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	Santa Margarita River - Wikipedia, the free encyclopedia
		The Santa Margarita River is a short intermittent river on the Pacific coast of southern California in the United States, approximately 50 mi (80 km) long.
		One of the last free-flowing rivers in southern California, it drains an arid region of the Coast Ranges between Los Angeles and San Diego at the southern end of the Santa Ana Mountains.
		Approximately 4334 acres (17.54 km²) of the middle course of the river in Temecula Canyon are owned and managed by San Diego State University as the Santa Margarita Ecological Preserve.
	en.wikipedia.org /wiki/Santa_Margarita_River (312 words)

	Western Riverside County MSHCP Species Accounts - Fish
		Within the Santa Ana River, the sucker larvae and juveniles were observed to migrate from the mainstem of the river to the mouths of tributaries, apparently dependant upon water temperature.
		The Santa Ana sucker is intolerant of turbidity, probably because the suspended sediments interrupt light penetration into the water column and reduce algal growth and therefore the forage base for the sucker.
		The population of the Santa Ana sucker within the Santa Clara River is introduced, and a portion of population is hybridized.
	www.tlma.co.riverside.ca.us /mshcp/volume2/fish.html (12539 words)

	The Santa Margarita River
		The SMR, along with neighboring open land, is the largest regional ecosystem near the coast south of the Santa Monica Mountains.
		The Santa Margarita River: Refuge in an Urbanizing Land, by Friends of the Santa Margarita River; NCT 5/19/00, B1, B8; Historical Timeline for Fallbrook, CA Area.
		River-running the Santa Margarita River from Temecula Canyon to Willow Glen
	home.znet.com /schester/fallbrook/tidbits/smr.html (1258 words)

	Santa Margarita Watershed
		The Santa Margarita River watershed encompasses approximately 750 square miles in northern San Diego and southwestern Riverside counties.
		The Santa Margarita River is formed near the City of Temecula in Riverside County at the confluence of the Temecula and Murrieta creek systems.
		The lower river and estuary have largely escaped the development typical of other regions of coastal Southern California, and are therefore able to support a relative abundance of functional habitats and wildlife.
	www.projectcleanwater.org /html/ws_santa_margarita.html (326 words)

	CWIS -- "California Wetlands Information System"
		The estuary is located at the mouth of the Santa Margarita River in northern San Diego County approximately 1 mile north of the City of Oceanside.
		It is the longest free flowing river in coastal southern California; the channel is braided and supports the most extensive riparian corridor in the county.
		The average annual sand and gravel yield for the Santa Margarita river over a 25 year period (1950-1975) was estimated at 8,160 tonnes (a tonne is defined as a metric ton and equals 2,204.6 pounds).
	ceres.ca.gov /wetlands/geo_info/so_cal/santa_margarita.html (2387 words)

	Ecology of the Santa Margarita River: Missing and Affected Species
		The Santa Margarita river is considered a leading candidate for restoration of the species in the region.
		In 1982-1983 two pairs were recorded nesting in reeds at the salt/fresh water interface of the Santa Margarita estuary.
		The population in the Santa Margarita watershed and the Santa Ana Mountains has become virtually isolated, and is so small that there is great fear that there is not sufficient genetic diversity to sustain the species here in the long run.
	www.fsmr.org /ecology/affected_species.html (617 words)

	San Diego Wetlands - Santa Margarita (Site not responding. Last check: 2007-10-10)
		The Santa Margarita River is the last free-flowing river in coastal southern California.
		The Santa Margarita riparian corridor contains the highest density and overall diversity of bird species of any natural area in a southern California coastal river basin, including the least Bell’s vireo and the southwestern willow flycatcher.
		The Friends of the Santa Margarita River work to preserve the river and its 740 square mile watershed, monitor wildlife and educate the public.
	www.seaworld.org /swc/wetlands/sd_county_wetlands/santa_margarita.htm (250 words)

	Tha Making of a Natural Sandy Beach
		It is a common belief that naturally flowing rivers in Southern California are a major source of beach sand, replenishing grains washed to sea by heavy surf and high tides.
		The long-standing canon of beach dynamics, that rivers supply beaches with sand, may be overstated and overly simplistic, says Escondido-resident Neal Driscoll, a professor in the Geosciences Research Division at Scripps Institution of Oceanography, who has California Sea Grant support to study sedimentation patterns in San Diego and Orange counties.
		The theory that sediments carried by rivers might be bypassing the beach zone was first put forth by geologist Jonathan Warrick of the U.S. Geological Survey in Santa Cruz during studies of the Santa Clara River in Ventura County.
	www-csgc.ucsd.edu /STORIES/NaturalSandyBeach.html (1854 words)

	Hydrology
		Four important estuaries are on the base at the mouths of the Santa Margarita, San Onofre, Las Flores, and San Mateo Rivers, and minor estuaries exist at the mouths of all the coastal drainages.
		The lower portions of the Santa Margarita and San Onofre watersheds are characterized by alluvial valleys containing the principal source of water for Camp Pendleton.
		The magnitude of roughness decrease in each of the watersheds was: 12.9% decrease in the Santa Margarita, 4.3% in the San Juan, 2.6% in the San Luis Rey, 1.2% in the San Mateo, and 0.3% in the San Onofre.
	www.gsd.harvard.edu /studios/brc/report/15_hydrology.html (2643 words)

	Cite as:
		Beaver activities and their effects on the ecosystem in the Santa Margarita River is of concern because, as major ecosystem engineers, beavers have a great impact on the environment in which they live.
		The Santa Margarita river was not one of the three rivers into which beavers were introduced and the way in which beavers reached and colonized the Santa Margarita River is unclear.
		Rainbow trout are native to the Santa Margarita River.
	www.sci.sdsu.edu /classes/bio354lab/rob_beav.html (1517 words)

	EPA: Federal Register: Record of Decision for the Santa Margarita River Flood Control Project and Basilone Road Bridge ...
		Levee Alignment 1 is a 16,585 foot-long levee extending from STP 3 north to approximately 1,000 feet upstream of the Santa Margarita Ranch House Complex.
		The Santa Margarita River supports some of the largest known populations of the federally-listed endangered least Bell's vireo, southwestern willow flycatcher, and southwestern arroyo toad.
		I have determined that implementation of the Santa Margarita Flood Control Project is the only practicable alternative, consistent with law and policy, to avoid the potential severe consequences posed by potential significant flood events to existing multi-million dollar facilities at MCB Camp Pendleton and MCAS Camp Pendleton.
	www.epa.gov /fedrgstr/EPA-IMPACT/1998/February/Day-12/i3614.htm (5773 words)

	Major San Diego County Rivers
		Each of the major rivers in San Diego County are part of a much larger drainage system, or watershed, consisting of tributaries and a system of lakes, reservoirs, streams and creeks.
		The lower river and estuary have largely escaped the development typical of other regions of coastal Southern California, and are therefore able to support a relative abundance of functional habitats and wildlife (Source: Project Clean Water, 2005).
		One of the last free flowing rivers in Southern California, the Santa Margarita River is widely recognized by various local, state and federal agencies to be an irreplaceable scenic and ecological treasure.
	interwork.sdsu.edu /fire/resources/MajorSanDiegoCountyRivers.htm (994 words)

	WMC: Spring Field Trip - Fall 1998
		Under natural conditions, the river would be an intermittent stream with high run-off in the winter and spring, and little or no flow in the summer months.
		As the river and its tributaries flow toward the sea, streamflow recharges 29 groundwater basins.
		In contrast to the Santa Ana, the lower reaches of the Santa Margarita River are mostly rural with the mainstem and many of the tributaries undammed.
	www.watershed.org /news/fall_98/2_field_trip.html (1944 words)

	Group hopes to eradicate arundo from Santa Margarita River North County Times - North San Diego and Southwest Riverside ...
		The Santa Margarita and San Luis Rey Watersheds Weed Management Area, a public-private partnership created in March, is focusing on arundo and tamarisk plants, commonly known as giant reed and salt cedar, respectively, in the $70,000 effort, officials said Tuesday.
		The rest of the 33 acres to be sprayed are on the main stem of the Santa Margarita and along Rainbow Creek in San Diego County.
		The tamarisk plants grow mostly in the drier upper sections of the Santa Margarita and its tributaries in Riverside County.
	www.nctimes.com /articles/2000/09/20/export17813.txt (909 words)

	Fallbrook utility changes course of wastewater recycling plan \| The San Diego Union-Tribune
		Known as the Santa Margarita Conjunctive Use Project, it is intended to significantly reduce Fallbrook's and Camp Pendleton's reliance on imported water.
		The project is expected to cost about $50 million and produce as much as 16,000 acre-feet of treated water each year from the Santa Margarita River, with 60 percent to 70 percent going to Camp Pendleton and the rest to Fallbrook.
		Fallbrook's use of water from the Santa Margarita has been talked about for 50 years, but may be close to reality.
	www.signonsandiego.com /uniontrib/20040407/news_1mi7fwater.html (869 words)

	Water Management in the Santa Margarita Basin of Southern California (Site not responding. Last check: 2007-10-10)
		Problem: The Santa Margarita Watershed, located in southern California near the town of Temecula, provides most of the water to local residents of the upper basin and to Camp Pendleton Marine Corps Base in the lower basin.
		By 1940, base flow in the river had been reduced to such an extent that water users in the lower basin filed a lawsuit against water users in the upper basin.
		The result of this lawsuit was the "1940 stipulated judgement," which partitioned water in the upper basin between uses in the upper basin and flow to the lower basin.
	ca.water.usgs.gov /projects00/ca540.html (1304 words)

	Western Riverside County MSHCP
		The arroyo chub is known to occur in the Santa Ana River from Jurupa, downstream to Prado Basin, Santa Margarita River near Temecula, and headwaters of Santa Margarita River with a known population in Temecula Creek within Riverside County (NDDB, Swift et al.
		The species is threatened by impacts to rivers and streams, channelization, water diversion, groundwater over drafting, sand and gravel mining, changes in the watershed that result in erosion and debris torrents, pollution, the establishment of introduced or non-native fishes, and flood control activities.
		The rivers within the Los Angeles area of the arroyo chub range have dams that isolate and fragment fish populations.
	ecoregion.ucr.edu /full.asp?sp_num=13 (1834 words)

	Santa Margarita Ecological Reserve
		The Santa Margarita Ecological Reserve (SMER) is a Research Field Station of San Diego State University (SDSU) and the San Diego State University Foundation.
		The Santa Margarita River officially begins at the northeastern boundary of the Preserve, at the confluence of Temecula and Murrieta Creeks.
		The upper watershed of the Santa Margarita River is thus the combined watersheds of Temecula and Murrieta Creeks.
	tchester.org /sd/places/smer/index.html (2064 words)

	Santa Ana Mountains - Wikipedia, the free encyclopedia
		The Santa Ana Mountains are a short peninsular mountain range along the coast of Southern California in the United States.
		Saddleback, located approximately 20 mi (32 km) east of Santa Ana, is visible from almost all parts of Orange County, as well most other regions of Southern California,and is usually the only mountain in the range to be dusted with snow in winter storms.
		Highway 91, which follows the Santa Ana River through a pass between the Santa Ana Mountains on the south and the Chino Hills on the north, is one of California's most congested routes.
	en.wikipedia.org /wiki/Santa_Ana_Mountains (381 words)

	Projects Provided by HDR
		Developing additional capacity to increase service and reliability along this important transportation corridor is a high priority, and design of a second main track and new railroad bridge across the Santa Margarita River are key components of the plan.
		The proposed project replaces the existing Santa Margarita River Bridge with a new 755-foot two-track bridge, composed of a 500-foot main river bridge and a 255-foot approach trestle at the south end.
		The proposed main river structure is a 32-foot wide cast-in-place concrete box girder with continuous spans of 150 feet, 200 feet and 150 feet.
	www.hdrinc.com /13/38/1/default.aspx?projectID=238 (1085 words)

	Santa Margarita Ecological Reserve : Habitat Connectivity
		The Santa Margarita Ecological Reserve is a large block of habitat and a key resource in the center of the needed "Landscape Linkage".
		The Santa Margarita River, which winds through this area, is the last intact riparian corridor in southern California and an important water source for Camp Pendleton.
		The Santa Ana - Palomar Mountains Linkage Plan is designed to provide information and support to a variety of planning efforts and actions including conservation acquisitions, urban growth plans and the identification of prioritized areas linking larger regional natural lands from the coastal Santa Ana ranges with the inland Palomar mountain ranges.
	fs.sdsu.edu /kf/reserves/smer/habitat.php (1781 words)

	Santa Margarita Ecological Reserve Natural Diversity
		The Santa Margarita Field Station lies in the chaparral/coastal sage scrub/oak woodland vegetation zone of southern California.
		The northern portion of the station is dominated by the deep gorge of the Santa Margarita River, the last free-flowing stream in southern California.
		Santa Margarita Ecological Reserve, with the field station and river labeled.
	www.sci.sdsu.edu /BFS/main/SMER/smer.natdiv.html (611 words)

	ET 4/94: Santa Margarita River: refuge in an urbanizing land
		The Santa Margarita River also supports the largest remaining native population of arroyo chub, a small fish that was formerly abundant throughout Southern California.
		In recognition of the river's outstanding ecological values, the Bureau of Land Management has determined that a small segment of the river flowing through scattered public lands is eligible for national Wild and Scenic River status.
		Friends of the River, the Friends of the Santa Margarita River and the San Diego State University Ecological Reserve are proposing national Wild and Scenic River designation for six miles of the Santa Margarita River downstream of Temecula to the Riverside-San Diego county line.
	www.sdearthtimes.com /et0494/et0494s4.html (803 words)

	Southern California FishingNetwork.net: Santa Margarita River (Site not responding. Last check: 2007-10-10)
		The Santa Margarita River is located in south-western Riverside Co., near the town of Fallbrook.
		Most of the land surrounding the river is either privately owned, or part of the Camp Pendelton Marine base, where it flows into the ocean.
		However, there are wild rainbow and brown trout in this river, along with the native steelhead, which is very rarely sighted.
	fishingnetwork.net /socal/margarita.shtml (83 words)

	CBI - (Site not responding. Last check: 2007-10-10)
		The ecological integrity or condition of the river is a function of an array of interrelated physical, hydrological, and biological factors.
		In addition, a number of these factors may be influenced by stresses present in the Santa Margarita watershed, the prescribed settlement flows, or other strategies to abate threats to the Santa Margarita River system and, therefore, are subject to change even as we attempt to monitor their baseline patterns.
		Identify and monitor key ecological factors of the Santa Margarita River system to gain a better understanding of the baseline patterns of key riverine processes operating in the watershed, their range of variation, and their interrelationships.
	www.consbio.org /cbi/projects/santa_margarita/santa_margarita.htm (418 words)

	Friends of the Santa Margarita River (Site not responding. Last check: 2007-10-10)
		The River stretches from inland valleys all the way to a robust estuary at the Pacific shoreline.
		Unlike every other coastal river in Southern California, the Santa Margarita River is free-flowing, giving a home to Southern Californian residents, the native wildlife, who were here long before any human visited the area.
		The organization began in 1983 through the efforts of environmental activists Evelyn Ashton and Emily Durbin to protest plans for constructing two dams on the Santa Margarita River which would have destroyed the native ecosystem of the last free-flowing coastal river in Southern California.
	fsmr.org /index.html (285 words)

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