RONDON II
Rondônia · AMAZONAS
Capacity
478.29 hm³
Coordinates
-11.997°N, 60.697°W
Operator
ONS
49.6% full
Current fill
49.6%vs 7 days ago
-2.0%losing
vs 1 year ago
N/A7-day trend
↓falling
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 September 9, 2026, RONDON II is filled to 49.6% of its total capacity, holding roughly 142 hm³ of water out of a maximum 478 hm³. At this level the reservoir is within its normal operating range. Of that total, about 286 hm³ is usable (live) storage.
Over the most recent week on record the fill level has fallen by 2.0 percentage points.
Across the readings we hold for RONDON II — 52 data points between September 26, 2025 and September 9, 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
- 49.6%
- Water stored
- 142 hm³
- Total capacity
- 478 hm³
- Usable capacity
- 286 hm³
- 7-day change
- ▼ 2.0 pts
- Primary use
- Hydroelectric power
- River
- JI-PARANA
- River basin
- AMAZONAS
- Operator
- ONS
- Coordinates
- 11.997°S, 60.697°W
- Last updated
- September 9, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 9 Sep 2026 | 49.6% | 142 |
| 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 |
| 24 Jul 2026 | 73.5% | 210 |
| 17 Jul 2026 | 78.3% | 224 |
| 10 Jul 2026 | 80.7% | 231 |
| 3 Jul 2026 | 83.4% | 239 |
| 26 Jun 2026 | 86.4% | 247 |