Reservoir · Tasmania · Australia · BOM Water Data Online
Wayatinah Lagoon
56.2% full
Capacity
8.9 hm³
Volume stored
5 hm³
River
Derwent River
Year completed
1957
Coordinates
42.395°S, 146.512°E
Last updated
2026-09-07
Current fill
56.2%vs 7 days ago
-3.2%losing
vs 1 year ago
+1.1%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. -42.395, 146.512 · Open in Google Maps
About Wayatinah Lagoon
As of September 7, 2026, Wayatinah Lagoon is filled to 56.2% of its total capacity, holding roughly 5 hm³ of water out of a maximum 9 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 3.2 percentage points, and it is 1.1 points above its level on the same date a year earlier.
Across the readings we hold for Wayatinah Lagoon — 1094 data points between September 10, 2023 and September 7, 2026 — the level has ranged from a low of 8.1% (December 3, 2024) to a high of 121.7% (September 2, 2024). On average the reservoir is fullest around September and at its lowest around May.
The dam at Wayatinah Lagoon was completed in 1957. It is operated by BOM primarily for water supply. It lies within the Derwent River Basin basin at 42.395°S, 146.512°E.
Key facts
- Current fill level
- 56.2%
- Water stored
- 5 hm³
- Total capacity
- 9 hm³
- 7-day change
- ▼ 3.2 pts
- Year-on-year
- ▲ 1.1 pts
- Primary use
- Water supply
- River
- Derwent River
- River basin
- Derwent River Basin
- Year completed
- 1957
- Operator
- BOM
- Coordinates
- 42.395°S, 146.512°E
- Last updated
- September 7, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 7 Sep 2026 | 56.2% | 5 |
| 6 Sep 2026 | 54.0% | 5 |
| 5 Sep 2026 | 50.2% | 4 |
| 4 Sep 2026 | 43.2% | 4 |
| 3 Sep 2026 | 28.9% | 3 |
| 2 Sep 2026 | 28.1% | 2 |
| 1 Sep 2026 | 46.0% | 4 |
| 31 Aug 2026 | 59.4% | 5 |
| 30 Aug 2026 | 59.0% | 5 |
| 29 Aug 2026 | 60.3% | 5 |
| 28 Aug 2026 | 59.5% | 5 |
| 27 Aug 2026 | 60.6% | 5 |