Reservoir · Queensland · Australia · BOM Water Data Online
Marian Weir
100.9% full
Capacity
4 hm³
Volume stored
4 hm³
Year completed
1952
Coordinates
21.138°S, 148.910°E
Last updated
2026-09-09
Current fill
100.9%vs 7 days ago
-0.2%losing
vs 1 year ago
-0.1%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: 2026-09-09.
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 September 9, 2026, Marian Weir is filled to 100.9% 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 (-0.2 pts), and it sits close to where it was a year earlier.
Across the readings we hold for Marian Weir — 1090 data points between September 11, 2023 and September 9, 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
- 100.9%
- Water stored
- 4 hm³
- Total capacity
- 4 hm³
- 7-day change
- ▼ 0.2 pts
- Year-on-year
- ▼ 0.1 pts
- Primary use
- Water supply
- Year completed
- 1952
- Operator
- BOM
- Coordinates
- 21.138°S, 148.910°E
- Last updated
- September 9, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 9 Sep 2026 | 100.9% | 4 |
| 8 Sep 2026 | 101.1% | 4 |
| 7 Sep 2026 | 101.1% | 4 |
| 6 Sep 2026 | 101.0% | 4 |
| 5 Sep 2026 | 101.0% | 4 |
| 4 Sep 2026 | 101.0% | 4 |
| 3 Sep 2026 | 101.1% | 4 |
| 2 Sep 2026 | 101.1% | 4 |
| 1 Sep 2026 | 100.9% | 4 |
| 31 Aug 2026 | 100.8% | 4 |
| 30 Aug 2026 | 100.9% | 4 |
| 29 Aug 2026 | 100.9% | 4 |