Reservoir · Tasmania · Australia · BOM Water Data Online
Lake King William
89.9% full
Capacity
539.3 hm³
Volume stored
485 hm³
River
Off-stream
Coordinates
42.230°S, 146.231°E
Last updated
2026-09-07
Current fill
89.9%vs 7 days ago
+1.8%gaining
vs 1 year ago
+39.7%year-over-year
7-day trend
↑rising
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. -42.230, 146.231 · Open in Google Maps
About Lake King William
As of September 7, 2026, Lake King William is filled to 89.9% of its total capacity, holding roughly 485 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 risen by 1.8 percentage points, and it is 39.7 points above its level on the same date a year earlier.
Across the readings we hold for Lake King William — 1093 data points between September 11, 2023 and September 7, 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
- 89.9%
- Water stored
- 485 hm³
- Total capacity
- 539 hm³
- 7-day change
- ▲ 1.8 pts
- Year-on-year
- ▲ 39.7 pts
- Primary use
- Water supply
- River
- Off-stream
- River basin
- Off-stream Basin
- Operator
- BOM
- Coordinates
- 42.230°S, 146.231°E
- Last updated
- September 7, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 7 Sep 2026 | 89.9% | 485 |
| 6 Sep 2026 | 89.7% | 484 |
| 5 Sep 2026 | 89.4% | 482 |
| 4 Sep 2026 | 88.9% | 479 |
| 3 Sep 2026 | 88.3% | 476 |
| 2 Sep 2026 | 87.9% | 474 |
| 1 Sep 2026 | 87.9% | 474 |
| 31 Aug 2026 | 88.1% | 475 |
| 30 Aug 2026 | 88.1% | 475 |
| 29 Aug 2026 | 88.2% | 476 |
| 28 Aug 2026 | 88.2% | 476 |
| 27 Aug 2026 | 88.2% | 476 |