Reservoir · South Australia · Australia · BOM Water Data Online
Lock 4 - Bookpurnong
79.6% full
Capacity
29.4 hm³
Volume stored
23 hm³
River
River Murray
Year completed
1929
Coordinates
34.337°S, 140.577°E
Last updated
2026-10-26
Current fill
79.6%vs 7 days ago
+1.8 ppgaining
vs 1 year ago
+3.0 ppyear-over-year
7-day trend
↑rising
Drought context
Storage vs October average
107%of normal
79.6% full on 2026-10-26, against an average of 74.7% for October across 4 years of readings (+4.9 points).
Rain over the last three months · 11 October 2026
Moderately wet
In the three months to 11 October 2026 the area around Lock 4 - Bookpurnong 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: 2026-10-26.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 34.337°S, 140.577°E · Open in Google Maps
About Lock 4 - Bookpurnong
As of October 26, 2026, Lock 4 - Bookpurnong is filled to 79.6% of its total capacity, holding 23.39 hm³ of water out of a maximum 29.4 hm³. At this level the reservoir is within its normal operating range. Of that total, 20.6 hm³ is usable (live) storage.
Over the most recent week on record the fill level has risen by 1.8 percentage points, and it is 3.0 points above its level on the same date a year earlier.
Across the readings we hold for Lock 4 - Bookpurnong — 1095 data points between October 28, 2023 and October 26, 2026 — the level has ranged from a low of 68.6% (June 28, 2024) to a high of 79.6% (October 26, 2026). On average the reservoir is fullest around October and at its lowest around June.
The dam at Lock 4 - Bookpurnong was completed in 1929. It is operated by BOM primarily for water supply. It lies within the River Murray Basin basin at 34.337°S, 140.577°E.
Key facts
- Current fill level
- 79.6% of total capacity
- Water stored
- 23.39 hm³
- Total capacity
- 29.4 hm³
- Usable capacity
- 20.6 hm³
- 7-day change
- ▲ 1.8 pp
- Year-on-year
- ▲ 3.0 pp
- Primary use
- Water supply
- River
- River Murray
- River basin
- River Murray Basin
- Year completed
- 1929
- Operator
- BOM
- Coordinates
- 34.337°S, 140.577°E
- Last updated
- October 26, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 26 Oct 2026 | 79.6% | 23.39 |
| 25 Oct 2026 | 78.8% | 23.15 |
| 24 Oct 2026 | 77.7% | 22.83 |
| 23 Oct 2026 | 77.3% | 22.7 |
| 22 Oct 2026 | 76.9% | 22.58 |
| 21 Oct 2026 | 76.7% | 22.51 |
| 20 Oct 2026 | 77.1% | 22.65 |
| 19 Oct 2026 | 77.8% | 22.85 |
| 18 Oct 2026 | 78.3% | 23 |
| 17 Oct 2026 | 78.6% | 23.08 |
| 16 Oct 2026 | 78.6% | 23.1 |
| 15 Oct 2026 | 78.6% | 23.09 |