BARRA GRANDE
Santa Catarina · URUGUAI
Capacity
4,904.45 hm³
Coordinates
-27.777°N, 51.189°W
Operator
ONS
93.3% full
Current fill
93.3%vs 7 days ago
+1.4%gaining
vs 1 year ago
N/A7-day trend
→stable
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Technical specifications
| Total capacity | 4,904.45 hm³ |
| Usable capacity | 2,192.66 hm³ |
| Primary use | Hydroelectric |
| Operator | ONS |
| River | PELOTAS |
| Province | Santa Catarina |
| River basin | URUGUAI |
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. -27.777, -51.189 · Open in Google Maps
About BARRA GRANDE
As of September 12, 2026, BARRA GRANDE is filled to 93.3% of its total capacity, holding roughly 2,045 hm³ of water out of a maximum 4,904 hm³. At this level the reservoir is high. Of that total, about 2,193 hm³ is usable (live) storage.
Over the most recent week on record the fill level has held broadly steady (+1.4 pts).
Across the readings we hold for BARRA GRANDE — 52 data points between October 3, 2025 and September 12, 2026 — the level has ranged from a low of 29.4% (March 13, 2026) to a high of 99.4% (October 3, 2025). On average the reservoir is fullest around October and at its lowest around March.
It is operated by ONS primarily for hydroelectric power. It lies within the URUGUAI basin at 27.777°S, 51.189°W.
Key facts
- Current fill level
- 93.3%
- Water stored
- 2,045 hm³
- Total capacity
- 4,904 hm³
- Usable capacity
- 2,193 hm³
- 7-day change
- ▲ 1.4 pts
- Primary use
- Hydroelectric power
- River
- PELOTAS
- River basin
- URUGUAI
- Operator
- ONS
- Coordinates
- 27.777°S, 51.189°W
- Last updated
- September 12, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 12 Sep 2026 | 93.3% | 2,045 |
| 11 Sep 2026 | 92.6% | 2,030 |
| 4 Sep 2026 | 91.9% | 2,015 |
| 28 Aug 2026 | 92.0% | 2,018 |
| 21 Aug 2026 | 95.7% | 2,098 |
| 14 Aug 2026 | 95.8% | 2,100 |
| 7 Aug 2026 | 98.3% | 2,154 |
| 31 Jul 2026 | 95.8% | 2,100 |
| 24 Jul 2026 | 96.2% | 2,109 |
| 17 Jul 2026 | 94.9% | 2,082 |
| 10 Jul 2026 | 83.9% | 1,841 |
| 3 Jul 2026 | 72.3% | 1,585 |