Reservoir · New South Wales · Australia · BOM Water Data Online
Tallowa
99.8% full
Capacity
90 hm³
Volume stored
90 hm³
River
Shoalhaven River
Year completed
1976
Coordinates
34.749°S, 150.346°E
Last updated
2026-10-26
Current fill
99.8%vs 7 days ago
+0.3 ppgaining
vs 1 year ago
-0.5 ppyear-over-year
7-day trend
→stable
Drought context
Storage vs October average
100%of normal
99.8% full on 2026-10-26, against an average of 99.7% for October across 4 years of readings (+0.1 points).
Rain over the last three months · 11 October 2026
Near normal
In the three months to 11 October 2026 the area around Tallowa 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 −0.34). 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. 34.749°S, 150.346°E · Open in Google Maps
About Tallowa
As of October 26, 2026, Tallowa is filled to 99.8% of its total capacity, holding 89.82 hm³ of water out of a maximum 90 hm³. At this level the reservoir is high. Of that total, 83.7 hm³ is usable (live) storage.
Over the most recent week on record the fill level has held broadly steady (+0.3 pp), and it sits close to where it was a year earlier.
Across the readings we hold for Tallowa — 1095 data points between October 28, 2023 and October 26, 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
- 99.8% of total capacity
- Water stored
- 89.82 hm³
- Total capacity
- 90 hm³
- Usable capacity
- 83.7 hm³
- 7-day change
- ▲ 0.3 pp
- Year-on-year
- ▼ 0.5 pp
- 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
- October 26, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 26 Oct 2026 | 99.8% | 89.82 |
| 25 Oct 2026 | 99.8% | 89.84 |
| 24 Oct 2026 | 99.9% | 89.91 |
| 23 Oct 2026 | 100.0% | 89.97 |
| 22 Oct 2026 | 99.9% | 89.89 |
| 21 Oct 2026 | 99.9% | 89.89 |
| 20 Oct 2026 | 99.9% | 89.93 |
| 19 Oct 2026 | 99.5% | 89.54 |
| 18 Oct 2026 | 99.9% | 89.88 |
| 17 Oct 2026 | 100.0% | 90.01 |
| 16 Oct 2026 | 100.1% | 90.09 |
| 15 Oct 2026 | 100.2% | 90.21 |