Final Flood Warning for Onkaparinga River in South Australia
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BOM issues final flood warning for the Onkaparinga River; flooding no longer expected at Clarendon Weir and Old Noarlunga.
Read this weather record in 30 seconds
- Record type
- Flood Warning
- Affected area
- Onkaparinga River, South Australia
- Issued
- August 26, 2026
- Issuing authority
- BOM
Flood notices turn on location and timing. Treat the named area as this record's scope; do not assume nearby counties, parishes, or waterways were included.
Record status: publication date is recent, but current status is not stored on this page. Check the issuing agency's live warning service before acting because warnings can be updated, narrowed, or cancelled.
Alert Details
Final Flood Warning (type: flood_warning, warning_id: IDS20364) issued by the Australian Government Bureau of Meteorology (BOM). Issued at 11:03 am ACST on Wednesday 26 August 2026. This is warning number 6 and the final warning for the event; no further warnings will be issued.
Affected Areas
Lower Onkaparinga River below Mt Bold Reservoir, Onkaparinga River at Clarendon Weir, and Onkaparinga River at Old Noarlunga in South Australia (SA).
What You Should Do
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. 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 132 500. In life-threatening emergencies, call 000 (triple zero) immediately.
Expected Conditions
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 (11.20 m), and is currently at 10.26 m and steady. The Onkaparinga River at Old Noarlunga peaked at 4.93 m around 08:30 am Tuesday 25 August, below the minor flood level (5.00 m), and is currently at 2.55 m and steady. Mt Bold Reservoir remains around 94 percent full.
Timeline
Warning issued 2026-08-26T01:33:57Z and expires 2026-08-27T04:33:57Z. River levels along the Onkaparinga River peaked just below minor flood levels on Tuesday morning following heavy rain Monday into Tuesday.
Original source: BOM Official Notice ↗
Related Weather Warnings
All Weather Warnings →Nationwide notices with similar length or severity timing 8
Two Areazine-derived peer sets for this BoM weather warning: nearest notices by body length and by same severity near the same agency date. Peers come from other categories so they are not the same-feed Related list above.
Similar body length
Nearest notices by article body length (1,680 characters here).
Similar severity timing
Same severity (high) notices issued closest in time to August 26, 2026.
Frequently Asked Questions
Common questions about this BoM weather warning.