Reservoir · Victoria · Australia · BOM Water Data Online
Blue Rock Lake
90.3% full
Capacity
198.3 hm³
Volume stored
179 hm³
River
Tanjil River
Year completed
1984
Coordinates
38.061°S, 146.200°E
Last updated
2026-10-26
Current fill
90.3%vs 7 days ago
+0.4 ppgaining
vs 1 year ago
+12.8 ppyear-over-year
7-day trend
→stable
Drought context
Storage vs October average
102%of normal
90.3% full on 2026-10-26, against an average of 88.7% for October across 4 years of readings (+1.6 points).
Rain over the last three months · 11 October 2026
Near normal
In the three months to 11 October 2026 the area around Blue Rock Lake 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 −0.81). 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: 2026-10-26.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 38.061°S, 146.200°E · Open in Google Maps
About Blue Rock Lake
As of October 26, 2026, Blue Rock Lake is filled to 90.3% of its total capacity, holding 179.1 hm³ of water out of a maximum 198.3 hm³. At this level the reservoir is high. Of that total, 197.6 hm³ is usable (live) storage.
Over the most recent week on record the fill level has held broadly steady (+0.4 pp), and it is 12.8 points above its level on the same date a year earlier.
Across the readings we hold for Blue Rock Lake — 1073 data points between October 28, 2023 and October 26, 2026 — the level has ranged from a low of 67.2% (June 24, 2025) to a high of 102.1% (January 9, 2024). 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
- 90.3% of total capacity
- Water stored
- 179.1 hm³
- Total capacity
- 198.3 hm³
- Usable capacity
- 197.6 hm³
- 7-day change
- ▲ 0.4 pp
- Year-on-year
- ▲ 12.8 pp
- 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
- October 26, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 26 Oct 2026 | 90.3% | 179.1 |
| 25 Oct 2026 | 90.1% | 178.59 |
| 24 Oct 2026 | 89.9% | 178.3 |
| 23 Oct 2026 | 89.9% | 178.24 |
| 22 Oct 2026 | 89.9% | 178.21 |
| 21 Oct 2026 | 89.9% | 178.24 |
| 20 Oct 2026 | 89.9% | 178.26 |
| 19 Oct 2026 | 89.9% | 178.22 |
| 18 Oct 2026 | 89.8% | 178.13 |
| 17 Oct 2026 | 89.8% | 178.03 |
| 16 Oct 2026 | 89.7% | 177.92 |
| 15 Oct 2026 | 89.6% | 177.68 |