Reservoir · New South Wales · Australia · BOM Water Data Online
Nepean
70.6% full
Capacity
68.1 hm³
Volume stored
48 hm³
River
Nepean River
Year completed
1935
Coordinates
34.369°S, 150.582°E
Last updated
2026-10-26
Current fill
70.6%vs 7 days ago
-0.5 pplosing
vs 1 year ago
-27.7 ppyear-over-year
7-day trend
→stable
Drought context
Storage vs October average
83%of normal
70.6% full on 2026-10-26, against an average of 85.1% for October across 4 years of readings (-14.5 points).
Rain over the last three months · 11 October 2026
Near normal
In the three months to 11 October 2026 the area around Nepean 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 −0.29). 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. 34.369°S, 150.582°E · Open in Google Maps
About Nepean
As of October 26, 2026, Nepean is filled to 70.6% of its total capacity, holding 48.06 hm³ of water out of a maximum 68.1 hm³. At this level the reservoir is within its normal operating range.
Over the most recent week on record the fill level has held broadly steady (-0.5 pp), and it is 27.7 points below its level on the same date a year earlier.
Across the readings we hold for Nepean — 1093 data points between October 28, 2023 and October 26, 2026 — the level has ranged from a low of 68.5% (November 18, 2023) to a high of 105.4% (June 7, 2024). On average the reservoir is fullest around June and at its lowest around November.
The dam at Nepean was completed in 1935. It is operated by BOM primarily for water supply. It lies within the Nepean River Basin basin at 34.369°S, 150.582°E.
Key facts
- Current fill level
- 70.6% of total capacity
- Water stored
- 48.06 hm³
- Total capacity
- 68.1 hm³
- 7-day change
- ▼ 0.5 pp
- Year-on-year
- ▼ 27.7 pp
- Primary use
- Water supply
- River
- Nepean River
- River basin
- Nepean River Basin
- Year completed
- 1935
- Operator
- BOM
- Coordinates
- 34.369°S, 150.582°E
- Last updated
- October 26, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 26 Oct 2026 | 70.6% | 48.06 |
| 25 Oct 2026 | 70.6% | 48.1 |
| 24 Oct 2026 | 70.7% | 48.14 |
| 23 Oct 2026 | 70.8% | 48.18 |
| 22 Oct 2026 | 70.8% | 48.2 |
| 21 Oct 2026 | 70.9% | 48.26 |
| 20 Oct 2026 | 71.0% | 48.35 |
| 19 Oct 2026 | 71.1% | 48.45 |
| 18 Oct 2026 | 71.2% | 48.52 |
| 17 Oct 2026 | 71.4% | 48.59 |
| 16 Oct 2026 | 71.5% | 48.66 |
| 15 Oct 2026 | 71.6% | 48.73 |