Reservoir · Western Australia · Australia · BOM Water Data Online
Mundaring
42.4% full
Capacity
63.6 hm³
Volume stored
27 hm³
River
Helena River
Year completed
1902
Coordinates
31.987°S, 116.214°E
Last updated
2026-10-24
Current fill
42.4%vs 7 days ago
-0.3 pplosing
vs 1 year ago
-14.2 ppyear-over-year
7-day trend
→stable
Drought context
Storage vs October average
83%of normal
42.4% full on 2026-10-24, against an average of 50.9% for October across 4 years of readings (-8.5 points).
Rain over the last three months · 11 October 2026
Severely dry
In the three months to 11 October 2026 the area around Mundaring had far less rain than normal, a shortfall seen about one year in fifteen. Rainfall compared with the long-run record for the same season at this point (Copernicus Global Drought Observatory, SPI-3 index −1.59). Rain, not storage. Australia drought figures →
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: 2026-10-24.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 31.987°S, 116.214°E · Open in Google Maps
About Mundaring
As of October 24, 2026, Mundaring is filled to 42.4% of its total capacity, holding 26.94 hm³ of water out of a maximum 63.6 hm³. At this level the reservoir is within its normal operating range. Of that total, 57.4 hm³ is usable (live) storage.
Over the most recent week on record the fill level has held broadly steady (-0.3 pp), and it is 14.2 points below its level on the same date a year earlier.
Across the readings we hold for Mundaring — 1057 data points between October 28, 2023 and October 24, 2026 — the level has ranged from a low of 33.2% (May 22, 2025) to a high of 63.0% (October 28, 2023). On average the reservoir is fullest around November and at its lowest around May.
The dam at Mundaring was completed in 1902. It is operated by BOM primarily for water supply. It lies within the Helena River Basin basin at 31.987°S, 116.214°E.
Key facts
- Current fill level
- 42.4% of total capacity
- Water stored
- 26.94 hm³
- Total capacity
- 63.6 hm³
- Usable capacity
- 57.4 hm³
- 7-day change
- ▼ 0.3 pp
- Year-on-year
- ▼ 14.2 pp
- Primary use
- Water supply
- River
- Helena River
- River basin
- Helena River Basin
- Year completed
- 1902
- Operator
- BOM
- Coordinates
- 31.987°S, 116.214°E
- Last updated
- October 24, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 24 Oct 2026 | 42.4% | 26.94 |
| 23 Oct 2026 | 42.4% | 26.97 |
| 22 Oct 2026 | 42.5% | 27.01 |
| 21 Oct 2026 | 42.5% | 27.02 |
| 20 Oct 2026 | 42.5% | 27.06 |
| 19 Oct 2026 | 42.6% | 27.11 |
| 18 Oct 2026 | 42.7% | 27.14 |
| 17 Oct 2026 | 42.7% | 27.16 |
| 16 Oct 2026 | 42.8% | 27.2 |
| 15 Oct 2026 | 42.8% | 27.25 |
| 14 Oct 2026 | 42.8% | 27.25 |
| 13 Oct 2026 | 42.8% | 27.25 |