Reservoir · South Australia · Australia · BOM Water Data Online
Lock 1 - Blanchetown
50.4% full
Capacity
56.5 hm³
Volume stored
29 hm³
River
River Murray
Year completed
1922
Coordinates
34.327°S, 139.618°E
Last updated
2026-07-28
Current fill
50.4%vs 7 days ago
-0.3%losing
vs 1 year ago
+0.1%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. -34.327, 139.618 · Open in Google Maps
About Lock 1 - Blanchetown
As of July 28, 2026, Lock 1 - Blanchetown is filled to 50.4% of its total capacity, holding roughly 29 hm³ of water out of a maximum 57 hm³. At this level the reservoir is within its normal operating range. Of that total, about 28 hm³ is usable (live) storage.
Over the most recent week on record the fill level has held broadly steady (-0.3 pts), and it sits close to where it was a year earlier.
Across the readings we hold for Lock 1 - Blanchetown — 1095 data points between July 30, 2023 and July 28, 2026 — the level has ranged from a low of 47.2% (March 26, 2024) to a high of 52.9% (September 20, 2023). On average the reservoir is fullest around September and at its lowest around March.
The dam at Lock 1 - Blanchetown was completed in 1922. It is operated by BOM primarily for water supply. It lies within the River Murray Basin basin at 34.327°S, 139.618°E.
Key facts
- Current fill level
- 50.4%
- Water stored
- 29 hm³
- Total capacity
- 57 hm³
- Usable capacity
- 28 hm³
- 7-day change
- ▼ 0.3 pts
- Year-on-year
- ▲ 0.1 pts
- Primary use
- Water supply
- River
- River Murray
- River basin
- River Murray Basin
- Year completed
- 1922
- Operator
- BOM
- Coordinates
- 34.327°S, 139.618°E
- Last updated
- July 28, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 28 Jul 2026 | 50.4% | 28 |
| 27 Jul 2026 | 50.7% | 29 |
| 26 Jul 2026 | 50.8% | 29 |
| 25 Jul 2026 | 50.5% | 29 |
| 24 Jul 2026 | 50.4% | 28 |
| 23 Jul 2026 | 50.4% | 28 |
| 22 Jul 2026 | 50.4% | 28 |
| 21 Jul 2026 | 50.6% | 29 |
| 20 Jul 2026 | 50.8% | 29 |
| 19 Jul 2026 | 50.9% | 29 |
| 18 Jul 2026 | 50.6% | 29 |
| 17 Jul 2026 | 50.2% | 28 |
Frequently asked questions
What is the current water level of Lock 1 - Blanchetown?
As of July 28, 2026, Lock 1 - Blanchetown is at 50.4% of its capacity, holding approximately 29 hm³ of water, according to BOM data.
Is Lock 1 - Blanchetown reservoir full?
No. As of July 28, 2026, Lock 1 - Blanchetown is within its normal operating range at 50.4% of its capacity, so it is not full.
Is the water level at Lock 1 - Blanchetown rising or falling?
The level at Lock 1 - Blanchetown has been broadly stable over the latest week on record (-0.3 points).
How much water can Lock 1 - Blanchetown hold?
Lock 1 - Blanchetown has a total capacity of 57 hm³, of which about 28 hm³ is usable storage.
Where is Lock 1 - Blanchetown reservoir located?
Lock 1 - Blanchetown is located in South Australia, Australia, within the River Murray Basin basin (coordinates 34.327°S, 139.618°E).
When was Lock 1 - Blanchetown dam built?
The dam at Lock 1 - Blanchetown was completed in 1922.
What is Lock 1 - Blanchetown used for?
Lock 1 - Blanchetown is used primarily for water supply, and is managed by BOM.