RONDON II
Rondônia · AMAZONAS
Useful capacity
286.12 hm³
Coordinates
11.997°S, 60.697°W
Operator
ONS
36.4% of useful capacity
Current fill
36.4%of useful capacity
vs 7 days ago
-0.8 pplosing
vs 1 year ago
+11.0 ppyear-over-year
7-day trend
→stable
Drought context
Storage vs October average
116%of normal
36.4% full on 2026-10-26, against an average of 31.5% for October across 2 years of readings (+4.9 points).
Rain over the last three months · 11 October 2026
Moderately dry
In the three months to 11 October 2026 the area around RONDON II had well below normal rain, a shortfall seen about one year in six. Rainfall compared with the long-run record for the same season at this point (Copernicus Global Drought Observatory, SPI-3 index −1.33). 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°S, 60.697°W · Open in Google Maps
About RONDON II
As of October 26, 2026, RONDON II is at 36.4% of useful capacity, holding 104.1 hm³ of 286.12 hm³. Of the 478.29 hm³ total capacity, that is 21.8%. At this level the reservoir is low.
Over the most recent week on record the fill level has held broadly steady (-0.8 pp), and it is 11.0 points above its level on the same date a year earlier.
Across the readings we hold for RONDON II — 65 data points between October 26, 2025 and October 26, 2026 — the level has ranged from a low of 15.2% (November 28, 2025) to a high of 104.9% (April 23, 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
- 36.4% of useful capacity
- Water stored
- 104.1 hm³
- Total capacity
- 478.29 hm³
- Usable capacity
- 286.12 hm³
- 7-day change
- ▼ 0.8 pp
- Year-on-year
- ▲ 11.0 pp
- Primary use
- Hydroelectric power
- River
- JI-PARANA
- River basin
- AMAZONAS
- Operator
- ONS
- Coordinates
- 11.997°S, 60.697°W
- Last updated
- October 26, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 26 Oct 2026 | 36.4% | 104.1 |
| 25 Oct 2026 | 36.6% | 104.7 |
| 24 Oct 2026 | 36.8% | 105.3 |
| 23 Oct 2026 | 37.2% | 106.4 |
| 22 Oct 2026 | 37.0% | 105.8 |
| 21 Oct 2026 | 36.6% | 104.7 |
| 20 Oct 2026 | 37.0% | 105.8 |
| 19 Oct 2026 | 37.2% | 106.4 |
| 18 Oct 2026 | 37.2% | 106.4 |
| 17 Oct 2026 | 36.8% | 105.3 |
| 16 Oct 2026 | 37.0% | 105.8 |
| 15 Oct 2026 | 36.8% | 105.3 |