|San Lorenzo Creek|
|Native name||Spanish: Arroyo de San Lorenzo|
|• location||east of Hayward, California|
|• location||at Palomares Creek and Eden Canyon Creek|
|Mouth||San Francisco Bay|
|Hayward Regional Shoreline|
|0 ft (0 m)|
|• left||Crow Creek, Castro Valley Creek|
|• right||Sulphur Creek (diversion)|
San Lorenzo Creek (Spanish : Arroyo de San Lorenzo) is a 10.7-mile-long (17.2 km) year-round natural stream flowing through Hayward, California, into San Francisco Bay at the Hayward Regional Shoreline.
The creek begins in Castro Valley, and is the main tributary within the San Lorenzo Watershed, including the formerly independent Sulphur Creek, which had most of its flow diverted into San Lorenzo Creek in the 1960s to reduce the risk of flooding in downtown Hayward. Only in large flow events does some of the creek flow follow its old course into the Bay.The creek runs through the town of San Lorenzo and empties into San Francisco Bay. A portion of the San Francisco Bay Trail runs along the mouth of the creek. The Cull Canyon and Don Castro reservoirs, both located within regional parks, feed into the creek.
The creek marks the farthest northward point of exploration by the Portolá expedition of 1769–70. Scouts camped at the creek before turning back to join the main party on the west side of the bay. Further explorations, led by Monterey presidio commander Pedro Fages in 1770 and 1772, also used the camp before continuing to the north.
From records dating to 1772, the creek was previously known to Spanish colonists as Arroyo de San Salvador de Horta, and Arroyo de la Harina. The current name for the creek, Arroyo de San Lorenzo, dates to at least 1812, and was recorded as such in land grants from 1841 and 1842.
El Camino Viejo now Mission Boulevard, passed through what is now San Lorenzo, California, crossing San Lorenzo Creek where Mission Boulevard crosses it now.
San Lorenzo Creek historically supported steelhead (the anadromous form of the coastal rainbow trout Oncorhynchus mykiss irideus), ,and other salmonids. A 1997 paper states that, due to reasons tied to the ever increasing urbanization, dams, and their effect on the area, no sign of juvenile nor mature steelhead could be found in the creek. Since steelhead in the Bay Area and California's Central Coast were listed as threatened under the Endangered Species Act in 1997, numerous organizations, and governmental agencies have cooperated on restoration projects to allow migratory fish from the Bay to reach spawning habitat in various Bay Area watersheds.
Coyote Creek is a river that flows through the Santa Clara Valley in California, United States.
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San Francisquito Creek is a creek that flows into southwest San Francisco Bay in California, United States. Historically it was called the Arroyo de San Francisco by Juan Bautista de Anza in 1776. San Francisquito Creek courses through the towns of Portola Valley and Woodside, as well as the cities of Menlo Park, Palo Alto, and East Palo Alto. The creek and its Los Trancos Creek tributary define the boundary between San Mateo and Santa Clara counties.
San Leandro Creek is a 21.7-mile-long (34.9 km) year-round natural stream in the hills above Oakland in Alameda County and Contra Costa County of the East Bay in northern California.
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Redwood Creek is a 9.5-mile-long (15.3 km) perennial stream located in San Mateo County, California, United States which discharges into South San Francisco Bay. The Port of Redwood City, the largest deepwater port in South San Francisco Bay, is situated on the east bank of Redwood Creek near its mouth, where the creek becomes a natural deepwater channel.
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San Gregorio Creek is a river in San Mateo County, California. Its tributaries originate on the western ridges of the Santa Cruz Mountains whence it courses southwest through steep forested canyons. The San Gregorio Creek mainstem begins at the confluence of Alpine and La Honda Creeks, whence it flows 12 miles (19 km) through rolling grasslands and pasturelands until it meets the Pacific Ocean at San Gregorio State Beach. It traverses the small unincorporated communities of La Honda, San Gregorio, Redwood Terrace and Sky Londa.
Pescadero Creek is a major stream in Santa Cruz and San Mateo counties in California. At 26.6 miles (42.8 km), it is the longest stream in San Mateo County and flows all year from springs in the Santa Cruz Mountains. Its source is at 1,880 feet (570 m) above sea level on the western edge of Castle Rock State Park, with additional headwaters in Portola Redwoods State Park, and its course traverses Pescadero Creek County Park and San Mateo County Memorial Park before entering Pescadero Marsh Natural Preserve at Pescadero State Beach and thence to the Pacific Ocean 14.4 miles (23 km) south of Half Moon Bay.
Upper Penitencia Creek is actually one of two creeks by the name Penitencia Creek in the northeastern Santa Clara Valley of Santa Clara County, California. They are both tributaries of Coyote Creek. The upper creek was diverted southwestward, connecting it directly to Coyote Creek ca. 1850 by a farmer to irrigate his fields, permanently splitting Upper Penitencia Creek from Lower Penitencia Creek. Upper Penitencia Creek drains the western slopes of Mount Hamilton of the Diablo Range, and passes through Alum Rock Park, before ending at its confluence with Coyote Creek at Berryessa Road. In December 2018, the San Francisco Estuary Institute published a report commissioned by the Santa Clara Valley Water District to establish a vision for Upper Penitencia Creek's lower four miles focusing on ways "to expand flow conveyance and flood water storage from the Coyote Creek confluence upstream to the Dorel Drive bridge in a manner that works with the existing landscape features and supports habitats for native species".
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Corte Madera Creek is a 7.3-mile-long (11.7 km) creek that flows north-northwest to Searsville Dam and then joins with Bear Creek to form San Francisquito Creek in California.
Bear Creek, or Bear Gulch Creek, is a 6.6-mile-long (10.6 km) southeastward-flowing stream originating north of the summit of Sierra Morena in the Santa Cruz Mountains, near the community of Kings Mountain in San Mateo County, California, United States. It flows through the town of Woodside. Bear Creek and Corte Madera Creek join to become San Francisquito Creek in the Jasper Ridge Biological Preserve at Stanford University.
West Union Creek is a 4.5-mile-long (7.2 km) stream originating on the east slope of Kings Mountain in the Santa Cruz Mountains, in San Mateo County, California, United States. It flows easterly down to the valley formed by the San Andreas Rift where it turns near the Phleger Estate to flow southeasterly on an unusually level course to Adobe Corner in the town of Woodside where it joins Bear Gulch Creek, which in turn flows to San Francisquito Creek and ultimately, San Francisco Bay.
Alambique Creek, or Arroyo Alembique, is a 2.7-mile-long (4.3 km) stream located in San Mateo County, California in the United States. It is part of the San Francisquito Creek watershed.
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