Reservoir · New South Wales · Australia · BOM Water Data Online
Hay Weir
84.7% full
Capacity
13.3 hm³
Volume stored
11 hm³
Coordinates
34.522°S, 144.713°E
Last updated
2026-09-09
Current fill
84.7%vs 7 days ago
-1.4%losing
vs 1 year ago
+31.5%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: 2026-09-09.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. -34.522, 144.713 · Open in Google Maps
About Hay Weir
As of September 9, 2026, Hay Weir is filled to 84.7% of its total capacity, holding roughly 11 hm³ of water out of a maximum 13 hm³. At this level the reservoir is high. Of that total, about 12 hm³ is usable (live) storage.
Over the most recent week on record the fill level has held broadly steady (-1.4 pts), and it is 31.5 points above its level on the same date a year earlier.
Across the readings we hold for Hay Weir — 1095 data points between September 11, 2023 and September 9, 2026 — the level has ranged from a low of 30.6% (July 22, 2026) to a high of 86.8% (October 1, 2024). On average the reservoir is fullest around November and at its lowest around February.
It is operated by BOM primarily for water supply.
Key facts
- Current fill level
- 84.7%
- Water stored
- 11 hm³
- Total capacity
- 13 hm³
- Usable capacity
- 12 hm³
- 7-day change
- ▼ 1.4 pts
- Year-on-year
- ▲ 31.5 pts
- Primary use
- Water supply
- Operator
- BOM
- Coordinates
- 34.522°S, 144.713°E
- Last updated
- September 9, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 9 Sep 2026 | 84.7% | 11 |
| 8 Sep 2026 | 86.0% | 11 |
| 7 Sep 2026 | 80.8% | 11 |
| 6 Sep 2026 | 85.9% | 11 |
| 5 Sep 2026 | 86.1% | 11 |
| 4 Sep 2026 | 86.1% | 11 |
| 3 Sep 2026 | 86.1% | 11 |
| 2 Sep 2026 | 86.1% | 11 |
| 1 Sep 2026 | 86.0% | 11 |
| 31 Aug 2026 | 85.6% | 11 |
| 30 Aug 2026 | 85.7% | 11 |
| 29 Aug 2026 | 86.1% | 11 |