Reservoir · Western Australia · Australia · BOM Water Data Online
Serpentine
32.6% full
Capacity
137.7 hm³
Volume stored
45 hm³
River
Serpentine River
Year completed
1961
Coordinates
32.459°S, 116.152°E
Last updated
2026-10-24
Current fill
32.6%vs 7 days ago
-0.4 pplosing
vs 1 year ago
-2.1 ppyear-over-year
7-day trend
→stable
Drought context
Storage vs October average
87%of normal
32.6% full on 2026-10-24, against an average of 37.5% for October across 4 years of readings (-4.9 points).
Rain over the last three months · 11 October 2026
Moderately dry
In the three months to 11 October 2026 the area around Serpentine 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 −1.33). 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. 32.459°S, 116.152°E · Open in Google Maps
About Serpentine
As of October 24, 2026, Serpentine is filled to 32.6% of its total capacity, holding 44.87 hm³ of water out of a maximum 137.7 hm³. At this level the reservoir is low. Of that total, 136.7 hm³ is usable (live) storage.
Over the most recent week on record the fill level has held broadly steady (-0.4 pp), and it is 2.1 points below its level on the same date a year earlier.
Across the readings we hold for Serpentine — 1066 data points between October 28, 2023 and October 24, 2026 — the level has ranged from a low of 28.1% (July 19, 2025) to a high of 52.3% (October 28, 2023). On average the reservoir is fullest around November and at its lowest around May.
The dam at Serpentine was completed in 1961. It is operated by BOM primarily for water supply. It lies within the Serpentine River Basin basin at 32.459°S, 116.152°E.
Key facts
- Current fill level
- 32.6% of total capacity
- Water stored
- 44.87 hm³
- Total capacity
- 137.7 hm³
- Usable capacity
- 136.7 hm³
- 7-day change
- ▼ 0.4 pp
- Year-on-year
- ▼ 2.1 pp
- Primary use
- Water supply
- River
- Serpentine River
- River basin
- Serpentine River Basin
- Year completed
- 1961
- Operator
- BOM
- Coordinates
- 32.459°S, 116.152°E
- Last updated
- October 24, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 24 Oct 2026 | 32.6% | 44.87 |
| 23 Oct 2026 | 32.6% | 44.91 |
| 22 Oct 2026 | 32.7% | 45 |
| 21 Oct 2026 | 32.8% | 45.09 |
| 20 Oct 2026 | 32.8% | 45.18 |
| 19 Oct 2026 | 32.9% | 45.27 |
| 18 Oct 2026 | 32.9% | 45.34 |
| 17 Oct 2026 | 33.0% | 45.41 |
| 16 Oct 2026 | 33.1% | 45.5 |
| 15 Oct 2026 | 33.1% | 45.55 |
| 14 Oct 2026 | 33.1% | 45.55 |
| 13 Oct 2026 | 33.1% | 45.55 |