Australian Government Bureau of Meteorology, National Water Operations Change Forecast Text Minor Flood Warning For The Onkaparinga River Issued at 07:39 AM ACST on Tuesday 25 August 2026 Flood Warning Number: 5 MINOR FLOODING POSSIBLE AT CLARENDON WEIR AND OLD NOARLUNGA FROM EARLY TUESDAY MORNING Moderate to locally heavy rainfall has been observed across the Onkaparinga catchment since Monday afternoon. This has caused river and creek level rises, and minor flooding is possible along the Onkaparinga River at Clarendon Weir from early Tuesday morning. Lower Onkaparinga River below Mt Bold Reservoir: Minor flooding is possible along the Onkaparinga River at Clarendon Weir and Old Noarlunga. The Onkaparinga River at Clarendon Weir is currently at 11.08 m and rising, below the minor flood level. The Onkaparinga River at Clarendon Weir may exceed the minor flood level (11.20 m) early Tuesday morning. Further rises are possible. The Onkaparinga River at Old Noarlunga is currently at 4.82 m and rising, below the minor flood level. The Onkaparinga River at Old Noarlunga may reach around the minor flood level (5.00 m) Tuesday morning. Further rises are possible as upstream flows arrive. Flood Safety Advice: Don't drive, walk, swim or play in floodwater because it is dangerous. Stay away from flooded drains, rivers, streams and waterways. Obey road closure signs. Plan ahead so you don't drive on flooded roads. Check the ABC and local media for updates. The situation can change quickly, so stay informed. For local emergency management warnings and advice visit www.ses.sa.gov.au/incidents-and-warnings/incidents-and-warnings-map/.} For emergency assistance call SES on telephone number 132 500. In life-threatening emergencies, call 000 (triple zero) immediately. Next issue: The next warning will be issued by 02:00 PM ACST on Wednesday 26 August 2026. Latest River Heights: Onkaparinga River at Charleston,0.85,falling,7:25 am Tue 25/08/26 Onkaparinga River at Woodside,0.77,falling,7:11 am Tue 25/08/26 Western Branch Creek at Tiers Road,0.35,falling,7:28 am Tue 25/08/26 Lenswood Creek at Swamp Road,0.54,falling,7:29 am Tue 25/08/26 Onkaparinga River at Oakbank,0.79,falling,7:26 am Tue 25/08/26 Onkaparinga River at Verdun,3.02,falling,7:25 am Tue 25/08/26 Aldgate Creek at Aldgate (Euston Rd),0.72,steady,7:29 am Tue 25/08/26 Onkaparinga River at Houlgraves,5.83,steady,7:25 am Tue 25/08/26 Onkaparinga River at Clarendon Weir,11.08,rising,6:12 am Tue 25/08/26 Onkaparinga River at Old Noarlunga,4.82,rising,7:05 am Tue 25/08/26 This advice is also available by dialling 1300 659 219. Warning, rainfall and river information are available at http://www.bom.gov.au/australia/flood.