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Santa Margarita River

Santa Margarita River
Temecula River
Country United States
State California
 - left Temecula Creek, Rainbow Creek, Pueblitos Canyon
 - right Murrieta Creek, Sandia Creek, De Luz Creek, Wood Canyon, Newton Canyon
Source Confluence of Temecula Creek and Murrieta Creek
 - location Temecula, Riverside County
 - elevation 950 ft (290 m)
 - coordinates  [1]
Mouth Pacific Ocean
 - location Camp Pendleton Marine Corps Base, San Diego County
 - elevation 7 ft (2 m) [1]
 - coordinates  [1]
Length 31 mi (50 km)
Basin 723 sq mi (1,873 km2)
Discharge for Ysidora
 - average 34.2 cu ft/s (1 m3/s)
 - max 44,000 cu ft/s (1,246 m3/s)
 - min 0 cu ft/s (0 m3/s)

The Santa Margarita River which with the addition of what is now Temecula Creek, was formerly known as the Temecula River, is a short intermittent river on the Pacific coast of southern California in the United States, approximately 30.9 miles (49.7 km)[2] long. One of the last free-flowing rivers in southern California, it drains an arid region at the southern end of the Santa Ana Mountains, in the Peninsular Ranges between Los Angeles and San Diego.


  • History 1
  • Watershed and course 2
  • Conservation and Ecology 3
  • References 4
  • External links 5


The Portolà expedition camped on the river on July 20, 1769 and named it for Saint Margaret of Antioch. A Santa Margarita rancheria is mentioned in 1795 and there is a February 23, 1836 land grant called Santa Margarita y San Onofre (later renamed Rancho Santa Margarita y Las Flores).[3]

The river was the site of several attempts to build railroads in the 1880s. During much of the 20th century the river was the subject of a long-running water rights battle between the United States Navy and the Fallbrook Public Utility District. The conflict was resolved in 1967 and the following year both entities proposed to jointly construct dams on the river. The proposal was abandoned in 1984 due to environmentalist opposition.

Watershed and course

The mainstem of the Santa Margarita River begins at the confluence of Temecula Creek[4] and Murrieta Creek,[5] in southwestern Riverside County, east of Interstate 15, 0.5 miles (0.80 km) southeast of Temecula.[4] It flows southwest through the 5 miles (8.0 km) Temecula Canyon at the south end of the Santa Ana Mountains. Along its lower 10 miles (16 km) the river forms a large floodplain as it crosses Camp Pendleton Marine Corps Base. It enters the Gulf of Santa Catalina on the Pacific approximately 3 miles (4.8 km) northwest of Oceanside.

Draining 1,922 square kilometres (742 sq mi), the Santa Margarita Watershed is the second largest river basin on the Southern California coastal plain.[6] The upper watershed consists of the 575 square kilometres (222 sq mi) Murrieta Creek subwatershed and the 948 square kilometres (366 sq mi) Temecula Creek subwatershed. Although there are two dams in the upper watershed, both dams must release water that roughly corresponds to natural flows in the tributaries that they are on. As a result, the flow of water in the Santa Margarita River is very close to what it would be in the absence of those two dams.[7]

Below the confluence of Murrieta and Temecula Creeks, the primary tributaries of the Santa Margarita River mainstem are Rainbow Creek on the left (headingdownstream) and Sandia Creek and De Luz Creeks on the right. The two latter creeks drain the Santa Rosa Plateau.[8]

Conservation and Ecology

Approximately 4,334 acres (1,754 ha) of the middle course of the Santa Margarita River in Temecula Canyon are managed by

  • The Santa Margarita River - Fallbrook Area Information by Tom Chester
  • SDSU: Santa Margarita Ecological Preserve
  • California Rivers - Friends of the Santa Margarita River

External links

  1. ^ a b c "Santa Margarita River".  
  2. ^ U.S. Geological Survey. National Hydrography Dataset high-resolution flowline data. The National Map, accessed March 16, 2011
  3. ^ Erwin G. Gudde (1960). California Place Names: The Origin and Etymology of Current Geographical Place Names. Berkeley, California: University of California Press. p. 296. Retrieved 2013-02-10. 
  4. ^ a b "Temecula Creek".  
  5. ^ "Murrieta Creek".  
  6. ^ a b c Eric D. Stein, Richard F. Ambrose (September 1998). "Cumulative Impacts of Section 404 Clean Water Act Permitting on the Riparian Habitat of the Santa Margarita, California Watershed" (PDF). Wetlands 18 (3): 393–408.  
  7. ^ "Santa Margarita Ecological Reserve". San Diego State University. Retrieved 2013-02-10. 
  8. ^ Katherine Shapiro (1997) [1991]. Refuge in an Urbanizing Land. The Santa Margarita River: Cultural and Natural Resource Value. Fallbrook, California: Santa Margarita River Foundation. 
  9. ^ a b Arthur C. Benke, Colbert E. Cushing (2005). Rivers of North America. Academic Press. p. 589.  
  10. ^ Dick Newell, OCTrackers (2010). "Analyzing Beaver Track and Sign". Retrieved 2013-02-06. 


Major riparian plants include arroyo, black, narrowleaf, Pacific, and red willow (Salix spp); California sycamore (Platanus racemosa), Fremont cottonwood (Populus fremontii), mulefat (Baccharis salicifolia) and White alder (Alnus rhombifolia).[9]

Major fishes in the Santa Margarita River include the rainbow trout (Oncorhynchus mykiss), arroyo chub (Gila orcuttii), California killifish (Fundulus parvipinnis), striped mullet, longjaw mudsucker, staghorn sculpin. Aquatic and semi-aquatic mammals include California golden beaver (Castor canadensis subauratus), muskrat, raccoon and long-tailed weasel.[9] Contemporary beaver populations survive at the headwaters of the Santa Margarita River at the confluence of Temecula Creek and Murrieta Creek.[10]

Approximately 70 species of special concern (rare, threatened, or endangered) regularly inhabiting the watershed, including 30 that are currently protected under the Endangered Species Act.[6] Two federally endangered riparian birds are the least Bell's vireo (Vireo bellii pusillus) and the southwestern willow flycatcher (Emmpidonax traillii extimus)), both of which require riparian habitat for breeding success.


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