Reservoir · Tasmania · Australia · BOM Water Data Online
Lake King William
89.8% full
Capacity
539.3 hm³
Volume stored
484 hm³
River
Off-stream
Coordinates
42.230°S, 146.231°E
Last updated
2026-10-11
Current fill
89.8%vs 7 days ago
-0.6%losing
vs 1 year ago
-6.1%year-over-year
7-day trend
→stable
Drought context
Storage vs October average
95%of normal
89.8% full on 2026-10-11, against an average of 94.3% for October across 4 years of readings (-4.5 points).
Rain over the last three months · 21 September 2026
Near normal
In the three months to 21 September 2026 the area around Lake King William had rain close to normal for the season. Rainfall compared with the long-run record for the same season at this point (Copernicus Global Drought Observatory, SPI-3 index −0.91). 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: 2026-10-11.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. -42.230, 146.231 · Open in Google Maps
About Lake King William
As of October 11, 2026, Lake King William is filled to 89.8% of its total capacity, holding roughly 484 hm³ of water out of a maximum 539 hm³. At this level the reservoir is high.
Over the most recent week on record the fill level has held broadly steady (-0.6 pts), and it is 6.1 points below its level on the same date a year earlier.
Across the readings we hold for Lake King William — 1095 data points between October 13, 2023 and October 11, 2026 — the level has ranged from a low of 23.7% (June 26, 2024) to a high of 98.7% (November 14, 2025). On average the reservoir is fullest around October and at its lowest around June.
It is operated by BOM primarily for water supply. It lies within the Off-stream Basin basin at 42.230°S, 146.231°E.
Key facts
- Current fill level
- 89.8%
- Water stored
- 484 hm³
- Total capacity
- 539 hm³
- 7-day change
- ▼ 0.6 pts
- Year-on-year
- ▼ 6.1 pts
- Primary use
- Water supply
- River
- Off-stream
- River basin
- Off-stream Basin
- Operator
- BOM
- Coordinates
- 42.230°S, 146.231°E
- Last updated
- October 11, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 11 Oct 2026 | 89.8% | 484 |
| 10 Oct 2026 | 89.9% | 485 |
| 9 Oct 2026 | 90.1% | 486 |
| 8 Oct 2026 | 90.2% | 487 |
| 7 Oct 2026 | 90.3% | 487 |
| 6 Oct 2026 | 90.3% | 487 |
| 5 Oct 2026 | 90.3% | 487 |
| 4 Oct 2026 | 90.4% | 488 |
| 3 Oct 2026 | 90.5% | 488 |
| 2 Oct 2026 | 90.6% | 488 |
| 1 Oct 2026 | 90.5% | 488 |
| 30 Sep 2026 | 90.5% | 488 |