Reservoir · South Australia · Australia · BOM Water Data Online
Lock 1 - Blanchetown
50.6% full
Capacity
56.5 hm³
Volume stored
29 hm³
River
River Murray
Year completed
1922
Coordinates
34.327°S, 139.618°E
Last updated
2026-10-28
Current fill
50.6%vs 7 days ago
+0.7 ppgaining
vs 1 year ago
-0.4 ppyear-over-year
7-day trend
→stable
Drought context
Storage vs October average
100%of normal
50.6% full on 2026-10-28, against an average of 50.4% for October across 4 years of readings (+0.2 points).
Rain over the last three months · 11 October 2026
Moderately wet
In the three months to 11 October 2026 the area around Lock 1 - Blanchetown had more rain than 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 +1.12). 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: 2026-10-28.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 34.327°S, 139.618°E · Open in Google Maps
About Lock 1 - Blanchetown
As of October 28, 2026, Lock 1 - Blanchetown is filled to 50.6% of its total capacity, holding 28.6 hm³ of water out of a maximum 56.5 hm³. At this level the reservoir is within its normal operating range. Of that total, 27.9 hm³ is usable (live) storage.
Over the most recent week on record the fill level has held broadly steady (+0.7 pp), and it sits close to where it was a year earlier.
Across the readings we hold for Lock 1 - Blanchetown — 1095 data points between October 30, 2023 and October 28, 2026 — the level has ranged from a low of 47.2% (March 26, 2024) to a high of 51.9% (February 3, 2024). On average the reservoir is fullest around October 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
- 50.6% of total capacity
- Water stored
- 28.6 hm³
- Total capacity
- 56.5 hm³
- Usable capacity
- 27.9 hm³
- 7-day change
- ▲ 0.7 pp
- Year-on-year
- ▼ 0.4 pp
- 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
- October 28, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 28 Oct 2026 | 50.6% | 28.6 |
| 27 Oct 2026 | 50.6% | 28.59 |
| 26 Oct 2026 | 50.5% | 28.52 |
| 25 Oct 2026 | 50.1% | 28.3 |
| 24 Oct 2026 | 49.9% | 28.17 |
| 23 Oct 2026 | 50.0% | 28.22 |
| 22 Oct 2026 | 50.2% | 28.33 |
| 21 Oct 2026 | 49.9% | 28.18 |
| 20 Oct 2026 | 49.6% | 28.01 |
| 19 Oct 2026 | 49.6% | 28.04 |
| 18 Oct 2026 | 49.8% | 28.11 |
| 17 Oct 2026 | 49.8% | 28.13 |