Reservoir · Tasmania · Australia · BOM Water Data Online
Lake Margaret
91.6% full
Capacity
16 hm³
Volume stored
15 hm³
Year completed
1918
Coordinates
41.991°S, 145.589°E
Last updated
2026-10-26
Current fill
91.6%vs 7 days ago
-3.0 pplosing
vs 1 year ago
-4.9 ppyear-over-year
7-day trend
↓falling
Drought context
Storage vs October average
97%of normal
91.6% full on 2026-10-26, against an average of 94.8% for October across 4 years of readings (-3.2 points).
Rain over the last three months · 11 October 2026
Moderately dry
In the three months to 11 October 2026 the area around Lake Margaret had well below normal rain, a shortfall seen about one year in six. Rainfall compared with the long-run record for the same season at this point (Copernicus Global Drought Observatory, SPI-3 index −1.02). 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. 41.991°S, 145.589°E · Open in Google Maps
About Lake Margaret
As of October 26, 2026, Lake Margaret is filled to 91.6% of its total capacity, holding 14.66 hm³ of water out of a maximum 16 hm³. At this level the reservoir is high. Of that total, 15.4 hm³ is usable (live) storage.
Over the most recent week on record the fill level has fallen by 3.0 percentage points, and it is 4.9 points below its level on the same date a year earlier.
Across the readings we hold for Lake Margaret — 1095 data points between October 28, 2023 and October 26, 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. It is at 41.991°S, 145.589°E.
Key facts
- Current fill level
- 91.6% of total capacity
- Water stored
- 14.66 hm³
- Total capacity
- 16 hm³
- Usable capacity
- 15.4 hm³
- 7-day change
- ▼ 3.0 pp
- Year-on-year
- ▼ 4.9 pp
- Primary use
- Water supply
- Year completed
- 1918
- Operator
- BOM
- Coordinates
- 41.991°S, 145.589°E
- Last updated
- October 26, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 26 Oct 2026 | 91.6% | 14.66 |
| 25 Oct 2026 | 91.6% | 14.66 |
| 24 Oct 2026 | 92.0% | 14.72 |
| 23 Oct 2026 | 92.6% | 14.81 |
| 22 Oct 2026 | 93.1% | 14.89 |
| 21 Oct 2026 | 93.6% | 14.97 |
| 20 Oct 2026 | 94.1% | 15.05 |
| 19 Oct 2026 | 94.6% | 15.14 |
| 18 Oct 2026 | 95.1% | 15.21 |
| 17 Oct 2026 | 95.4% | 15.27 |
| 16 Oct 2026 | 95.8% | 15.33 |
| 15 Oct 2026 | 96.1% | 15.38 |