Reservoir · Queensland · Australia · BOM Water Data Online
Marian Weir
101.4% full
Capacity
4 hm³
Volume stored
4 hm³
Year completed
1952
Coordinates
21.138°S, 148.910°E
Last updated
2026-07-28
Current fill
101.4%vs 7 days ago
0.0%stable
vs 1 year ago
-0.6%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: 2026-07-28.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. -21.138, 148.910 · Open in Google Maps
About Marian Weir
As of July 28, 2026, Marian Weir is filled to 101.4% of its total capacity, holding roughly 4 hm³ of water out of a maximum 4 hm³. At this level the reservoir is effectively full.
Over the most recent week on record the fill level has held broadly steady (+0.0 pts), and it sits close to where it was a year earlier.
Across the readings we hold for Marian Weir — 1090 data points between July 30, 2023 and July 28, 2026 — the level has ranged from a low of 100.1% (October 4, 2025) to a high of 148.4% (February 7, 2025). On average the reservoir is fullest around February and at its lowest around October.
The dam at Marian Weir was completed in 1952. It is operated by BOM primarily for water supply.
Key facts
- Current fill level
- 101.4%
- Water stored
- 4 hm³
- Total capacity
- 4 hm³
- 7-day change
- No change
- Year-on-year
- ▼ 0.6 pts
- Primary use
- Water supply
- Year completed
- 1952
- Operator
- BOM
- Coordinates
- 21.138°S, 148.910°E
- Last updated
- July 28, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 28 Jul 2026 | 101.4% | 4 |
| 27 Jul 2026 | 101.4% | 4 |
| 26 Jul 2026 | 101.8% | 4 |
| 25 Jul 2026 | 101.9% | 4 |
| 24 Jul 2026 | 101.3% | 4 |
| 23 Jul 2026 | 101.3% | 4 |
| 22 Jul 2026 | 101.6% | 4 |
| 21 Jul 2026 | 101.3% | 4 |
| 20 Jul 2026 | 101.3% | 4 |
| 19 Jul 2026 | 101.3% | 4 |
| 18 Jul 2026 | 101.4% | 4 |
| 17 Jul 2026 | 101.4% | 4 |
Frequently asked questions
What is the current water level of Marian Weir?
As of July 28, 2026, Marian Weir is at 101.4% of its capacity, holding approximately 4 hm³ of water, according to BOM data.
Is Marian Weir reservoir full?
Marian Weir is essentially full, sitting at 101.4% of capacity as of July 28, 2026.
Is the water level at Marian Weir rising or falling?
The level at Marian Weir has been broadly stable over the latest week on record (0.0 points).
How much water can Marian Weir hold?
Marian Weir has a total capacity of 4 hm³.
Where is Marian Weir reservoir located?
Marian Weir is located in Queensland, Australia (coordinates 21.138°S, 148.910°E).
When was Marian Weir dam built?
The dam at Marian Weir was completed in 1952.
What is Marian Weir used for?
Marian Weir is used primarily for water supply, and is managed by BOM.