Reservoir · South Australia · Australia · BOM Water Data Online
Lake Alexandrina
99.4% full
Capacity
1,644.9 hm³
Volume stored
1635 hm³
River
River Murray
Coordinates
35.449°S, 139.149°E
Last updated
2026-09-08
Current fill
99.4%vs 7 days ago
+2.1%gaining
vs 1 year ago
-1.5%year-over-year
7-day trend
↑rising
Data source: Bureau of Meteorology — Water Data Online (KiWIS) — daily mean storage volume, quality-controlled. Capacity from the BOM Water Storages ArcGIS layer (total design capacity in ML). Last reading: 2026-09-08.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. -35.449, 139.149 · Open in Google Maps
About Lake Alexandrina
As of September 8, 2026, Lake Alexandrina is filled to 99.4% of its total capacity, holding roughly 1,635 hm³ of water out of a maximum 1,645 hm³. At this level the reservoir is high.
Over the most recent week on record the fill level has risen by 2.1 percentage points, and it is 1.5 points below its level on the same date a year earlier.
Across the readings we hold for Lake Alexandrina — 1095 data points between September 10, 2023 and September 8, 2026 — the level has ranged from a low of 87.9% (May 26, 2024) to a high of 108.9% (February 6, 2026). On average the reservoir is fullest around December and at its lowest around May.
It is operated by BOM primarily for water supply. It lies within the River Murray Basin basin at 35.449°S, 139.149°E.
Key facts
- Current fill level
- 99.4%
- Water stored
- 1,635 hm³
- Total capacity
- 1,645 hm³
- 7-day change
- ▲ 2.1 pts
- Year-on-year
- ▼ 1.5 pts
- Primary use
- Water supply
- River
- River Murray
- River basin
- River Murray Basin
- Operator
- BOM
- Coordinates
- 35.449°S, 139.149°E
- Last updated
- September 8, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 8 Sep 2026 | 99.4% | 1,635 |
| 7 Sep 2026 | 98.7% | 1,623 |
| 6 Sep 2026 | 98.0% | 1,613 |
| 5 Sep 2026 | 97.5% | 1,604 |
| 4 Sep 2026 | 97.1% | 1,597 |
| 3 Sep 2026 | 96.9% | 1,594 |
| 2 Sep 2026 | 97.0% | 1,596 |
| 1 Sep 2026 | 97.3% | 1,601 |
| 31 Aug 2026 | 97.6% | 1,606 |
| 30 Aug 2026 | 97.9% | 1,610 |
| 29 Aug 2026 | 98.2% | 1,614 |
| 28 Aug 2026 | 98.3% | 1,616 |