Reservoir · Victoria · Australia · BOM Water Data Online
O'Shannassy
100.6% full
Capacity
3.1 hm³
Volume stored
3 hm³
River
O'Shannassy River
Year completed
1928
Coordinates
37.673°S, 145.808°E
Last updated
2026-09-07
Current fill
100.6%vs 7 days ago
+0.2%gaining
vs 1 year ago
-0.6%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: 2026-09-07.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. -37.673, 145.808 · Open in Google Maps
About O'Shannassy
As of September 7, 2026, O'Shannassy is filled to 100.6% of its total capacity, holding roughly 3 hm³ of water out of a maximum 3 hm³. At this level the reservoir is effectively full.
Over the most recent week on record the fill level has held broadly steady (+0.2 pts), and it sits close to where it was a year earlier.
Across the readings we hold for O'Shannassy — 1061 data points between September 10, 2023 and September 7, 2026 — the level has ranged from a low of 50.7% (April 24, 2025) to a high of 106.1% (October 4, 2023). On average the reservoir is fullest around August and at its lowest around May.
The dam at O'Shannassy was completed in 1928. It is operated by BOM primarily for water supply. It lies within the O'Shannassy River Basin basin at 37.673°S, 145.808°E.
Key facts
- Current fill level
- 100.6%
- Water stored
- 3 hm³
- Total capacity
- 3 hm³
- 7-day change
- ▲ 0.2 pts
- Year-on-year
- ▼ 0.6 pts
- Primary use
- Water supply
- River
- O'Shannassy River
- River basin
- O'Shannassy River Basin
- Year completed
- 1928
- Operator
- BOM
- Coordinates
- 37.673°S, 145.808°E
- Last updated
- September 7, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 7 Sep 2026 | 100.6% | 3 |
| 6 Sep 2026 | 99.6% | 3 |
| 5 Sep 2026 | 99.2% | 3 |
| 4 Sep 2026 | 99.2% | 3 |
| 3 Sep 2026 | 99.4% | 3 |
| 2 Sep 2026 | 99.8% | 3 |
| 1 Sep 2026 | 100.1% | 3 |
| 31 Aug 2026 | 100.4% | 3 |
| 30 Aug 2026 | 100.6% | 3 |
| 29 Aug 2026 | 100.8% | 3 |
| 28 Aug 2026 | 101.0% | 3 |
| 27 Aug 2026 | 101.2% | 3 |