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
2026-07-26
Current fill
33.2%vs 7 days ago
0.0%stable
vs 1 year ago
+1.8%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: 2026-07-26.
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 July 26, 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 (+0.0 pts), and it is 1.8 points above its level on the same date a year earlier.
Across the readings we hold for Serpentine — 1070 data points between July 30, 2023 and July 26, 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
- No change
- Year-on-year
- ▲ 1.8 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
- July 26, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 26 Jul 2026 | 33.2% | 46 |
| 25 Jul 2026 | 33.2% | 46 |
| 24 Jul 2026 | 33.1% | 46 |
| 23 Jul 2026 | 33.1% | 46 |
| 22 Jul 2026 | 33.2% | 46 |
| 21 Jul 2026 | 33.1% | 46 |
| 20 Jul 2026 | 33.1% | 46 |
| 19 Jul 2026 | 33.1% | 46 |
| 18 Jul 2026 | 32.9% | 45 |
| 17 Jul 2026 | 32.8% | 45 |
| 16 Jul 2026 | 32.9% | 45 |
| 15 Jul 2026 | 32.9% | 45 |
Frequently asked questions
What is the current water level of Serpentine?
As of July 26, 2026, Serpentine is at 33.2% of its capacity, holding approximately 46 hm³ of water, according to BOM data.
Is Serpentine reservoir full?
No. As of July 26, 2026, Serpentine is low at 33.2% of its capacity, so it is not full.
Is the water level at Serpentine rising or falling?
The level at Serpentine has been broadly stable over the latest week on record (0.0 points).
How much water can Serpentine hold?
Serpentine has a total capacity of 138 hm³, of which about 137 hm³ is usable storage.
Where is Serpentine reservoir located?
Serpentine is located in Western Australia, Australia, within the Serpentine River Basin basin (coordinates 32.459°S, 116.152°E).
When was Serpentine dam built?
The dam at Serpentine was completed in 1961.
What is Serpentine used for?
Serpentine is used primarily for water supply, and is managed by BOM.