Reservoir · Tasmania · Australia · BOM Water Data Online
Lake Margaret
95.7% full
Capacity
16 hm³
Volume stored
15 hm³
Year completed
1918
Coordinates
41.991°S, 145.589°E
Last updated
2026-10-12
Current fill
95.7%vs 7 days ago
+0.6%gaining
vs 1 year ago
-1.4%year-over-year
7-day trend
→stable
Drought context
Storage vs October average
101%of normal
95.7% full on 2026-10-12, against an average of 95.0% for October across 4 years of readings (+0.7 points).
Rain over the last three months · 21 September 2026
Near normal
In the three months to 21 September 2026 the area around Lake Margaret 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 −0.53). 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: 2026-10-12.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. -41.991, 145.589 · Open in Google Maps
About Lake Margaret
As of October 12, 2026, Lake Margaret is filled to 95.7% of its total capacity, holding roughly 15 hm³ of water out of a maximum 16 hm³. At this level the reservoir is high. Of that total, about 15 hm³ is usable (live) storage.
Over the most recent week on record the fill level has held broadly steady (+0.6 pts), and it is 1.4 points below its level on the same date a year earlier.
Across the readings we hold for Lake Margaret — 1094 data points between October 15, 2023 and October 12, 2026 — the level has ranged from a low of 60.4% (January 17, 2024) to a high of 100.2% (July 25, 2026). On average the reservoir is fullest around September and at its lowest around February.
The dam at Lake Margaret was completed in 1918. It is operated by BOM primarily for water supply.
Key facts
- Current fill level
- 95.7%
- Water stored
- 15 hm³
- Total capacity
- 16 hm³
- Usable capacity
- 15 hm³
- 7-day change
- ▲ 0.6 pts
- Year-on-year
- ▼ 1.4 pts
- Primary use
- Water supply
- Year completed
- 1918
- Operator
- BOM
- Coordinates
- 41.991°S, 145.589°E
- Last updated
- October 12, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 12 Oct 2026 | 95.7% | 15 |
| 11 Oct 2026 | 94.8% | 15 |
| 10 Oct 2026 | 95.0% | 15 |
| 9 Oct 2026 | 95.2% | 15 |
| 8 Oct 2026 | 95.5% | 15 |
| 7 Oct 2026 | 95.6% | 15 |
| 6 Oct 2026 | 95.1% | 15 |
| 5 Oct 2026 | 95.1% | 15 |
| 4 Oct 2026 | 95.4% | 15 |
| 3 Oct 2026 | 95.7% | 15 |
| 2 Oct 2026 | 96.0% | 15 |
| 1 Oct 2026 | 96.1% | 15 |