Reservoir · Tasmania · Australia · BOM Water Data Online
Lake Rowallan
24.9% full
Capacity
130.5 hm³
Volume stored
32 hm³
River
Mersey Forth
Year completed
1967
Coordinates
41.775°S, 146.211°E
Last updated
2026-06-09
Current fill
24.9%vs 7 days ago
-0.5%losing
vs 1 year ago
-26.3%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: 2026-06-09.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. -41.775, 146.211 · Open in Google Maps
About Lake Rowallan
As of June 9, 2026, Lake Rowallan is filled to 24.9% of its total capacity, holding roughly 32 hm³ of water out of a maximum 131 hm³. At this level the reservoir is low.
Over the most recent week on record the fill level has held broadly steady (-0.5 pts), and it is 26.3 points below its level on the same date a year earlier.
Across the readings we hold for Lake Rowallan — 1094 data points between June 12, 2023 and June 9, 2026 — the level has ranged from a low of 20.9% (June 14, 2025) to a high of 101.6% (September 2, 2024). On average the reservoir is fullest around December and at its lowest around May.
The dam at Lake Rowallan was completed in 1967. It is operated by BOM primarily for water supply. It lies within the Mersey Forth Basin basin at 41.775°S, 146.211°E.
Key facts
- Current fill level
- 24.9%
- Water stored
- 32 hm³
- Total capacity
- 131 hm³
- 7-day change
- ▼ 0.5 pts
- Year-on-year
- ▼ 26.3 pts
- Primary use
- Water supply
- River
- Mersey Forth
- River basin
- Mersey Forth Basin
- Year completed
- 1967
- Operator
- BOM
- Coordinates
- 41.775°S, 146.211°E
- Last updated
- June 9, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 9 Jun 2026 | 24.9% | 32 |
| 8 Jun 2026 | 25.4% | 33 |
| 7 Jun 2026 | 26.2% | 34 |
| 6 Jun 2026 | 26.8% | 35 |
| 5 Jun 2026 | 27.4% | 36 |
| 4 Jun 2026 | 27.9% | 36 |
| 3 Jun 2026 | 28.1% | 37 |
| 2 Jun 2026 | 28.1% | 37 |
| 1 Jun 2026 | 28.4% | 37 |
| 31 May 2026 | 28.7% | 37 |
| 30 May 2026 | 29.7% | 39 |
| 29 May 2026 | 30.8% | 40 |
Frequently asked questions
What is the current water level of Lake Rowallan?
As of June 9, 2026, Lake Rowallan is at 24.9% of its capacity, holding approximately 32 hm³ of water, according to BOM data.
Is Lake Rowallan reservoir full?
No. As of June 9, 2026, Lake Rowallan is low at 24.9% of its capacity, so it is not full.
Is the water level at Lake Rowallan rising or falling?
The level at Lake Rowallan has been broadly stable over the latest week on record (-0.5 points).
How much water can Lake Rowallan hold?
Lake Rowallan has a total capacity of 131 hm³.
Where is Lake Rowallan reservoir located?
Lake Rowallan is located in Tasmania, Australia, within the Mersey Forth Basin basin (coordinates 41.775°S, 146.211°E).
When was Lake Rowallan dam built?
The dam at Lake Rowallan was completed in 1967.
What is Lake Rowallan used for?
Lake Rowallan is used primarily for water supply, and is managed by BOM.