The Onkaparinga River rises on the slopes of the [[Mount Lofty Range]] between [[Mount Torrens]] and [[Charleston, South Australia|Charleston]] and flows generally southwesterly, south of the [[Adelaide city centre]], to reach its [[mouth (river)|mouth]] at [[Port Noarlunga, South Australia|Port Noarlunga]]. The [[drainage basin|catchment area]] is over {{convert|500|km2|abbr=off}} in area, and in part includes the [[protected area]]s of the [[Encounter Marine Park]], the [[Onkaparinga River National Park]], the [[Onkaparinga River Recreation Park]] and the [[Port Noarlunga Reef Aquatic Reserve]].<ref>{{cite web|title=Aquatic Reserves And Marine Parks - Port Noarlunga|url=http://www.pir.sa.gov.au/__data/assets/pdf_file/0004/65416/10._AqResWeb.pdf|publisher=PIRSA Fisheries|accessdate=31 October 2012|url-status=dead|archiveurl=https://web.archive.org/web/20120331125626/http://www.pir.sa.gov.au/__data/assets/pdf_file/0004/65416/10._AqResWeb.pdf|archivedate=31 March 2012|df=dmy-all}}</ref><ref>{{cite web|title= MARINE PARK 15, Encounter |url= http://www.environment.sa.gov.au/files/9a3a8c59-0f34-4e4a-85e2-a1170127270a/mp-gen-map-15-encounter.pdf |publisher=Department of Environment, Water and Natural Resources|accessdate=5 November 2014}}</ref><ref name=MPpage5>{{cite web|title=Management Plan - Onkaparinga River Reserve|url=http://www.environment.sa.gov.au/files/c3a54fec-aa3a-4b63-9b6d-9e4f00b1d89c/PARKS_PDFS_ONKAPARINGA_MP.pdf|publisher=Department of Environment and Heritage|accessdate=3 April 2014|pages=5|year=2004}}</ref> The river descends {{convert|422|m}} over its {{convert|88|km|adj=on}} [[watercourse|course]].<ref name=bonzle>{{cite web |url=http://www.bonzle.com/c/a?a=p&p=206979&cmd=sp |title=Map of Onkaparinga River, SA |work=Bonzle Digital Atlas of Australia |date= |access-date=25 March 2017 }}</ref>
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Noarlunga|url=http://www.pir.sa.gov.au/__data/assets/pdf_file/0004/65416/10._AqResWeb.pdf|publisher=PIRSA Fisheries|accessdate=31 October 2012|url-status=dead|archiveurl=https://web.archive.org/web/20120331125626/http://www.pir.sa.gov.au/__data/assets/pdf_file/0004/65416/10._AqResWeb.pdf|archivedate=31 March 2012|df=dmy-all}}</ref><ref>{{cite web|title= MARINE PARK 15, Encounter |url= http://www.environment.sa.gov.au/files/9a3a8c59-0f34-4e4a-85e2-a1170127270a/mp-gen-map-15-encounter.pdf |publisher=Department of Environment, Water and Natural Resources|accessdate=5 November 2014}}</ref><ref name=MPpage5>{{cite web|title=Management Plan - Onkaparinga River Reserve|url=http://www.environment.sa.gov.au/files/c3a54fec-aa3a-4b63-9b6d-9e4f00b1d89c/PARKS_PDFS_ONKAPARINGA_MP.pdf|publisher=Department of Environment and Heritage|accessdate=3 April 2014|pages=5|year=2004}}</ref> The river descends {{convert|422|m}} over its {{convert|88|km|adj=on}} [[watercourse|course]].<ref name=bonzle>{{cite web |url=http://www.bonzle.com/c/a?a=p&p=206979&cmd=sp |title=Map of Onkaparinga River, SA |work=Bonzle Digital Atlas of Australia |date= |access-date=25 March 2017 }}</ref>
[[File:Onkaparinga Estuary 1.jpg|thumb|600px|centre|Onkaparinga Estuary on winter afternoon at [[Noarlunga Downs, South Australia|Noarlunga Downs]], facing east]]
The Onkaparinga River is the second major river within the Adelaide metropolitan area, after the River Torrens. It is a source of fresh water for Adelaide. Mount Bold Reservoir was constructed between 1932 and 1938 along a section of its path approximately 20 kilometres (12 miles) inland. Much of its flow is diverted via a tunnel from the Clarendon Weir to the Happy Valley Reservoir, that in turn supplies some 40 per cent of Adelaide's water supply. Most years the flow to the reservoir is supplemented by water pumped from the River Murray via a pipeline from Murray Bridge.
Downstream from Mount Bold Reservoir is the Clarendon Weir. To maintain levels at Clarendon Weir, water is released only as required. The Onkaparinga Gorge extends from Clarendon to Old Noarlunga. An estuary extends from Old Noarlunga to the river's mouth between the suburbs of Port Noarlunga and Port Noarlunga South. The estuary is a significant breeding area for local marine fish species.
The Coast to Vines rail trail crosses over the river just west of where Main South Road crosses over. The Seaford railway line passes over the river on a 1.2-kilometre (0.75 mi) elevated bridge (known as the Onkaparinga Valley Bridge) which was built between 2011 and 2014.[8]
Etymology
The name derives from the indigenous Kaurna word, Ngangkiparinga, which translates as 'The Women's River'.[9]
In 1837 Surveyor General Colonel William Light named it Field's River, or the Field River, after Lieutenant William George Field RN (1804-1850) of the brig Rapid, who carried out the first surveys in the vicinity of its estuary, but subsequent Governor George Gawler soon reinstated the Indigenous name. The first Europeans to explore its sources and the Onkaparinga Valley were the party of Dr. George Imlay and John Hill in January 1838.[10]