ROSANA
Paraná · PARANAPANEMA
Capacity
1,918 hm³
Coordinates
-22.602°N, 52.869°W
Operator
ONS
73.2% full
Current fill
73.2%vs 7 days ago
-20.9%losing
vs 1 year ago
N/A7-day trend
↓falling
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Technical specifications
| Total capacity | 1,918 hm³ |
| Usable capacity | 407.56 hm³ |
| Primary use | Hydroelectric |
| Operator | ONS |
| River | PARANAPANEMA |
| Province | Paraná |
| River basin | PARANAPANEMA |
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. -22.602, -52.869 · Open in Google Maps
About ROSANA
As of September 9, 2026, ROSANA is filled to 73.2% of its total capacity, holding roughly 298 hm³ of water out of a maximum 1,918 hm³. At this level the reservoir is within its normal operating range. Of that total, about 408 hm³ is usable (live) storage.
Over the most recent week on record the fill level has fallen by 20.9 percentage points.
Across the readings we hold for ROSANA — 52 data points between September 26, 2025 and September 9, 2026 — the level has ranged from a low of 71.7% (December 26, 2025) to a high of 97.3% (March 13, 2026). On average the reservoir is fullest around March and at its lowest around July.
It is operated by ONS primarily for hydroelectric power. It lies within the PARANAPANEMA basin at 22.602°S, 52.869°W.
Key facts
- Current fill level
- 73.2%
- Water stored
- 298 hm³
- Total capacity
- 1,918 hm³
- Usable capacity
- 408 hm³
- 7-day change
- ▼ 20.9 pts
- Primary use
- Hydroelectric power
- River
- PARANAPANEMA
- River basin
- PARANAPANEMA
- Operator
- ONS
- Coordinates
- 22.602°S, 52.869°W
- Last updated
- September 9, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 9 Sep 2026 | 73.2% | 298 |
| 4 Sep 2026 | 94.2% | 384 |
| 28 Aug 2026 | 83.1% | 339 |
| 21 Aug 2026 | 74.8% | 305 |
| 14 Aug 2026 | 87.8% | 358 |
| 7 Aug 2026 | 79.4% | 324 |
| 31 Jul 2026 | 74.2% | 303 |
| 24 Jul 2026 | 87.3% | 356 |
| 17 Jul 2026 | 78.9% | 322 |
| 10 Jul 2026 | 75.8% | 309 |
| 3 Jul 2026 | 73.7% | 301 |
| 26 Jun 2026 | 83.1% | 339 |