Reservoir · Tasmania · Australia · BOM Water Data Online
Shannon Lagoon
66.9% full
Capacity
1.7 hm³
Volume stored
1 hm³
Coordinates
41.993°S, 146.739°E
Last updated
2026-10-10
Current fill
66.9%vs 7 days ago
+4.6%gaining
vs 1 year ago
+0.2%year-over-year
7-day trend
↑rising
Drought context
Storage vs October average
105%of normal
66.9% full on 2026-10-10, against an average of 63.9% for October across 4 years of readings (+3.0 points).
Rain over the last three months · 21 September 2026
Severely dry
In the three months to 21 September 2026 the area around Shannon Lagoon had far less rain than normal, a shortfall seen about one year in fifteen. Rainfall compared with the long-run record for the same season at this point (Copernicus Global Drought Observatory, SPI-3 index −1.51). 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: 2026-10-10.
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 October 10, 2026, Shannon Lagoon is filled to 66.9% 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 risen by 4.6 percentage points, and it sits close to where it was a year earlier.
Across the readings we hold for Shannon Lagoon — 1094 data points between October 13, 2023 and October 10, 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
- 66.9%
- Water stored
- 1 hm³
- Total capacity
- 2 hm³
- 7-day change
- ▲ 4.6 pts
- Year-on-year
- ▲ 0.2 pts
- Primary use
- Water supply
- Operator
- BOM
- Coordinates
- 41.993°S, 146.739°E
- Last updated
- October 10, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 10 Oct 2026 | 66.9% | 1 |
| 9 Oct 2026 | 68.6% | 1 |
| 8 Oct 2026 | 66.6% | 1 |
| 7 Oct 2026 | 63.7% | 1 |
| 6 Oct 2026 | 63.2% | 1 |
| 5 Oct 2026 | 63.9% | 1 |
| 4 Oct 2026 | 62.3% | 1 |
| 3 Oct 2026 | 62.3% | 1 |
| 2 Oct 2026 | 63.0% | 1 |
| 1 Oct 2026 | 64.6% | 1 |
| 30 Sep 2026 | 67.2% | 1 |
| 29 Sep 2026 | 66.0% | 1 |