Reservoir · Western Australia · Australia · BOM Water Data Online
Serpentine
33.2% full
Capacity
137.7 hm³
Volume stored
46 hm³
River
Serpentine River
Year completed
1961
Coordinates
32.459°S, 116.152°E
Last updated
2026-09-07
Current fill
33.2%vs 7 days ago
+0.1%gaining
vs 1 year ago
+1.2%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: 2026-09-07.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. -32.459, 116.152 · Open in Google Maps
About Serpentine
As of September 7, 2026, Serpentine is filled to 33.2% of its total capacity, holding roughly 46 hm³ of water out of a maximum 138 hm³. At this level the reservoir is low. Of that total, about 137 hm³ is usable (live) storage.
Over the most recent week on record the fill level has held broadly steady (+0.1 pts), and it is 1.2 points above its level on the same date a year earlier.
Across the readings we hold for Serpentine — 1067 data points between September 11, 2023 and September 7, 2026 — the level has ranged from a low of 28.1% (July 19, 2025) to a high of 53.5% (September 20, 2023). On average the reservoir is fullest around October 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
- 33.2%
- Water stored
- 46 hm³
- Total capacity
- 138 hm³
- Usable capacity
- 137 hm³
- 7-day change
- ▲ 0.1 pts
- Year-on-year
- ▲ 1.2 pts
- 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
- September 7, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 7 Sep 2026 | 33.2% | 46 |
| 6 Sep 2026 | 33.2% | 46 |
| 5 Sep 2026 | 33.2% | 46 |
| 4 Sep 2026 | 33.1% | 46 |
| 3 Sep 2026 | 33.1% | 46 |
| 2 Sep 2026 | 33.1% | 46 |
| 1 Sep 2026 | 33.1% | 46 |
| 31 Aug 2026 | 33.1% | 46 |
| 30 Aug 2026 | 33.1% | 46 |
| 29 Aug 2026 | 33.2% | 46 |
| 28 Aug 2026 | 33.2% | 46 |
| 27 Aug 2026 | 33.2% | 46 |