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Sweetwater River (California)

Sweetwater River
Agua Dulce
The river's upper reaches near State Route 79
Name origin: Spanish; "Agua Dulce" meaning "sweet water"
Country United States
State California
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)
 - coordinates  [1]
Mouth Sweetwater Marsh
 - location Between National City and Chula Vista
 - elevation 13 ft (4 m)
 - coordinates  [1]
Length 55 mi (89 km)
Basin 230 sq mi (596 km2)
Discharge mouth
 - 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)
Map of the river basin

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.[2] The Spanish called the river "Agua Dulce", a name they applied to good clear water anywhere they lived.[3]


  • Course 1
  • Watershed 2
  • History 3
  • Dams 4
  • Ecology 5
  • Recreation 6
  • Tributaries 7
  • Picture gallery 8
  • References 9
  • External links 10


The river rises as an intermittent trickle flowing out 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.[4]

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. California State Route 54 straddles the river, with eastbound lanes to the south and westbound lanes to the north, for a few miles between I-5 and I-805. 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.[4]


View of the Sweetwater River near its mouth on San Diego Bay

This river drains a long, narrow basin of 230 square miles (600 km2)[5] 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.[6]

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.[6] The watershed has a human population of over 300,000;[6] 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.[7]

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.[8]


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.[9] 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.[10][11]

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.[12] The Spanish established settlements in the area in the 1760s mainly clustering around Mission San Diego de Alcala. From 1795, the lower part of the watershed was part of the Rancho del Rey (Ranch of the King) under Spain, this land south of the Presidio of San Diego, that later became the Rancho de la Nación. In an attempt to save some of the lands of the San Diego Mission from secularization, their lands in the middle reach of the Sweetwater were given by the mission padres to Apolinaria Lorenzana in 1833. These lands became the Rancho Jamacha and Rancho San Juan de Las Secuas. Later, after passing from the hands of Mexico to 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.[13] 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"[14] presumably because of the large irrigation diversions.


View of Sweetwater Dam, the lowermost dam on the river, in 1917

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.[15] 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."[16] 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.[17][18][19] 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.[20]

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.[21]



Tributaries of the Sweetwater are listed from mouth to source:

Picture gallery


  1. ^ a b "Sweetwater River".  
  2. ^ 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.  
  3. ^ Fetzer, Leland (2005). San Diego County Place Names A to Z'. San Diego:  
  4. ^ a b USGS Topo Maps for United States (Map). Cartography by  
  5. ^ "Sweetwater River". Sweetwater Authority. Retrieved 2011-01-21. 
  6. ^ a b c "The Sweetwater Watershed". San Diego Bay Watersheds. San Diego State University. Retrieved 2011-01-21. 
  7. ^ "Coastal Basins of San Diego County, California, and Northern Baja California, Mexico" (PDF) (Map). California Water Science Center. Cartography by USGS (U.S. Geological Survey). Retrieved 2011-01-21. 
  8. ^ "Sweetwater Marsh". U.S. Fish and Wildlife Service. Retrieved 2010-07-03. 
  9. ^ "Timeline of San Diego History". San Diego History Center. Retrieved 2011-02-11. 
  10. ^ "Diegueño Indian Tribe". Access Genealogy. Retrieved 2011-02-11. 
  11. ^ "Diegueno (Kumeyaay)". Four DIrections Institute. 2007-08-03. Retrieved 2011-02-11. 
  12. ^ "Juan Rodriguez Cabrillo". San Diego History Center. Retrieved 2011-02-11. 
  13. ^ "Sweetwater Reservoir". Sweetwater Authority. Retrieved 2011-02-11. 
  14. ^ Mead et al., p. 359
  15. ^ Karen Kucher (2010-06-01). "Pond turtle surprises caretakers at wildlife refuge". San Diego Union-Tribune. Retrieved 2010-07-03. 
  16. ^ Clifford L. Graves (July 1964). "An Early San Diego Physician: David Hoffman". The Journal of San Diego History. Retrieved 2010-07-03. 
  17. ^ U.S. Geological Survey Geographic Names Information System: Beaver Hollow
  18. ^ David L. Durham (January 2001). Durham's Place Names of San Diego County. Word Dancer Press. p. 5.  
  19. ^ Fetzer, Leland (2005). San Diego County Place Names A to Z'. San Diego:  
  20. ^ "Historical Topo Maps, San Diego County, Map Number 1". December 1903. Retrieved 2011-02-08. 
  21. ^ "San Diego Trout Streams". San Diego Trout. Retrieved 2010-07-03. 

External links

  • Sweetwater Authority
  • Sweetwater Marsh, a unit of the San Diego Bay National Wildlife Refuge
  • Columbia Gazetteer of North America
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