Reservoir · Tasmania · Australia · BOM Water Data Online
Shannon Lagoon
58.0% full
Capacity
1.7 hm³
Volume stored
1 hm³
Coordinates
41.993°S, 146.739°E
Last updated
2026-09-07
Current fill
58.0%vs 7 days ago
-2.2%losing
vs 1 year ago
-20.1%year-over-year
7-day trend
↓falling
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: 2026-09-07.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. -41.993, 146.739 · Open in Google Maps
About Shannon Lagoon
As of September 7, 2026, Shannon Lagoon is filled to 58.0% of its total capacity, holding roughly 1 hm³ of water out of a maximum 2 hm³. At this level the reservoir is within its normal operating range.
Over the most recent week on record the fill level has fallen by 2.2 percentage points, and it is 20.1 points below its level on the same date a year earlier.
Across the readings we hold for Shannon Lagoon — 1093 data points between September 11, 2023 and September 7, 2026 — the level has ranged from a low of 23.1% (June 13, 2025) to a high of 103.2% (September 2, 2024). On average the reservoir is fullest around September and at its lowest around June.
It is operated by BOM primarily for water supply.
Key facts
- Current fill level
- 58.0%
- Water stored
- 1 hm³
- Total capacity
- 2 hm³
- 7-day change
- ▼ 2.2 pts
- Year-on-year
- ▼ 20.1 pts
- Primary use
- Water supply
- Operator
- BOM
- Coordinates
- 41.993°S, 146.739°E
- Last updated
- September 7, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 7 Sep 2026 | 58.0% | 1 |
| 6 Sep 2026 | 59.6% | 1 |
| 5 Sep 2026 | 61.1% | 1 |
| 4 Sep 2026 | 60.9% | 1 |
| 3 Sep 2026 | 58.9% | 1 |
| 2 Sep 2026 | 59.7% | 1 |
| 1 Sep 2026 | 64.5% | 1 |
| 31 Aug 2026 | 60.2% | 1 |
| 30 Aug 2026 | 60.9% | 1 |
| 29 Aug 2026 | 61.2% | 1 |
| 28 Aug 2026 | 64.9% | 1 |
| 27 Aug 2026 | 66.8% | 1 |