Reservoir · South Australia · Australia · BOM Water Data Online
Lake Alexandrina
97.8% full
Capacity
1,644.9 hm³
Volume stored
1609 hm³
River
River Murray
Coordinates
35.449°S, 139.149°E
Last updated
2026-07-28
Current fill
97.8%vs 7 days ago
-0.1%losing
vs 1 year ago
+3.1%year-over-year
7-day trend
→stable
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: 2026-07-28.
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 July 28, 2026, Lake Alexandrina is filled to 97.8% of its total capacity, holding roughly 1,609 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 held broadly steady (-0.1 pts), and it is 3.1 points above its level on the same date a year earlier.
Across the readings we hold for Lake Alexandrina — 1095 data points between July 30, 2023 and July 28, 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
- 97.8%
- Water stored
- 1,609 hm³
- Total capacity
- 1,645 hm³
- 7-day change
- ▼ 0.1 pts
- Year-on-year
- ▲ 3.1 pts
- Primary use
- Water supply
- River
- River Murray
- River basin
- River Murray Basin
- Operator
- BOM
- Coordinates
- 35.449°S, 139.149°E
- Last updated
- July 28, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 28 Jul 2026 | 97.8% | 1,609 |
| 27 Jul 2026 | 97.9% | 1,611 |
| 26 Jul 2026 | 98.0% | 1,613 |
| 25 Jul 2026 | 98.1% | 1,614 |
| 24 Jul 2026 | 98.1% | 1,614 |
| 23 Jul 2026 | 98.0% | 1,613 |
| 22 Jul 2026 | 98.1% | 1,613 |
| 21 Jul 2026 | 98.2% | 1,615 |
| 20 Jul 2026 | 98.4% | 1,618 |
| 19 Jul 2026 | 98.6% | 1,621 |
| 18 Jul 2026 | 98.7% | 1,623 |
| 17 Jul 2026 | 98.7% | 1,623 |
Frequently asked questions
What is the current water level of Lake Alexandrina?
As of July 28, 2026, Lake Alexandrina is at 97.8% of its capacity, holding approximately 1,609 hm³ of water, according to BOM data.
Is Lake Alexandrina reservoir full?
Lake Alexandrina is essentially full, sitting at 97.8% of capacity as of July 28, 2026.
Is the water level at Lake Alexandrina rising or falling?
The level at Lake Alexandrina has been broadly stable over the latest week on record (-0.1 points).
How much water can Lake Alexandrina hold?
Lake Alexandrina has a total capacity of 1,645 hm³.
Where is Lake Alexandrina reservoir located?
Lake Alexandrina is located in South Australia, Australia, within the River Murray Basin basin (coordinates 35.449°S, 139.149°E).
What is Lake Alexandrina used for?
Lake Alexandrina is used primarily for water supply, and is managed by BOM.