Reservoir · New South Wales · Australia · BOM Water Data Online
Nepean
82.7% full
Capacity
68.1 hm³
Volume stored
56 hm³
River
Nepean River
Year completed
1935
Coordinates
34.369°S, 150.582°E
Last updated
2026-07-29
Current fill
82.7%vs 7 days ago
-0.1%losing
vs 1 year ago
-6.5%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: 2026-07-29.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. -34.369, 150.582 · Open in Google Maps
About Nepean
As of July 29, 2026, Nepean is filled to 82.7% of its total capacity, holding roughly 56 hm³ of water out of a maximum 68 hm³. At this level the reservoir is high.
Over the most recent week on record the fill level has held broadly steady (-0.1 pts), and it is 6.5 points below its level on the same date a year earlier.
Across the readings we hold for Nepean — 1096 data points between July 30, 2023 and July 29, 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
- 82.7%
- Water stored
- 56 hm³
- Total capacity
- 68 hm³
- 7-day change
- ▼ 0.1 pts
- Year-on-year
- ▼ 6.5 pts
- 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
- July 29, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 29 Jul 2026 | 82.7% | 56 |
| 28 Jul 2026 | 82.8% | 56 |
| 27 Jul 2026 | 82.9% | 56 |
| 26 Jul 2026 | 83.0% | 56 |
| 25 Jul 2026 | 83.0% | 57 |
| 24 Jul 2026 | 83.1% | 57 |
| 23 Jul 2026 | 83.2% | 57 |
| 22 Jul 2026 | 83.3% | 57 |
| 21 Jul 2026 | 83.4% | 57 |
| 20 Jul 2026 | 83.6% | 57 |
| 19 Jul 2026 | 83.6% | 57 |
| 18 Jul 2026 | 83.7% | 57 |
Frequently asked questions
What is the current water level of Nepean?
As of July 29, 2026, Nepean is at 82.7% of its capacity, holding approximately 56 hm³ of water, according to BOM data.
Is Nepean reservoir full?
No. As of July 29, 2026, Nepean is high at 82.7% of its capacity, so it is not full.
Is the water level at Nepean rising or falling?
The level at Nepean has been broadly stable over the latest week on record (-0.1 points).
How much water can Nepean hold?
Nepean has a total capacity of 68 hm³.
Where is Nepean reservoir located?
Nepean is located in New South Wales, Australia, within the Nepean River Basin basin (coordinates 34.369°S, 150.582°E).
When was Nepean dam built?
The dam at Nepean was completed in 1935.
What is Nepean used for?
Nepean is used primarily for water supply, and is managed by BOM.