Reservoir · South Australia · Australia · BOM Water Data Online
Mount Bold
94.1% full
Capacity
46.4 hm³
Volume stored
44 hm³
River
Onkaparinga River
Year completed
1938
Coordinates
35.120°S, 138.701°E
Last updated
2026-09-05
Current fill
94.1%vs 7 days ago
-0.2%losing
vs 1 year ago
+28.4%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: 2026-09-05.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. -35.120, 138.701 · Open in Google Maps
About Mount Bold
As of September 5, 2026, Mount Bold is filled to 94.1% of its total capacity, holding roughly 44 hm³ of water out of a maximum 46 hm³. At this level the reservoir is high.
Over the most recent week on record the fill level has held broadly steady (-0.2 pts), and it is 28.4 points above its level on the same date a year earlier.
Across the readings we hold for Mount Bold — 1090 data points between September 11, 2023 and September 5, 2026 — the level has ranged from a low of 21.0% (May 31, 2025) to a high of 94.6% (August 25, 2026). On average the reservoir is fullest around September and at its lowest around June.
The dam at Mount Bold was completed in 1938. It is operated by BOM primarily for water supply. It lies within the Onkaparinga River Basin basin at 35.120°S, 138.701°E.
Key facts
- Current fill level
- 94.1%
- Water stored
- 44 hm³
- Total capacity
- 46 hm³
- 7-day change
- ▼ 0.2 pts
- Year-on-year
- ▲ 28.4 pts
- Primary use
- Water supply
- River
- Onkaparinga River
- River basin
- Onkaparinga River Basin
- Year completed
- 1938
- Operator
- BOM
- Coordinates
- 35.120°S, 138.701°E
- Last updated
- September 5, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 5 Sep 2026 | 94.1% | 44 |
| 4 Sep 2026 | 94.0% | 44 |
| 3 Sep 2026 | 94.0% | 44 |
| 2 Sep 2026 | 94.0% | 44 |
| 1 Sep 2026 | 94.1% | 44 |
| 31 Aug 2026 | 94.1% | 44 |
| 30 Aug 2026 | 94.2% | 44 |
| 29 Aug 2026 | 94.3% | 44 |
| 28 Aug 2026 | 94.3% | 44 |
| 27 Aug 2026 | 94.4% | 44 |
| 26 Aug 2026 | 94.3% | 44 |
| 25 Aug 2026 | 94.6% | 44 |