Reservoir · South Australia · Australia · BOM Water Data Online
Lake Alexandrina
99.6% full
Capacity
1,644.9 hm³
Volume stored
1639 hm³
River
River Murray
Coordinates
35.449°S, 139.149°E
Last updated
2026-10-13
Current fill
99.6%vs 7 days ago
-2.7%losing
vs 1 year ago
-0.7%year-over-year
7-day trend
↓falling
Drought context
Storage vs October average
100%of normal
99.6% full on 2026-10-13, against an average of 99.9% for October across 4 years of readings (-0.3 points).
Rain over the last three months · 21 September 2026
Near normal
In the three months to 21 September 2026 the area around Lake Alexandrina had rain close to normal for the season. Rainfall compared with the long-run record for the same season at this point (Copernicus Global Drought Observatory, SPI-3 index +0.54). Rain, not storage. Australia drought figures →
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: 2026-10-13.
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 October 13, 2026, Lake Alexandrina is filled to 99.6% of its total capacity, holding roughly 1,639 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 fallen by 2.7 percentage points, and it sits close to where it was a year earlier.
Across the readings we hold for Lake Alexandrina — 1095 data points between October 15, 2023 and October 13, 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
- 99.6%
- Water stored
- 1,639 hm³
- Total capacity
- 1,645 hm³
- 7-day change
- ▼ 2.7 pts
- Year-on-year
- ▼ 0.7 pts
- Primary use
- Water supply
- River
- River Murray
- River basin
- River Murray Basin
- Operator
- BOM
- Coordinates
- 35.449°S, 139.149°E
- Last updated
- October 13, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 13 Oct 2026 | 99.6% | 1,639 |
| 12 Oct 2026 | 99.7% | 1,641 |
| 11 Oct 2026 | 100.1% | 1,646 |
| 10 Oct 2026 | 100.6% | 1,654 |
| 9 Oct 2026 | 101.0% | 1,662 |
| 8 Oct 2026 | 101.5% | 1,669 |
| 7 Oct 2026 | 101.9% | 1,676 |
| 6 Oct 2026 | 102.3% | 1,683 |
| 5 Oct 2026 | 102.5% | 1,687 |
| 4 Oct 2026 | 102.2% | 1,681 |
| 3 Oct 2026 | 101.4% | 1,669 |
| 2 Oct 2026 | 100.7% | 1,656 |