Reservoir · Victoria · Australia · BOM Water Data Online
Blue Rock Lake
86.3% full
Capacity
198.3 hm³
Volume stored
171 hm³
River
Tanjil River
Year completed
1984
Coordinates
38.061°S, 146.200°E
Last updated
2026-09-08
Current fill
86.3%vs 7 days ago
+0.4%gaining
vs 1 year ago
+11.4%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: 2026-09-08.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. -38.061, 146.200 · Open in Google Maps
About Blue Rock Lake
As of September 8, 2026, Blue Rock Lake is filled to 86.3% of its total capacity, holding roughly 171 hm³ of water out of a maximum 198 hm³. At this level the reservoir is high. Of that total, about 198 hm³ is usable (live) storage.
Over the most recent week on record the fill level has held broadly steady (+0.4 pts), and it is 11.4 points above its level on the same date a year earlier.
Across the readings we hold for Blue Rock Lake — 1070 data points between September 11, 2023 and September 8, 2026 — the level has ranged from a low of 67.2% (June 24, 2025) to a high of 103.4% (October 5, 2023). On average the reservoir is fullest around November and at its lowest around May.
The dam at Blue Rock Lake was completed in 1984. It is operated by BOM primarily for water supply. It lies within the Tanjil River Basin basin at 38.061°S, 146.200°E.
Key facts
- Current fill level
- 86.3%
- Water stored
- 171 hm³
- Total capacity
- 198 hm³
- Usable capacity
- 198 hm³
- 7-day change
- ▲ 0.4 pts
- Year-on-year
- ▲ 11.4 pts
- Primary use
- Water supply
- River
- Tanjil River
- River basin
- Tanjil River Basin
- Year completed
- 1984
- Operator
- BOM
- Coordinates
- 38.061°S, 146.200°E
- Last updated
- September 8, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 8 Sep 2026 | 86.3% | 171 |
| 7 Sep 2026 | 86.2% | 171 |
| 6 Sep 2026 | 86.1% | 171 |
| 5 Sep 2026 | 86.0% | 170 |
| 4 Sep 2026 | 85.9% | 170 |
| 3 Sep 2026 | 85.8% | 170 |
| 2 Sep 2026 | 85.8% | 170 |
| 1 Sep 2026 | 85.9% | 170 |
| 31 Aug 2026 | 85.8% | 170 |
| 30 Aug 2026 | 85.8% | 170 |
| 29 Aug 2026 | 85.7% | 170 |
| 28 Aug 2026 | 85.6% | 170 |