JIRAU
Rondônia · AMAZONAS
Capacity
2,746.73 hm³
Coordinates
-9.268°N, 64.649°W
Operator
ONS
0.9% full
Current fill
0.9%vs 7 days ago
0.0%stable
vs 1 year ago
N/A7-day trend
→stable
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Technical specifications
| Total capacity | 2,746.73 hm³ |
| Usable capacity | 1,511.14 hm³ |
| Primary use | Hydroelectric |
| Operator | ONS |
| River | MADEIRA |
| Province | Rondônia |
| River basin | AMAZONAS |
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. -9.268, -64.649 · Open in Google Maps
About JIRAU
As of September 9, 2026, JIRAU is filled to 0.9% of its total capacity, holding roughly 14 hm³ of water out of a maximum 2,747 hm³. At this level the reservoir is critically low. Of that total, about 1,511 hm³ is usable (live) storage.
Over the most recent week on record the fill level has held broadly steady (+0.0 pts).
Across the readings we hold for JIRAU — 52 data points between September 26, 2025 and September 9, 2026 — the level has ranged from a low of 0.9% (September 26, 2025) to a high of 100.2% (February 20, 2026). On average the reservoir is fullest around February and at its lowest around October.
It is operated by ONS primarily for hydroelectric power. It lies within the AMAZONAS basin at 9.268°S, 64.649°W.
Key facts
- Current fill level
- 0.9%
- Water stored
- 14 hm³
- Total capacity
- 2,747 hm³
- Usable capacity
- 1,511 hm³
- 7-day change
- No change
- Primary use
- Hydroelectric power
- River
- MADEIRA
- River basin
- AMAZONAS
- Operator
- ONS
- Coordinates
- 9.268°S, 64.649°W
- Last updated
- September 9, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 9 Sep 2026 | 0.9% | 14 |
| 4 Sep 2026 | 0.9% | 14 |
| 28 Aug 2026 | 0.9% | 14 |
| 21 Aug 2026 | 0.9% | 14 |
| 14 Aug 2026 | 2.2% | 34 |
| 7 Aug 2026 | 11.7% | 177 |
| 31 Jul 2026 | 22.3% | 336 |
| 24 Jul 2026 | 34.1% | 515 |
| 17 Jul 2026 | 47.6% | 719 |
| 10 Jul 2026 | 62.9% | 951 |
| 3 Jul 2026 | 80.3% | 1,213 |
| 26 Jun 2026 | 100.0% | 1,511 |