Sweetwater River (California)
The river's upper reaches near State Route 79
|Name origin: Spanish; "Agua Dulce" meaning "sweet water"|
|Region||San Diego County|
|- right||North Fork Sweetwater River|
|Cities||Descanso, La Presa, Bonita, National City, Chula Vista|
|Source||Upper Green Valley|
|- location||Cuyamaca Mountains|
|- elevation||4,809 ft (1,466 m)|
|- location||Between National City and Chula Vista|
|- elevation||13 ft (4 m)|
|Length||55 mi (89 km)|
|Basin||230 sq mi (596 km2)|
|- average||14.7 cu ft/s (0 m3/s)|
|- max||45,500 cu ft/s (1,288 m3/s)|
|- min||0 cu ft/s (0 m3/s)|
The Sweetwater River is a 55-mile (89 km) long stream in southwestern California in the United States. From its headwaters high in the Cuyamaca Mountains, the river flows generally southwest, first through rugged hinterlands but then into the urban areas surrounding its mouth at San Diego Bay. Its drainage basin covers more than 230 square miles (600 km2), all of it in San Diego County. Towns on the river include Descanso, La Presa and Chula Vista.
The term "Sweetwater" is a name often given to freshwater which tastes good in regions where much of the water is bitter to the taste. The Spanish called the river "Agua Dulce", a name they applied to good clear water anywhere they lived.
The river rises as an intermittent trickle flowing out of Upper Green Valley, deep in the semi-arid Cuyamaca Mountains near Stonewall Peak. It flows south-southwest, receiving Harper Creek from the left and Stonewall Creek from the right, then coursing through narrow valleys and passing the small town of Descanso. As the river enters the Cleveland National Forest, it cuts through a steep and spectacular rocky gorge and crosses under a high bridge of Interstate 8. Shortly after leaving the national forest, it flows into Loveland Reservoir, formed by Loveland Dam, the first of two major dams along the Sweetwater.
Continuing westwards, it receives the North Fork from the right, travels by the city of Rancho San Diego and passes through the Rancho San Diego Golf Course. The river then enters Sweetwater Reservoir, which is formed by the Sweetwater Dam. Below the dam, the Sweetwater flows through Sweetwater Regional Park in a generally suburban area, passing the city of Bonita. Bending northwest, the river enters a flood control channel and passes between National City and Chula Vista. The tidal portion of the river, which starts roughly here, is called the Sweetwater Marsh. The river empties into San Diego Bay about 7.5 miles (12.1 km) southeast of downtown San Diego.
This river drains a long, narrow basin of 230 square miles (600 km2) in extreme southern California, with its mouth less than 20 miles (32 km) north of the United States-Mexico border. Much of the river's watershed is mountainous, and the highest point is 5,730 feet (1,750 m) above sea level at Stonewall Peak in the Cuyamacas Mountains. A large portion of the drainage lies within the Cleveland National Forest, but few trees are actually supported by the arid climate. The Sweetwater is the largest river flowing into San Diego Bay.
Most of the drainage, nearly 64 percent, comprises wilderness or designated parks and open space. However, approximately 30% is urban development and part of the San Diego metro area. Native American reservations also occupy part of the land. The watershed has a human population of over 300,000; mostly residing in the residential cities of Chula Vista, National City, and others such as La Presa, Bonita and Rancho San Diego, all in the less rugged western portion of the basin.
The eastern drainage divide of the Sweetwater watershed lies on the main divide of the Cuyamacas, which also separates streams of the Pacific slope from streams draining to the endorheic basin of the Salton Sea farther to the east. To the north, the Sweetwater basin shares borders with those of the San Diego River and the smaller streams that drain portions of National City and San Diego. On the south, it is bordered by the Otay River and Tijuana River drainages – specifically for the Tijuana, the subwatershed of Cottonwood Creek, the river's main tributary in the U.S.
Before reaching San Diego Bay, the river flows into 316-acre (1.28 km2) Sweetwater Marsh, a part of the San Diego National Wildlife Refuge. Adjacent to the marsh is the Chula Vista Nature Center hosting nature walks and an aviary with native birds such as burrowing owls, egrets and herons.
In pre-Anglo times, the Sweetwater River was a small but year-round stream, lined on both banks by extensive riparian forests, marshes and floodplains. It is believed that humans first arrived in the San Diego Bay area between 20,000 and 30,000 years ago. Native American tribes on the river were subdivisions of the Kumeyaay or Diegueño ethnic group, their villages included Sekwan and Hamacha on the middle portion of the stream; Amotaretuwe to the north, and Ekwiamak in the headwaters portion.
The first European to arrive in the region was probably Juan Rodríguez Cabrillo, who sailed his ship, the San Salvador, into San Diego Bay on September 28, 1542. Cabrillo did not stay in the area for long, but his visit helped Spain lay claim to the area. The Spanish established settlements in the area in the 1760s mainly clustering around Mission San Diego de Alcala. Later, after passing through the hands of Mexico and finally the United States, emigrants began arriving in the San Diego area in great numbers, many of them settling along the Sweetwater, establishing irrigated farms. The Sweetwater Dam was built in 1888 to provide storage for agricultural and municipal uses. By the late 1800s, the stream was described as having "practically no living water, except at its extreme sources and for 10 or 20 miles down from the summit of the range" presumably because of the large irrigation diversions.
On its journey to the sea, the Sweetwater is interrupted by three dams. The first is Palo Verde Dam, a small rockfill structure about 2.5 miles (4.0 km) southeast of Alpine, serving mainly for recreation and flood control. Several miles below Palo Verde lies the much larger Loveland Dam (Sweetwater Falls Dam), which forms Loveland Reservoir. Below here, the Sweetwater is free flowing until about 8 miles (13 km) above the mouth, where the Sweetwater Dam forms the last and largest, Sweetwater Reservoir.
Loveland and Sweetwater are both operated by the Sweetwater Authority. The former serves mainly for flood control while Sweetwater functions as a reserve water storage facility for the cities downstream, including San Diego, National City and Chula Vista and also as a terminus for piped-in water from the San Diego Aqueduct.
Recently the surprising discovery of a Western pond turtle (Actinemys marmorata), an IUCN Red List endangered species, in a tributary of the Sweetwater River near Jamul, California alerted wildlife officials that the turtle is still extant in the area. The nearby San Diego National Wildlife Refuge is home to endangered birds such as the Least Bell’s Vireo (Vireo bellii pusillus) and California Gnatcatcher (Polioptila californica) and the rare Quino Checkerspot (Euphydryas editha quino) butterfly.
It has been controversial whether beaver (Castor canadensis) were native to San Diego County. However, a report on the fauna of the county by Dr. David Hoffman in 1866 stated "Of the animal kingdom we have a fair variety: the grizzly bear, the antelope, the deer, the polecat, the beaver, the wildcat, the otter, the fox, the badger, the hare, the squirrel, and coyotes innumerable." Indirect evidence of beaver in San Diego County includes a creek named Beaver Hollow which runs 3.25 miles into the Sweetwater River about 6.5 miles southwest of Alpine. Beaver Hollow is named on the USGS Topo Map for Cuyamaca in 1903, which is twenty years before California Department of Fish and Game began beaver re-introductions in California.
The upper (above Descanso, California) Sweetwater River and several small tributaries hold wild Rainbow trout (Oncorhyncus mykiss) populations, including Cold Springs Creek, Harper Creek, Japacha Creek, Jauquapin Creek, and Stonewall Creek.
|This section requires expansion. (June 2011)|
Tributaries of the Sweetwater are listed from mouth to source:
Picture gallery 
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- "Sweetwater River". Geographic Names Information System, U.S. Geological Survey. 1981-01-19. Retrieved 2011-01-20.
- Erwin G. Gudde, William Bright (2004). California Place Names: The Origin and Etymology of Current Geographical Names. Berkeley, California: University of California Press. p. 381. ISBN 978-0-520-24217-3. Retrieved 2010-07-03.
- Fetzer, Leland (2005). San Diego County Place Names A to Z'. San Diego: Sunbelt Publications. p. 143. Retrieved 2011-11-20.
- ACME Mapper. USGS Topo Maps for United States (Map). Cartography by United States Geological Survey. http://mapper.acme.com/. Retrieved 2011-01-20.
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- U.S. Geological Survey. Coastal Basins of San Diego County, California, and Northern Baja California, Mexico (Map). Cartography by USGS. http://ca.water.usgs.gov/sandiego/images/maps/homepage/Plate_1c_pp_size16X22-b.pdf. Retrieved 2011-01-21.
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- "Diegueno (Kumeyaay)". Four DIrections Institute. 2007-08-03. Retrieved 2011-02-11.
- "Juan Rodriguez Cabrillo". San Diego History Center. Retrieved 2011-02-11.
- "Sweetwater Reservoir". Sweetwater Authority. Retrieved 2011-02-11.
- Mead et al., p. 359
- Karen Kucher (2010-06-01). "Pond turtle surprises caretakers at wildlife refuge". San Diego Union-Tribune. Retrieved 2010-07-03.
- Clifford L. Graves (July, 1964). "An Early San Diego Physician: David Hoffman". The Journal of San Diego History. Retrieved 2010-07-03.
- U.S. Geological Survey Geographic Names Information System: Beaver Hollow
- David L. Durham (2001-01). Durham's Place Names of San Diego County. Word Dancer Press. p. 5. ISBN 978-1-884995-32-3. Retrieved 2011-01-28.
- Fetzer, Leland (2005). San Diego County Place Names A to Z'. San Diego: Sunbelt Publications. p. 10. Retrieved 2011-11-20.
- "Historical Topo Maps, San Diego County, Map Number 1". 1903-12. Retrieved 2011-02-08.
- "San Diego Trout Streams". San Diego Trout. Retrieved 2010-07-03.
- Sweetwater Authority
- Sweetwater Marsh, a unit of the San Diego Bay National Wildlife Refuge
- Columbia Gazetteer of North America