Reservoir · South Australia · Australia · BOM Water Data Online
Mount Bold
79.4% full
Capacity
46.4 hm³
Volume stored
37 hm³
River
Onkaparinga River
Year completed
1938
Coordinates
35.120°S, 138.701°E
Last updated
2026-10-24
Current fill
79.4%vs 7 days ago
-4.5 pplosing
vs 1 year ago
+8.0 ppyear-over-year
7-day trend
↓falling
Drought context
Storage vs October average
120%of normal
79.4% full on 2026-10-24, against an average of 66.0% for October across 4 years of readings (+13.4 points).
Rain over the last three months · 11 October 2026
Near normal
In the three months to 11 October 2026 the area around Mount Bold had rain close to 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 −0.16). 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: 2026-10-24.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 35.120°S, 138.701°E · Open in Google Maps
About Mount Bold
As of October 24, 2026, Mount Bold is filled to 79.4% of its total capacity, holding 36.85 hm³ of water out of a maximum 46.4 hm³. At this level the reservoir is within its normal operating range.
Over the most recent week on record the fill level has fallen by 4.5 percentage points, and it is 8.0 points above its level on the same date a year earlier.
Across the readings we hold for Mount Bold — 1092 data points between October 28, 2023 and October 24, 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
- 79.4% of total capacity
- Water stored
- 36.85 hm³
- Total capacity
- 46.4 hm³
- 7-day change
- ▼ 4.5 pp
- Year-on-year
- ▲ 8.0 pp
- 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
- October 24, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 24 Oct 2026 | 79.4% | 36.85 |
| 23 Oct 2026 | 80.1% | 37.16 |
| 22 Oct 2026 | 80.8% | 37.51 |
| 21 Oct 2026 | 81.5% | 37.83 |
| 20 Oct 2026 | 82.2% | 38.12 |
| 19 Oct 2026 | 82.7% | 38.39 |
| 18 Oct 2026 | 83.3% | 38.65 |
| 17 Oct 2026 | 83.9% | 38.91 |
| 16 Oct 2026 | 84.4% | 39.17 |
| 15 Oct 2026 | 85.0% | 39.43 |
| 14 Oct 2026 | 85.5% | 39.67 |
| 13 Oct 2026 | 86.0% | 39.9 |