Reservoir · Tasmania · Australia · BOM Water Data Online
Lake Rowallan
53.9% full
Capacity
130.5 hm³
Volume stored
70 hm³
River
Mersey Forth
Year completed
1967
Coordinates
41.775°S, 146.211°E
Last updated
2026-07-28
Current fill
53.9%vs 7 days ago
+1.7%gaining
vs 1 year ago
+27.7%year-over-year
7-day trend
↑rising
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. -41.775, 146.211 · Open in Google Maps
About Lake Rowallan
As of July 28, 2026, Lake Rowallan is filled to 53.9% of its total capacity, holding roughly 70 hm³ of water out of a maximum 131 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 1.7 percentage points, and it is 27.7 points above its level on the same date a year earlier.
Across the readings we hold for Lake Rowallan — 1095 data points between July 30, 2023 and July 28, 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 June.
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
- 53.9%
- Water stored
- 70 hm³
- Total capacity
- 131 hm³
- 7-day change
- ▲ 1.7 pts
- Year-on-year
- ▲ 27.7 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
- July 28, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 28 Jul 2026 | 53.9% | 70 |
| 27 Jul 2026 | 52.2% | 68 |
| 26 Jul 2026 | 50.1% | 65 |
| 25 Jul 2026 | 46.6% | 61 |
| 24 Jul 2026 | 44.2% | 58 |
| 23 Jul 2026 | 43.4% | 57 |
| 22 Jul 2026 | 42.5% | 55 |
| 21 Jul 2026 | 42.7% | 56 |
| 20 Jul 2026 | 43.3% | 57 |
| 19 Jul 2026 | 43.8% | 57 |
| 18 Jul 2026 | 44.0% | 57 |
| 17 Jul 2026 | 43.9% | 57 |
Frequently asked questions
What is the current water level of Lake Rowallan?
As of July 28, 2026, Lake Rowallan is at 53.9% of its capacity, holding approximately 70 hm³ of water, according to BOM data.
Is Lake Rowallan reservoir full?
No. As of July 28, 2026, Lake Rowallan is within its normal operating range at 53.9% of its capacity, so it is not full.
Is the water level at Lake Rowallan rising or falling?
The level at Lake Rowallan is rising — it gained 1.7 percentage points over the latest week on record.
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.