Australian Government Bureau of Meteorology, National Water Operations Final Flood Warning For The Onkaparinga River Issued at 11:03 AM ACST on Wednesday 26 August 2026 Flood Warning Number: 6 FLOODING NO LONGER EXPECTED AT CLARENDON WEIR AND OLD NOARLUNGA River levels along the Onkaparinga River peaked just below the minor flood levels on Tuesday morning following heavy rain Monday into Tuesday. Flooding is no longer expected. Mt Bold Reservoir remains around 94 percent full. Lower Onkaparinga River below Mt Bold Reservoir: Flooding is no longer expected along the Onkaparinga River. The Onkaparinga River at Clarendon Weir peaked at 11.10 m around 08:15 am Tuesday 25 August, just below the minor flood level. The river is currently at 10.26 m and steady, below the minor flood level. The Onkaparinga River at Clarendon Weir is expected to remain below the minor flood level (11.20 m). Flooding is no longer expected. The Onkaparinga River at Old Noarlunga peaked at 4.93 m around 08:30 am Tuesday 25 August, below the minor flood level. The river is currently at 2.55 m and steady, below the minor flood level. The Onkaparinga River at Old Noarlunga is expected to remain below the minor flood level (5.00 m). Flooding is no longer expected. 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: This is a final warning. No further warnings will be issued for this event. Latest River Heights: Onkaparinga River at Charleston,0.25,steady,10:47 am Wed 26/08/26 Onkaparinga River at Woodside,0.39,steady,9:46 am Wed 26/08/26 Western Branch Creek at Tiers Road,0.15,steady,8:41 am Wed 26/08/26 Lenswood Creek at Swamp Road,0.35,steady,10:19 am Wed 26/08/26 Onkaparinga River at Oakbank,0.39,steady,9:06 am Wed 26/08/26 Onkaparinga River at Verdun,0.71,falling,10:55 am Wed 26/08/26 Aldgate Creek at Aldgate (Euston Rd),0.50,steady,10:52 am Wed 26/08/26 Onkaparinga River at Houlgraves,4.12,steady,10:55 am Wed 26/08/26 Onkaparinga River at Clarendon Weir,10.26,steady,9:12 am Wed 26/08/26 Onkaparinga River at Old Noarlunga,2.55,steady,10:15 am Wed 26/08/26 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.