dbo:abstract
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- Aliso Creek is a 19.8-mile (31.9 km)-long, mostly urban stream in south Orange County, California. Originating in the Cleveland National Forest in the Santa Ana Mountains, it flows generally southwest and empties into the Pacific Ocean at Laguna Beach. The creek's watershed drains 34.9 square miles (90 km2), and it is joined by seven main tributaries. As of 2018, the watershed had a population of 144,000 divided among seven incorporated cities. Aliso Creek flows over highly erosive marine sedimentary rock of late Eocene to Pliocene age. What would become the Aliso Creek watershed originally lay at the bottom of the Pacific Ocean, before being uplifted as recently as 10 million years ago. About 1.2 million years ago, the San Joaquin Hills began to uplift in the path of Aliso Creek. Occasionally swollen by wetter climates during glacial periods, the creek carved the deep water gap known today as Aliso Canyon, the main feature of Aliso and Wood Canyons Wilderness Park. Historically, Aliso Creek served as the boundary between the Acjachemem (Juaneño) and Tongva (Gabrieleño) Native Americans. Spanish explorers and missionaries reached the area in the 1700s and established Mission San Juan Capistrano, whose lands included part of the Aliso Creek watershed. In the 1840s the watershed was divided between several Mexican land grants. After California became part of the United States, the ranchos were gradually partitioned and sold off to farmers and settlers; starting in the 1950s, real estate companies acquired most of the land for development. By the 21st century, more than 70 percent of the Aliso Creek watershed was urbanized. Most of the creek's course has been channelized or otherwise impacted by development. Pollution and erosion from urban runoff have become chronic issues. However, parts of the creek remain free flowing and provide important regional wildlife habitat, especially in the Aliso Canyon section. The creek has recently been the focus of projects to restore the stream channel and improve water quality. (en)
- Aliso Creek (« ruisseau des aulnes » en espagnol, également appelé Alisos Creek en anglais) est un fleuve côtier long de 30,5 km (19 milles) situé dans le comté d'Orange dans l'État américain de Californie. Il prend sa source dans les monts Santa Ana et se jette dans l'océan Pacifique ; il est alimenté par sept affluents principaux. Le ruisseau est presque entièrement canalisé. En 2004, son bassin versant recouvrait une zone peuplée de 149 087 habitants répartis dans sept municipalités. Le fleuve s'écoule de manière à peu près rectiligne dans la direction sud-sud-ouest, empruntant un bassin côtier étroit situé à l'extrémité sud du bassin de Los Angeles. Comme la Californie du Sud était encore submergée dans l'océan Pacifique il y a 10 millions d'années, le cours d'eau coule sur des roches sédimentaires datant de la fin de l'Éocène au Pliocène. L'état actuel du bassin, avec ses vallées sédimentaires et ses canyons très érodés, est dû à un changement climatique advenu durant la dernière glaciation, qui a produit l'Aliso Canyon, les gorges finales du fleuve. Le fleuve doit son nom à des explorateurs espagnols du XVIIIe siècle ; c'est un hydronyme commun en Californie. Autrefois, le fleuve servait de frontière entre les peuples amérindiens Juaneño (Acjachemem) et (Tongva). Le fleuve et son bassin sont ensuite devenus la propriété de à l'issue du Mexican Land Grant de 1842, en tant que partie du rancho Ranguo Niguel, avant qu'ils ne soient achetés par deux éleveurs américains. À partir du XXe siècle ont lieu des tentatives d'utiliser le fleuve comme source d'approvisionnement municipal, mais le peu de qualité de l'eau et l'irrégularité du débit y mettent un terme. Négligé, le fleuve n'est guère utilisé fonctionnellement que comme collecteur d'eaux pluviales ; toutefois, malgré son déclin, il a longtemps conservé une part de sa biodiversité et a accueilli des activités de loisir. Depuis les années 1960, la pollution, les inondations et le développement périurbain ont dégradé la qualité de l'eau et de la faune vivant auprès du fleuve. La pollution est toujours actuellement le problème principal ; malgré de nombreuses études et plusieurs projets de réhabilitation, à l'instar des autres cours d'eau du comté d'Orange, peu d'actions concrètes ont été engagées. (fr)
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- Aliso Creek flows underneath the Aliso Creek Road bridge before it enters Aliso and Wood Canyons Wilderness Park. (en)
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- Map of the Aliso Creek watershed showing major tributaries and cities (en)
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dbp:mouth
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dbp:mouthLocation
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- Aliso Beach Park, Laguna Beach (en)
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dbp:name
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dbp:nameEtymology
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- Rancho Cañada de los Alisos land grant; "Aliso" means alder or sycamore in Spanish. (en)
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dbp:nameOther
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- Alisos Creek, Los Alisos Creek (en)
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- Location of the mouth of Aliso Creek in California (en)
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- Loma Ridge in the Santa Ana Mountains (en)
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- Cleveland National Forest north of Portola Hills (en)
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- Cities (en)
- Counties (en)
- Country (en)
- State (en)
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- English Canyon Creek, Aliso Hills Channel, Sulphur Creek (en)
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- Munger Creek, Dairy Fork, Wood Canyon Creek (en)
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- 33.702777777777776 -117.62222222222222
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- Aliso Creek is a 19.8-mile (31.9 km)-long, mostly urban stream in south Orange County, California. Originating in the Cleveland National Forest in the Santa Ana Mountains, it flows generally southwest and empties into the Pacific Ocean at Laguna Beach. The creek's watershed drains 34.9 square miles (90 km2), and it is joined by seven main tributaries. As of 2018, the watershed had a population of 144,000 divided among seven incorporated cities. (en)
- Aliso Creek (« ruisseau des aulnes » en espagnol, également appelé Alisos Creek en anglais) est un fleuve côtier long de 30,5 km (19 milles) situé dans le comté d'Orange dans l'État américain de Californie. Il prend sa source dans les monts Santa Ana et se jette dans l'océan Pacifique ; il est alimenté par sept affluents principaux. Le ruisseau est presque entièrement canalisé. En 2004, son bassin versant recouvrait une zone peuplée de 149 087 habitants répartis dans sept municipalités. (fr)
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- Aliso Creek (Orange County) (en)
- Aliso Creek (comté d'Orange) (fr)
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