Reservoir · Tasmania · Australia · BOM Water Data Online
Lake Margaret
96.8% full
Capacity
16 hm³
Volume stored
16 hm³
Year completed
1918
Coordinates
41.991°S, 145.589°E
Last updated
2026-07-28
Current fill
96.8%vs 7 days ago
-0.5%losing
vs 1 year ago
+0.6%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: 2026-07-28.
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 July 28, 2026, Lake Margaret is filled to 96.8% of its total capacity, holding roughly 16 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 (-0.5 pts), and it sits close to where it was a year earlier.
Across the readings we hold for Lake Margaret — 1095 data points between July 30, 2023 and July 28, 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
- 96.8%
- Water stored
- 16 hm³
- Total capacity
- 16 hm³
- Usable capacity
- 15 hm³
- 7-day change
- ▼ 0.5 pts
- Year-on-year
- ▲ 0.6 pts
- Primary use
- Water supply
- Year completed
- 1918
- Operator
- BOM
- Coordinates
- 41.991°S, 145.589°E
- Last updated
- July 28, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 28 Jul 2026 | 96.8% | 15 |
| 27 Jul 2026 | 97.3% | 16 |
| 26 Jul 2026 | 98.6% | 16 |
| 25 Jul 2026 | 100.2% | 16 |
| 24 Jul 2026 | 97.9% | 16 |
| 23 Jul 2026 | 97.0% | 16 |
| 22 Jul 2026 | 96.4% | 15 |
| 21 Jul 2026 | 94.7% | 15 |
| 20 Jul 2026 | 94.5% | 15 |
| 19 Jul 2026 | 95.1% | 15 |
| 18 Jul 2026 | 95.7% | 15 |
| 17 Jul 2026 | 96.2% | 15 |
Frequently asked questions
What is the current water level of Lake Margaret?
As of July 28, 2026, Lake Margaret is at 96.8% of its capacity, holding approximately 16 hm³ of water, according to BOM data.
Is Lake Margaret reservoir full?
Lake Margaret is essentially full, sitting at 96.8% of capacity as of July 28, 2026.
Is the water level at Lake Margaret rising or falling?
The level at Lake Margaret has been broadly stable over the latest week on record (-0.5 points).
How much water can Lake Margaret hold?
Lake Margaret has a total capacity of 16 hm³, of which about 15 hm³ is usable storage.
Where is Lake Margaret reservoir located?
Lake Margaret is located in Tasmania, Australia (coordinates 41.991°S, 145.589°E).
When was Lake Margaret dam built?
The dam at Lake Margaret was completed in 1918.
What is Lake Margaret used for?
Lake Margaret is used primarily for water supply, and is managed by BOM.