Reservoir · South Australia · Australia · BOM Water Data Online
Lock 4 - Bookpurnong
71.0% full
Capacity
29.4 hm³
Volume stored
21 hm³
River
River Murray
Year completed
1929
Coordinates
34.337°S, 140.577°E
Last updated
2026-07-28
Current fill
71.0%vs 7 days ago
-0.4%losing
vs 1 year ago
+0.8%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. -34.337, 140.577 · Open in Google Maps
About Lock 4 - Bookpurnong
As of July 28, 2026, Lock 4 - Bookpurnong is filled to 71.0% of its total capacity, holding roughly 21 hm³ of water out of a maximum 29 hm³. At this level the reservoir is within its normal operating range. Of that total, about 21 hm³ is usable (live) storage.
Over the most recent week on record the fill level has held broadly steady (-0.4 pts), and it sits close to where it was a year earlier.
Across the readings we hold for Lock 4 - Bookpurnong — 1095 data points between July 30, 2023 and July 28, 2026 — the level has ranged from a low of 65.5% (September 18, 2023) to a high of 79.8% (September 7, 2023). On average the reservoir is fullest around September 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
- 71.0%
- Water stored
- 21 hm³
- Total capacity
- 29 hm³
- Usable capacity
- 21 hm³
- 7-day change
- ▼ 0.4 pts
- Year-on-year
- ▲ 0.8 pts
- 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
- July 28, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 28 Jul 2026 | 71.0% | 21 |
| 27 Jul 2026 | 71.4% | 21 |
| 26 Jul 2026 | 71.3% | 21 |
| 25 Jul 2026 | 71.1% | 21 |
| 24 Jul 2026 | 71.4% | 21 |
| 23 Jul 2026 | 71.6% | 21 |
| 22 Jul 2026 | 71.4% | 21 |
| 21 Jul 2026 | 71.2% | 21 |
| 20 Jul 2026 | 71.0% | 21 |
| 19 Jul 2026 | 70.5% | 21 |
| 18 Jul 2026 | 70.1% | 21 |
| 17 Jul 2026 | 70.0% | 21 |
Frequently asked questions
What is the current water level of Lock 4 - Bookpurnong?
As of July 28, 2026, Lock 4 - Bookpurnong is at 71.0% of its capacity, holding approximately 21 hm³ of water, according to BOM data.
Is Lock 4 - Bookpurnong reservoir full?
No. As of July 28, 2026, Lock 4 - Bookpurnong is within its normal operating range at 71.0% of its capacity, so it is not full.
Is the water level at Lock 4 - Bookpurnong rising or falling?
The level at Lock 4 - Bookpurnong has been broadly stable over the latest week on record (-0.4 points).
How much water can Lock 4 - Bookpurnong hold?
Lock 4 - Bookpurnong has a total capacity of 29 hm³, of which about 21 hm³ is usable storage.
Where is Lock 4 - Bookpurnong reservoir located?
Lock 4 - Bookpurnong is located in South Australia, Australia, within the River Murray Basin basin (coordinates 34.337°S, 140.577°E).
When was Lock 4 - Bookpurnong dam built?
The dam at Lock 4 - Bookpurnong was completed in 1929.
What is Lock 4 - Bookpurnong used for?
Lock 4 - Bookpurnong is used primarily for water supply, and is managed by BOM.