Reservoir · Western Australia · Australia · BOM Water Data Online
South Dandalup
17.8% full
Capacity
138 hm³
Volume stored
25 hm³
River
South Dandalup River
Year completed
1974
Coordinates
32.666°S, 116.086°E
Last updated
2026-10-24
Current fill
17.8%vs 7 days ago
-0.1 pplosing
vs 1 year ago
-1.0 ppyear-over-year
7-day trend
→stable
Drought context
Storage vs October average
88%of normal
17.8% full on 2026-10-24, against an average of 20.3% for October across 4 years of readings (-2.5 points).
Rain over the last three months · 11 October 2026
Moderately dry
In the three months to 11 October 2026 the area around South Dandalup had well below normal rain, a shortfall seen about one year in six. Rainfall compared with the long-run record for the same season at this point (Copernicus Global Drought Observatory, SPI-3 index −1.16). 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. 32.666°S, 116.086°E · Open in Google Maps
About South Dandalup
As of October 24, 2026, South Dandalup is filled to 17.8% of its total capacity, holding 24.61 hm³ of water out of a maximum 138 hm³. At this level the reservoir is critically low. Of that total, 125.1 hm³ is usable (live) storage.
Over the most recent week on record the fill level has held broadly steady (-0.1 pp), and it is 1.0 points below its level on the same date a year earlier.
Across the readings we hold for South Dandalup — 1043 data points between October 28, 2023 and October 24, 2026 — the level has ranged from a low of 13.9% (April 26, 2025) to a high of 26.8% (October 28, 2023). On average the reservoir is fullest around November and at its lowest around May.
The dam at South Dandalup was completed in 1974. It is operated by BOM primarily for water supply. It lies within the South Dandalup River Basin basin at 32.666°S, 116.086°E.
Key facts
- Current fill level
- 17.8% of total capacity
- Water stored
- 24.61 hm³
- Total capacity
- 138 hm³
- Usable capacity
- 125.1 hm³
- 7-day change
- ▼ 0.1 pp
- Year-on-year
- ▼ 1.0 pp
- Primary use
- Water supply
- River
- South Dandalup River
- River basin
- South Dandalup River Basin
- Year completed
- 1974
- Operator
- BOM
- Coordinates
- 32.666°S, 116.086°E
- Last updated
- October 24, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 24 Oct 2026 | 17.8% | 24.61 |
| 23 Oct 2026 | 17.8% | 24.59 |
| 22 Oct 2026 | 17.8% | 24.63 |
| 21 Oct 2026 | 17.9% | 24.68 |
| 20 Oct 2026 | 17.9% | 24.7 |
| 19 Oct 2026 | 17.9% | 24.7 |
| 18 Oct 2026 | 17.9% | 24.72 |
| 17 Oct 2026 | 17.9% | 24.74 |
| 16 Oct 2026 | 17.9% | 24.74 |
| 15 Oct 2026 | 17.9% | 24.74 |
| 14 Oct 2026 | 17.9% | 24.76 |
| 13 Oct 2026 | 18.0% | 24.79 |