Reservoir · South Australia · Australia · BOM Water Data Online
Mount Bold
70.3% full
Capacity
46.4 hm³
Volume stored
33 hm³
River
Onkaparinga River
Year completed
1938
Coordinates
35.120°S, 138.701°E
Last updated
2026-07-25
Current fill
70.3%vs 7 days ago
-0.2%losing
vs 1 year ago
+37.2%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: 2026-07-25.
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 July 25, 2026, Mount Bold is filled to 70.3% of its total capacity, holding roughly 33 hm³ of water out of a maximum 46 hm³. At this level the reservoir is within its normal operating range.
Over the most recent week on record the fill level has held broadly steady (-0.2 pts), and it is 37.2 points above its level on the same date a year earlier.
Across the readings we hold for Mount Bold — 1091 data points between July 30, 2023 and July 25, 2026 — the level has ranged from a low of 21.0% (May 31, 2025) to a high of 79.3% (September 14, 2023). On average the reservoir is fullest around October 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
- 70.3%
- Water stored
- 33 hm³
- Total capacity
- 46 hm³
- 7-day change
- ▼ 0.2 pts
- Year-on-year
- ▲ 37.2 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
- July 25, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 25 Jul 2026 | 70.3% | 33 |
| 24 Jul 2026 | 70.5% | 33 |
| 23 Jul 2026 | 70.6% | 33 |
| 22 Jul 2026 | 70.8% | 33 |
| 21 Jul 2026 | 70.9% | 33 |
| 20 Jul 2026 | 71.0% | 33 |
| 19 Jul 2026 | 70.9% | 33 |
| 18 Jul 2026 | 70.7% | 33 |
| 17 Jul 2026 | 70.5% | 33 |
| 16 Jul 2026 | 70.0% | 32 |
| 15 Jul 2026 | 69.1% | 32 |
| 14 Jul 2026 | 66.8% | 31 |
Frequently asked questions
What is the current water level of Mount Bold?
As of July 25, 2026, Mount Bold is at 70.3% of its capacity, holding approximately 33 hm³ of water, according to BOM data.
Is Mount Bold reservoir full?
No. As of July 25, 2026, Mount Bold is within its normal operating range at 70.3% of its capacity, so it is not full.
Is the water level at Mount Bold rising or falling?
The level at Mount Bold has been broadly stable over the latest week on record (-0.2 points).
How much water can Mount Bold hold?
Mount Bold has a total capacity of 46 hm³.
Where is Mount Bold reservoir located?
Mount Bold is located in South Australia, Australia, within the Onkaparinga River Basin basin (coordinates 35.120°S, 138.701°E).
When was Mount Bold dam built?
The dam at Mount Bold was completed in 1938.
What is Mount Bold used for?
Mount Bold is used primarily for water supply, and is managed by BOM.