JIRAU
Rondônia · AMAZONAS
Useful capacity
1,511.14 hm³
Coordinates
9.268°S, 64.649°W
Operator
ONS
0.9% of useful capacity
Current fill
0.9%of useful capacity
vs 7 days ago
-0.1 pplosing
vs 1 year ago
0.0 ppyear-over-year
7-day trend
→stable
Drought context
Storage vs October average
100%of normal
0.9% full on 2026-10-26, against an average of 0.9% for October across 2 years of readings (0.0 points).
Rain over the last three months · 11 October 2026
Extremely dry
In the three months to 11 October 2026 the area around JIRAU had extremely little rain for the season, a shortfall seen about one year in forty. Rainfall compared with the long-run record for the same season at this point (Copernicus Global Drought Observatory, SPI-3 index −2.44). Rain, not storage. Brazil drought figures →
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Technical specifications
| Total capacity | 2,747 hm³ |
| Usable capacity | 1,511 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°S, 64.649°W · Open in Google Maps
About JIRAU
As of October 26, 2026, JIRAU is at 0.9% of useful capacity, holding 14.2 hm³ of 1,511 hm³. Of the 2,747 hm³ total capacity, that is 0.5%. At this level the reservoir is critically low.
Over the most recent week on record the fill level has held broadly steady (-0.1 pp), and it sits close to where it was a year earlier.
Across the readings we hold for JIRAU — 65 data points between October 26, 2025 and October 26, 2026 — the level has ranged from a low of 0.9% (October 26, 2025) to a high of 100.2% (February 20, 2026). On average the reservoir is fullest around February and at its lowest around September.
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% of useful capacity
- Water stored
- 14.2 hm³
- Total capacity
- 2,747 hm³
- Usable capacity
- 1,511 hm³
- 7-day change
- ▼ 0.1 pp
- Year-on-year
- No change
- Primary use
- Hydroelectric power
- River
- MADEIRA
- River basin
- AMAZONAS
- Operator
- ONS
- Coordinates
- 9.268°S, 64.649°W
- Last updated
- October 26, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 26 Oct 2026 | 0.9% | 14.2 |
| 25 Oct 2026 | 0.9% | 14.2 |
| 24 Oct 2026 | 0.9% | 14.2 |
| 23 Oct 2026 | 0.9% | 14.2 |
| 22 Oct 2026 | 0.9% | 14.2 |
| 21 Oct 2026 | 0.9% | 14.2 |
| 20 Oct 2026 | 1.0% | 15.6 |
| 19 Oct 2026 | 1.0% | 15.6 |
| 18 Oct 2026 | 0.9% | 14.2 |
| 17 Oct 2026 | 0.9% | 14.2 |
| 16 Oct 2026 | 0.9% | 14.2 |
| 15 Oct 2026 | 0.9% | 14.2 |