Reservoir · Victoria · Australia · BOM Water Data Online
Lake Lonsdale
57.4% full
Capacity
53.3 hm³
Volume stored
31 hm³
River
Mt William Creek
Year completed
1903
Coordinates
37.029°S, 142.628°E
Last updated
2026-09-09
Current fill
57.4%vs 7 days ago
+2.9%gaining
vs 1 year ago
+29.4%year-over-year
7-day trend
↑rising
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: 2026-09-09.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. -37.029, 142.628 · Open in Google Maps
About Lake Lonsdale
As of September 9, 2026, Lake Lonsdale is filled to 57.4% of its total capacity, holding roughly 31 hm³ of water out of a maximum 53 hm³. At this level the reservoir is within its normal operating range. Of that total, about 51 hm³ is usable (live) storage.
Over the most recent week on record the fill level has risen by 2.9 percentage points, and it is 29.4 points above its level on the same date a year earlier.
Across the readings we hold for Lake Lonsdale — 1096 data points between September 10, 2023 and September 9, 2026 — the level has ranged from a low of 11.1% (May 7, 2026) to a high of 100.7% (September 13, 2023). On average the reservoir is fullest around October and at its lowest around May.
The dam at Lake Lonsdale was completed in 1903. It is operated by BOM primarily for water supply. It lies within the Mt William Creek Basin basin at 37.029°S, 142.628°E.
Key facts
- Current fill level
- 57.4%
- Water stored
- 31 hm³
- Total capacity
- 53 hm³
- Usable capacity
- 51 hm³
- 7-day change
- ▲ 2.9 pts
- Year-on-year
- ▲ 29.4 pts
- Primary use
- Water supply
- River
- Mt William Creek
- River basin
- Mt William Creek Basin
- Year completed
- 1903
- Operator
- BOM
- Coordinates
- 37.029°S, 142.628°E
- Last updated
- September 9, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 9 Sep 2026 | 57.4% | 31 |
| 8 Sep 2026 | 57.1% | 30 |
| 7 Sep 2026 | 56.6% | 30 |
| 6 Sep 2026 | 55.7% | 30 |
| 5 Sep 2026 | 55.1% | 29 |
| 4 Sep 2026 | 54.9% | 29 |
| 3 Sep 2026 | 54.6% | 29 |
| 2 Sep 2026 | 54.5% | 29 |
| 1 Sep 2026 | 54.5% | 29 |
| 31 Aug 2026 | 54.3% | 29 |
| 30 Aug 2026 | 54.1% | 29 |
| 29 Aug 2026 | 53.8% | 29 |