creek flows through Santiago Canyon. Fremont Canyon

3564-501: The valley walls pull away and decrease in height. The creek's perennial surface flows are limited to this upper stretch; below here the water flows underground except during the wet season of winter and early spring. The creek then empties into Irvine Lake, which is also fed by Limestone Canyon, a left-bank tributary. The 700-acre (280 ha) reservoir is formed by the 110-foot (34 m) Santiago Dam , located at its north end. Irvine Lake provides water to Villa Park and Orange via

3630-431: The west, on Trabuco Creek - but has no major parks within its boundaries. Interstate 5 parallels the creek for over half of its length. The original headwaters of Oso Creek were in a small canyon in the south-central part of the Santa Ana Mountains. A dam was built across this canyon, flooding it to create Upper Oso Reservoir , which now forms the headwaters of the creek, fed by three small seasonal streams. After leaving

3696-469: Was 5,150 cubic feet per second (146 m /s) on 16 February 1980, with a gauge height of 7.6 feet (2.3 m). The second highest flow was the preceding year, which saw a flow of 2,445 cubic feet per second (69.2 m /s). The Oso Creek Trail follows the creek for a notable portion of its length, and is said to be the "backbone" of the trail system of the City of Mission Viejo . The paved trail mostly follows

3762-575: Was 65 or older. The average household size was 2.98. There were 17,935 families (71.2% of households) and the average family size was 3.46. The age distribution was 20,212 people (26.8%) under the age of 18, 6,856 (9.1%) aged 18 to 24, 25,033 (33.1%) aged 25 to 44, 17,006 (22.5%) aged 45 to 64, and 6,433 (8.5%) who were 65 or older. The median age was 33.4 years. For every 100 females, there were 94.7 males. For every 100 females age 18 and over, there were 91.6 males. There were 26,476 housing units at an average density of 2,389.2 per square mile (922.5/km ). Of

3828-468: Was a short-lived silver boom along the tributary Silverado Creek . In 1929 the Santiago Dam was built to form Irvine Lake , to supply irrigation water. Pipelines from Irvine Lake still contribute a small amount of water to the municipality of Villa Park . Santiago Creek rises in the Cleveland National Forest , between Santiago Peak and Modjeska Peak , which together form the prominent Saddleback of

3894-491: Was bordered by Camino Real on the south, Newport Avenue on the east, 1st Street on the north, and Route 43, now known as the Costa Mesa Freeway , on the west. During World War II , a Navy anti-submarine airship base (later to become a Marine Corps helicopter station) was established on unincorporated land south of the city; the two dirigible hangars are among the largest wooden structures ever built and are listed on

3960-425: Was created officially on October 5 of that year as "Orange County Park", and originally it consisted of 160 acres (0.65 km) of woodland along the riparian course of Santiago Creek. At first, Santiago Creek flowed freely through the park, but with the completion of Santiago Dam in 1931, that was no longer possible. A boating pond constructed in 1913 then had to be filled with water piped in from Lake Irvine. The park

4026-570: Was expanded to its current size of 477 acres (1.93 km) in 1971, and has hiking, fishing, boating, and a small zoo. The upper Santiago Creek watershed lies within the Trabuco Ranger District of the Cleveland National Forest . The Cleveland National Forest was created in 1908, and expanded to 424,000 acres (1,720 km) by 1925. Several hiking trails run up the steep canyons in the upper Santiago Creek watershed, leading up tributaries such as Black Star Canyon and Silverado Canyon. The Joplin Trail leads up

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4092-480: Was known as the Blue Light Mine. During this period, the town of Silverado rose at the confluence of Silverado Creek and Santiago Creek and the boom continued for over three years. Although the height of the mining was in the three or four years following the discovery of silver, smaller-scale mining continued for decades after the initial boom had ended. The last commercial operations at the Blue Light Mine ceased in

4158-475: Was named in her honor. By the 1920s, the Orange/Anaheim/Villa Park area was a prospering agricultural region that depended on water from the Santa Ana River and Santiago Creek. Santiago Creek would unleash seasonal floods in the winter and then while becoming a trickle or completely dry in the summer, making irrigation difficult. The Serrano Irrigation District was formed in 1928, and partnered with

4224-429: Was opened for fishing in 1941. A fishing license is not required to catch fish at the 700-acre (2.8 km) reservoir. The lake was stocked with fish in the 1930s beginning with largemouth bass , catfish , and panfish . The lake is still stocked weekly with fish. Irvine Regional Park, created in 1897, now occupies much of the lowermost Santiago Creek Canyon, between Santiago Creek Dam and Villa Park Reservoir. The park

4290-680: Was responsible for planting many more along the streets of the city. Tustin has a Mediterranean climate ( Köppen climate classification Csa ). The 2020 United States census reported that Tustin had a population of 79,430. The population density was 6,816.7 per square mile (2,631.9/km ). The racial makeup was 39,729 (52.6%) White (34.8% Non-Hispanic White), 1,722 (2.3%) African American, 442 (0.6%) Native American, 15,299 (20.3%) Asian, 268 (0.4%) Pacific Islander, 14,499 (19.2%) from other races, and 3,581 (4.7%) from two or more races. There were 30,024 people of Hispanic or Latino origin, of any race (39.7%). The census reported that 75,020 people (99.3% of

4356-543: Was the only Tustin officer until 1942. At the time of his appointment, there were no police headquarters or stations, and he took calls from his home. The Tustin Police Department had roughly three officers in 1948, twenty years after its founding. Fire protection in Tustin is provided by the Orange County Fire Authority . Oso Creek Oso Creek is an approximately 13.5-mile (21.7 km) tributary of Arroyo Trabuco in southern Orange County in

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