Reservoir · New South Wales · Australia · BOM Water Data Online
Tallowa
99.4% full
Capacity
90 hm³
Volume stored
89 hm³
River
Shoalhaven River
Year completed
1976
Coordinates
34.749°S, 150.346°E
Last updated
2026-09-09
Current fill
99.4%vs 7 days ago
-0.4%losing
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: 2026-09-09.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. -34.749, 150.346 · Open in Google Maps
About Tallowa
As of September 9, 2026, Tallowa is filled to 99.4% of its total capacity, holding roughly 89 hm³ of water out of a maximum 90 hm³. At this level the reservoir is high. Of that total, about 84 hm³ is usable (live) storage.
Over the most recent week on record the fill level has held broadly steady (-0.4 pts), and it is 1.8 points below its level on the same date a year earlier.
Across the readings we hold for Tallowa — 1095 data points between September 11, 2023 and September 9, 2026 — the level has ranged from a low of 90.1% (November 24, 2023) to a high of 121.2% (June 8, 2024). On average the reservoir is fullest around May and at its lowest around November.
The dam at Tallowa was completed in 1976. It is operated by BOM primarily for water supply. It lies within the Shoalhaven River Basin basin at 34.749°S, 150.346°E.
Key facts
- Current fill level
- 99.4%
- Water stored
- 89 hm³
- Total capacity
- 90 hm³
- Usable capacity
- 84 hm³
- 7-day change
- ▼ 0.4 pts
- Year-on-year
- ▼ 1.8 pts
- Primary use
- Water supply
- River
- Shoalhaven River
- River basin
- Shoalhaven River Basin
- Year completed
- 1976
- Operator
- BOM
- Coordinates
- 34.749°S, 150.346°E
- Last updated
- September 9, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 9 Sep 2026 | 99.4% | 89 |
| 8 Sep 2026 | 99.7% | 90 |
| 7 Sep 2026 | 99.7% | 90 |
| 6 Sep 2026 | 99.7% | 90 |
| 5 Sep 2026 | 99.8% | 90 |
| 4 Sep 2026 | 99.9% | 90 |
| 3 Sep 2026 | 99.9% | 90 |
| 2 Sep 2026 | 99.8% | 90 |
| 1 Sep 2026 | 99.8% | 90 |
| 31 Aug 2026 | 100.0% | 90 |
| 30 Aug 2026 | 99.7% | 90 |
| 29 Aug 2026 | 100.0% | 90 |