BARRA GRANDE
Santa Catarina · URUGUAI
Useful capacity
2,046.59 hm³
Coordinates
27.777°S, 51.189°W
Operator
ONS
90.6% of useful capacity
Current fill
90.6%of useful capacity
vs 7 days ago
-3.1 pplosing
vs 1 year ago
-3.8 ppyear-over-year
7-day trend
↓falling
Drought context
Storage vs October average
97%of normal
90.6% full on 2026-10-27, against an average of 93.2% for October across 2 years of readings (-2.6 points).
Rain over the last three months · 11 October 2026
Very wet
In the three months to 11 October 2026 the area around BARRA GRANDE had much more rain than normal, seen about one year in fifteen. Rainfall compared with the long-run record for the same season at this point (Copernicus Global Drought Observatory, SPI-3 index +1.65). Rain, not storage. Brazil drought figures →
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Technical specifications
| Total capacity | 4,784 hm³ |
| Usable capacity | 2,047 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°S, 51.189°W · Open in Google Maps
About BARRA GRANDE
As of October 27, 2026, BARRA GRANDE is at 90.6% of useful capacity, holding 1,853 hm³ of 2,047 hm³. Of the 4,784 hm³ total capacity, that is 38.7%. At this level the reservoir is high.
Over the most recent week on record the fill level has fallen by 3.1 percentage points, and it is 3.8 points below its level on the same date a year earlier.
Across the readings we hold for BARRA GRANDE — 65 data points between October 27, 2025 and October 27, 2026 — the level has ranged from a low of 29.4% (March 13, 2026) to a high of 98.7% (November 14, 2025). On average the reservoir is fullest around November 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
- 90.6% of useful capacity
- Water stored
- 1,853 hm³
- Total capacity
- 4,784 hm³
- Usable capacity
- 2,047 hm³
- 7-day change
- ▼ 3.1 pp
- Year-on-year
- ▼ 3.8 pp
- Primary use
- Hydroelectric power
- River
- PELOTAS
- River basin
- URUGUAI
- Operator
- ONS
- Coordinates
- 27.777°S, 51.189°W
- Last updated
- October 27, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 27 Oct 2026 | 90.5% | 1,853 |
| 26 Oct 2026 | 90.9% | 1,860 |
| 25 Oct 2026 | 91.2% | 1,866 |
| 24 Oct 2026 | 90.9% | 1,860 |
| 23 Oct 2026 | 90.8% | 1,858 |
| 22 Oct 2026 | 91.3% | 1,868 |
| 21 Oct 2026 | 92.6% | 1,895 |
| 20 Oct 2026 | 93.7% | 1,917 |
| 19 Oct 2026 | 93.7% | 1,917 |
| 18 Oct 2026 | 93.6% | 1,915 |
| 17 Oct 2026 | 93.4% | 1,912 |
| 16 Oct 2026 | 92.7% | 1,896 |