Reservoir · Tasmania · Australia · BOM Water Data Online
Wayatinah Lagoon
64.6% full
Capacity
8.9 hm³
Volume stored
6 hm³
River
Derwent River
Year completed
1957
Coordinates
42.395°S, 146.512°E
Last updated
2026-07-28
Current fill
64.6%vs 7 days ago
-2.8%losing
vs 1 year ago
+15.5%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: 2026-07-28.
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 July 28, 2026, Wayatinah Lagoon is filled to 64.6% of its total capacity, holding roughly 6 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 2.8 percentage points, and it is 15.5 points above its level on the same date a year earlier.
Across the readings we hold for Wayatinah Lagoon — 1095 data points between July 30, 2023 and July 28, 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
- 64.6%
- Water stored
- 6 hm³
- Total capacity
- 9 hm³
- 7-day change
- ▼ 2.8 pts
- Year-on-year
- ▲ 15.5 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
- July 28, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 28 Jul 2026 | 64.6% | 6 |
| 27 Jul 2026 | 67.4% | 6 |
| 26 Jul 2026 | 67.1% | 6 |
| 25 Jul 2026 | 42.9% | 4 |
| 24 Jul 2026 | 30.6% | 3 |
| 23 Jul 2026 | 38.0% | 3 |
| 22 Jul 2026 | 44.0% | 4 |
| 21 Jul 2026 | 54.4% | 5 |
| 20 Jul 2026 | 57.6% | 5 |
| 19 Jul 2026 | 58.6% | 5 |
| 18 Jul 2026 | 56.1% | 5 |
| 17 Jul 2026 | 57.5% | 5 |
Frequently asked questions
What is the current water level of Wayatinah Lagoon?
As of July 28, 2026, Wayatinah Lagoon is at 64.6% of its capacity, holding approximately 6 hm³ of water, according to BOM data.
Is Wayatinah Lagoon reservoir full?
No. As of July 28, 2026, Wayatinah Lagoon is within its normal operating range at 64.6% of its capacity, so it is not full.
Is the water level at Wayatinah Lagoon rising or falling?
The level at Wayatinah Lagoon is falling — it dropped 2.8 percentage points over the latest week on record.
How much water can Wayatinah Lagoon hold?
Wayatinah Lagoon has a total capacity of 9 hm³.
Where is Wayatinah Lagoon reservoir located?
Wayatinah Lagoon is located in Tasmania, Australia, within the Derwent River Basin basin (coordinates 42.395°S, 146.512°E).
When was Wayatinah Lagoon dam built?
The dam at Wayatinah Lagoon was completed in 1957.
What is Wayatinah Lagoon used for?
Wayatinah Lagoon is used primarily for water supply, and is managed by BOM.