Reservoir · Victoria · Australia · BOM Water Data Online
Yan Yean
66.9% full
Capacity
33.1 hm³
Volume stored
22 hm³
River
Off-stream
Year completed
1857
Coordinates
37.555°S, 145.138°E
Last updated
2026-09-08
Current fill
66.9%vs 7 days ago
+0.1%gaining
vs 1 year ago
+2.7%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: 2026-09-08.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. -37.555, 145.138 · Open in Google Maps
About Yan Yean
As of September 8, 2026, Yan Yean is filled to 66.9% of its total capacity, holding roughly 22 hm³ of water out of a maximum 33 hm³. At this level the reservoir is within its normal operating range. Of that total, about 30 hm³ is usable (live) storage.
Over the most recent week on record the fill level has held broadly steady (+0.1 pts), and it is 2.7 points above its level on the same date a year earlier.
Across the readings we hold for Yan Yean — 1068 data points between September 11, 2023 and September 8, 2026 — the level has ranged from a low of 52.4% (March 26, 2026) to a high of 89.5% (January 9, 2024). On average the reservoir is fullest around October and at its lowest around May.
The dam at Yan Yean was completed in 1857. It is operated by BOM primarily for water supply. It lies within the Off-stream Basin basin at 37.555°S, 145.138°E.
Key facts
- Current fill level
- 66.9%
- Water stored
- 22 hm³
- Total capacity
- 33 hm³
- Usable capacity
- 30 hm³
- 7-day change
- ▲ 0.1 pts
- Year-on-year
- ▲ 2.7 pts
- Primary use
- Water supply
- River
- Off-stream
- River basin
- Off-stream Basin
- Year completed
- 1857
- Operator
- BOM
- Coordinates
- 37.555°S, 145.138°E
- Last updated
- September 8, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 8 Sep 2026 | 66.9% | 22 |
| 7 Sep 2026 | 66.9% | 22 |
| 6 Sep 2026 | 66.9% | 22 |
| 5 Sep 2026 | 66.9% | 22 |
| 4 Sep 2026 | 66.9% | 22 |
| 3 Sep 2026 | 66.9% | 22 |
| 2 Sep 2026 | 66.9% | 22 |
| 1 Sep 2026 | 66.8% | 22 |
| 31 Aug 2026 | 66.7% | 22 |
| 30 Aug 2026 | 66.5% | 22 |
| 29 Aug 2026 | 66.3% | 22 |
| 28 Aug 2026 | 66.1% | 22 |