Reservoir · Tasmania · Australia · BOM Water Data Online
Lake St Clair
0.7% full
Capacity
2,000 hm³
Volume stored
14 hm³
River
Derwent River
Year completed
1968
Coordinates
42.068°S, 146.168°E
Last updated
2026-10-26
Current fill
0.7%vs 7 days ago
-0.1 pplosing
vs 1 year ago
-0.4 ppyear-over-year
7-day trend
→stable
Drought context
Storage vs October average
70%of normal
0.7% full on 2026-10-26, against an average of 1.0% for October across 4 years of readings (-0.3 points).
Rain over the last three months · 11 October 2026
Moderately dry
In the three months to 11 October 2026 the area around Lake St Clair 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 −1.37). 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: 2026-10-26.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 42.068°S, 146.168°E · Open in Google Maps
About Lake St Clair
As of October 26, 2026, Lake St Clair is filled to 0.7% of its total capacity, holding 13.54 hm³ of water out of a maximum 2,000 hm³. At this level the reservoir is critically low. Of that total, 205.9 hm³ is usable (live) storage.
Over the most recent week on record the fill level has held broadly steady (-0.1 pp), and it sits close to where it was a year earlier.
Across the readings we hold for Lake St Clair — 1095 data points between October 28, 2023 and October 26, 2026 — the level has ranged from a low of 0.1% (March 1, 2025) to a high of 2.4% (September 2, 2024). On average the reservoir is fullest around September and at its lowest around March.
The dam at Lake St Clair was completed in 1968. It is operated by BOM primarily for water supply. It lies within the Derwent River Basin basin at 42.068°S, 146.168°E.
Key facts
- Current fill level
- 0.7% of total capacity
- Water stored
- 13.54 hm³
- Total capacity
- 2,000 hm³
- Usable capacity
- 205.9 hm³
- 7-day change
- ▼ 0.1 pp
- Year-on-year
- ▼ 0.4 pp
- Primary use
- Water supply
- River
- Derwent River
- River basin
- Derwent River Basin
- Year completed
- 1968
- Operator
- BOM
- Coordinates
- 42.068°S, 146.168°E
- Last updated
- October 26, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 26 Oct 2026 | 0.7% | 13.54 |
| 25 Oct 2026 | 0.7% | 13.64 |
| 24 Oct 2026 | 0.7% | 13.88 |
| 23 Oct 2026 | 0.7% | 14.45 |
| 22 Oct 2026 | 0.8% | 15.02 |
| 21 Oct 2026 | 0.8% | 15.6 |
| 20 Oct 2026 | 0.8% | 16.09 |
| 19 Oct 2026 | 0.8% | 16.7 |
| 18 Oct 2026 | 0.9% | 17.31 |
| 17 Oct 2026 | 0.9% | 17.85 |
| 16 Oct 2026 | 0.9% | 18.2 |
| 15 Oct 2026 | 0.9% | 18.27 |