Reservoir · Victoria · Australia · BOM Water Data Online
Blue Rock Lake
82.7% full
Capacity
198.3 hm³
Volume stored
164 hm³
River
Tanjil River
Year completed
1984
Coordinates
38.061°S, 146.200°E
Last updated
2026-07-29
Current fill
82.7%vs 7 days ago
+0.1%gaining
vs 1 year ago
+3.8%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: 2026-07-29.
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 July 29, 2026, Blue Rock Lake is filled to 82.7% of its total capacity, holding roughly 164 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 (+0.1 pts), and it is 3.8 points above its level on the same date a year earlier.
Across the readings we hold for Blue Rock Lake — 1072 data points between July 30, 2023 and July 29, 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
- 82.7%
- Water stored
- 164 hm³
- Total capacity
- 198 hm³
- Usable capacity
- 198 hm³
- 7-day change
- ▲ 0.1 pts
- Year-on-year
- ▲ 3.8 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
- July 29, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 29 Jul 2026 | 82.7% | 164 |
| 28 Jul 2026 | 82.6% | 164 |
| 27 Jul 2026 | 82.5% | 164 |
| 26 Jul 2026 | 82.4% | 163 |
| 25 Jul 2026 | 82.4% | 163 |
| 24 Jul 2026 | 82.4% | 163 |
| 23 Jul 2026 | 82.3% | 163 |
| 22 Jul 2026 | 82.2% | 163 |
| 21 Jul 2026 | 82.2% | 163 |
| 20 Jul 2026 | 82.2% | 163 |
| 19 Jul 2026 | 82.1% | 163 |
| 18 Jul 2026 | 82.0% | 163 |
Frequently asked questions
What is the current water level of Blue Rock Lake?
As of July 29, 2026, Blue Rock Lake is at 82.7% of its capacity, holding approximately 164 hm³ of water, according to BOM data.
Is Blue Rock Lake reservoir full?
No. As of July 29, 2026, Blue Rock Lake is high at 82.7% of its capacity, so it is not full.
Is the water level at Blue Rock Lake rising or falling?
The level at Blue Rock Lake has been broadly stable over the latest week on record (+0.1 points).
How much water can Blue Rock Lake hold?
Blue Rock Lake has a total capacity of 198 hm³, of which about 198 hm³ is usable storage.
Where is Blue Rock Lake reservoir located?
Blue Rock Lake is located in Victoria, Australia, within the Tanjil River Basin basin (coordinates 38.061°S, 146.200°E).
When was Blue Rock Lake dam built?
The dam at Blue Rock Lake was completed in 1984.
What is Blue Rock Lake used for?
Blue Rock Lake is used primarily for water supply, and is managed by BOM.