Reservoir · Victoria · Australia · BOM Water Data Online
Yan Yean
62.2% full
Capacity
33.1 hm³
Volume stored
21 hm³
River
Off-stream
Year completed
1857
Coordinates
37.555°S, 145.138°E
Last updated
2026-07-27
Current fill
62.2%vs 7 days ago
+0.2%gaining
vs 1 year ago
+8.7%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: 2026-07-27.
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 July 27, 2026, Yan Yean is filled to 62.2% of its total capacity, holding roughly 21 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 (+0.2 pts), and it is 8.7 points above its level on the same date a year earlier.
Across the readings we hold for Yan Yean — 1071 data points between July 30, 2023 and July 27, 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 August 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
- 62.2%
- Water stored
- 21 hm³
- Total capacity
- 33 hm³
- Usable capacity
- 30 hm³
- 7-day change
- ▲ 0.2 pts
- Year-on-year
- ▲ 8.7 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
- July 27, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 27 Jul 2026 | 62.2% | 21 |
| 26 Jul 2026 | 62.0% | 21 |
| 25 Jul 2026 | 61.7% | 20 |
| 24 Jul 2026 | 61.5% | 20 |
| 23 Jul 2026 | 61.3% | 20 |
| 22 Jul 2026 | 61.2% | 20 |
| 21 Jul 2026 | 61.0% | 20 |
| 20 Jul 2026 | 60.7% | 20 |
| 19 Jul 2026 | 60.5% | 20 |
| 18 Jul 2026 | 60.3% | 20 |
| 17 Jul 2026 | 60.0% | 20 |
| 16 Jul 2026 | 59.7% | 20 |
Frequently asked questions
What is the current water level of Yan Yean?
As of July 27, 2026, Yan Yean is at 62.2% of its capacity, holding approximately 21 hm³ of water, according to BOM data.
Is Yan Yean reservoir full?
No. As of July 27, 2026, Yan Yean is within its normal operating range at 62.2% of its capacity, so it is not full.
Is the water level at Yan Yean rising or falling?
The level at Yan Yean has been broadly stable over the latest week on record (+0.2 points).
How much water can Yan Yean hold?
Yan Yean has a total capacity of 33 hm³, of which about 30 hm³ is usable storage.
Where is Yan Yean reservoir located?
Yan Yean is located in Victoria, Australia, within the Off-stream Basin basin (coordinates 37.555°S, 145.138°E).
When was Yan Yean dam built?
The dam at Yan Yean was completed in 1857.
What is Yan Yean used for?
Yan Yean is used primarily for water supply, and is managed by BOM.