RONDON II
Rondônia · AMAZONAS
Capacity
478.29 hm³
Coordinates
-11.997°N, 60.697°W
Operator
ONS
Current fill
92.1%vs 7 days ago
-1.5%losing
vs 1 year ago
-10.1%year-over-year
7-day trend
→stable
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 June 10, 2026, RONDON II is filled to 92.1% of its total capacity, holding roughly 264 hm³ of water out of a maximum 478 hm³. At this level the reservoir is high. Of that total, about 286 hm³ is usable (live) storage.
Over the most recent week on record the fill level has held broadly steady (-1.5 pts), and it is 10.1 points below its level on the same date a year earlier.
Across the readings we hold for RONDON II — 52 data points between June 27, 2025 and June 10, 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
- 92.1%
- Water stored
- 264 hm³
- Total capacity
- 478 hm³
- Usable capacity
- 286 hm³
- 7-day change
- ▼ 1.5 pts
- Year-on-year
- ▼ 10.1 pts
- Primary use
- Hydroelectric power
- River
- JI-PARANA
- River basin
- AMAZONAS
- Operator
- ONS
- Coordinates
- 11.997°S, 60.697°W
- Last updated
- June 10, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 10 Jun 2026 | 92.1% | 264 |
| 5 Jun 2026 | 93.6% | 268 |
| 29 May 2026 | 94.3% | 270 |
| 22 May 2026 | 95.8% | 274 |
| 15 May 2026 | 94.3% | 270 |
| 8 May 2026 | 97.3% | 278 |
| 1 May 2026 | 100.5% | 288 |
| 24 Apr 2026 | 105.0% | 300 |
| 17 Apr 2026 | 101.9% | 292 |
| 10 Apr 2026 | 97.5% | 279 |
| 3 Apr 2026 | 100.0% | 286 |
| 27 Mar 2026 | 102.2% | 292 |
Frequently asked questions
What is the current water level of RONDON II?
As of June 10, 2026, RONDON II is at 92.1% of its capacity, holding approximately 264 hm³ of water, according to ONS – Operador Nacional do Sistema Elétrico data.
Is RONDON II reservoir full?
No. As of June 10, 2026, RONDON II is high at 92.1% of its capacity, so it is not full.
Is the water level at RONDON II rising or falling?
The level at RONDON II has been broadly stable over the latest week on record (-1.5 points).
How much water can RONDON II hold?
RONDON II has a total capacity of 478 hm³, of which about 286 hm³ is usable storage.
Where is RONDON II reservoir located?
RONDON II is located in Rondônia, Brazil, within the AMAZONAS basin (coordinates 11.997°S, 60.697°W).
What is RONDON II used for?
RONDON II is used primarily for hydroelectric power, and is managed by ONS.