RONDON II
Rondônia · AMAZONAS
Capacity
478.29 hm³
Coordinates
-11.997°N, 60.697°W
Operator
ONS
38.4% full
Current fill
38.4%vs 7 days ago
-5.2%losing
vs 1 year ago
N/A7-day trend
↓falling
Drought context
Storage vs October average
136%of normal
38.4% full on 2026-10-12, against an average of 28.3% for October across 2 years of readings (+10.1 points).
Rain over the last three months · 21 September 2026
Near normal
In the three months to 21 September 2026 the area around RONDON II had rain close to normal for the season. Rainfall compared with the long-run record for the same season at this point (Copernicus Global Drought Observatory, SPI-3 index −0.48). Rain, not storage. Brazil drought figures →
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Technical specifications
| Total capacity | 478.29 hm³ |
| Usable capacity | 286.12 hm³ |
| Primary use | Hydroelectric |
| Operator | ONS |
| River | JI-PARANA |
| Province | Rondônia |
| River basin | AMAZONAS |
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. -11.997, -60.697 · Open in Google Maps
About RONDON II
As of October 12, 2026, RONDON II is filled to 38.4% of its total capacity, holding roughly 110 hm³ of water out of a maximum 478 hm³. At this level the reservoir is low. Of that total, about 286 hm³ is usable (live) storage.
Over the most recent week on record the fill level has fallen by 5.2 percentage points.
Across the readings we hold for RONDON II — 52 data points between October 31, 2025 and October 12, 2026 — the level has ranged from a low of 15.2% (November 28, 2025) to a high of 105.0% (April 24, 2026). On average the reservoir is fullest around April and at its lowest around November.
It is operated by ONS primarily for hydroelectric power. It lies within the AMAZONAS basin at 11.997°S, 60.697°W.
Key facts
- Current fill level
- 38.4%
- Water stored
- 110 hm³
- Total capacity
- 478 hm³
- Usable capacity
- 286 hm³
- 7-day change
- ▼ 5.2 pts
- Primary use
- Hydroelectric power
- River
- JI-PARANA
- River basin
- AMAZONAS
- Operator
- ONS
- Coordinates
- 11.997°S, 60.697°W
- Last updated
- October 12, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 12 Oct 2026 | 38.4% | 110 |
| 9 Oct 2026 | 40.0% | 114 |
| 2 Oct 2026 | 43.6% | 125 |
| 25 Sep 2026 | 46.4% | 133 |
| 18 Sep 2026 | 46.0% | 132 |
| 11 Sep 2026 | 48.4% | 138 |
| 4 Sep 2026 | 51.6% | 148 |
| 28 Aug 2026 | 56.3% | 161 |
| 21 Aug 2026 | 60.1% | 172 |
| 14 Aug 2026 | 62.6% | 179 |
| 7 Aug 2026 | 65.0% | 186 |
| 31 Jul 2026 | 66.4% | 190 |