JIRAU
Rondônia · AMAZONAS
Capacity
2,746.73 hm³
Coordinates
-9.268°N, 64.649°W
Operator
ONS
27.1% full
Current fill
27.1%vs 7 days ago
-7.0%losing
vs 1 year ago
+26.2%year-over-year
7-day trend
↓falling
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 July 28, 2026, JIRAU is filled to 27.1% of its total capacity, holding roughly 410 hm³ of water out of a maximum 2,747 hm³. At this level the reservoir is low. Of that total, about 1,511 hm³ is usable (live) storage.
Over the most recent week on record the fill level has fallen by 7.0 percentage points, and it is 26.2 points above its level on the same date a year earlier.
Across the readings we hold for JIRAU — 52 data points between August 15, 2025 and July 28, 2026 — the level has ranged from a low of 0.9% (August 15, 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
- 27.1%
- Water stored
- 410 hm³
- Total capacity
- 2,747 hm³
- Usable capacity
- 1,511 hm³
- 7-day change
- ▼ 7.0 pts
- Year-on-year
- ▲ 26.2 pts
- Primary use
- Hydroelectric power
- River
- MADEIRA
- River basin
- AMAZONAS
- Operator
- ONS
- Coordinates
- 9.268°S, 64.649°W
- Last updated
- July 28, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 28 Jul 2026 | 27.1% | 410 |
| 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 |
| 19 Jun 2026 | 100.0% | 1,511 |
| 12 Jun 2026 | 100.0% | 1,511 |
| 5 Jun 2026 | 100.0% | 1,511 |
| 29 May 2026 | 100.0% | 1,511 |
| 22 May 2026 | 99.8% | 1,508 |
| 15 May 2026 | 100.0% | 1,511 |
Frequently asked questions
What is the current water level of JIRAU?
As of July 28, 2026, JIRAU is at 27.1% of its capacity, holding approximately 410 hm³ of water, according to ONS – Operador Nacional do Sistema Elétrico data.
Is JIRAU reservoir full?
No. As of July 28, 2026, JIRAU is low at 27.1% of its capacity, so it is not full.
Is the water level at JIRAU rising or falling?
The level at JIRAU is falling — it dropped 7.0 percentage points over the latest week on record.
How much water can JIRAU hold?
JIRAU has a total capacity of 2,747 hm³, of which about 1,511 hm³ is usable storage.
Where is JIRAU reservoir located?
JIRAU is located in Rondônia, Brazil, within the AMAZONAS basin (coordinates 9.268°S, 64.649°W).
What is JIRAU used for?
JIRAU is used primarily for hydroelectric power, and is managed by ONS.