BARRA GRANDE
Santa Catarina · URUGUAI
Capacity
4,904.45 hm³
Coordinates
-27.777°N, 51.189°W
Operator
ONS
99.4% full
Current fill
99.4%vs 7 days ago
+3.2%gaining
vs 1 year ago
+5.1%year-over-year
7-day trend
↑rising
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 July 28, 2026, BARRA GRANDE is filled to 99.4% of its total capacity, holding roughly 2,180 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 risen by 3.2 percentage points, and it is 5.1 points above its level on the same date a year earlier.
Across the readings we hold for BARRA GRANDE — 52 data points between August 15, 2025 and July 28, 2026 — the level has ranged from a low of 29.4% (March 13, 2026) to a high of 99.7% (September 12, 2025). On average the reservoir is fullest around September 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
- 99.4%
- Water stored
- 2,180 hm³
- Total capacity
- 4,904 hm³
- Usable capacity
- 2,193 hm³
- 7-day change
- ▲ 3.2 pts
- Year-on-year
- ▲ 5.1 pts
- Primary use
- Hydroelectric power
- River
- PELOTAS
- River basin
- URUGUAI
- Operator
- ONS
- Coordinates
- 27.777°S, 51.189°W
- Last updated
- July 28, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 28 Jul 2026 | 99.4% | 2,180 |
| 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 |
| 26 Jun 2026 | 34.2% | 751 |
| 19 Jun 2026 | 34.2% | 750 |
| 12 Jun 2026 | 34.7% | 762 |
| 5 Jun 2026 | 36.6% | 802 |
| 29 May 2026 | 36.5% | 801 |
| 22 May 2026 | 35.9% | 786 |
| 15 May 2026 | 37.2% | 817 |
Frequently asked questions
What is the current water level of BARRA GRANDE?
As of July 28, 2026, BARRA GRANDE is at 99.4% of its capacity, holding approximately 2,180 hm³ of water, according to ONS – Operador Nacional do Sistema Elétrico data.
Is BARRA GRANDE reservoir full?
BARRA GRANDE is essentially full, sitting at 99.4% of capacity as of July 28, 2026.
Is the water level at BARRA GRANDE rising or falling?
The level at BARRA GRANDE is rising — it gained 3.2 percentage points over the latest week on record.
How much water can BARRA GRANDE hold?
BARRA GRANDE has a total capacity of 4,904 hm³, of which about 2,193 hm³ is usable storage.
Where is BARRA GRANDE reservoir located?
BARRA GRANDE is located in Santa Catarina, Brazil, within the URUGUAI basin (coordinates 27.777°S, 51.189°W).
What is BARRA GRANDE used for?
BARRA GRANDE is used primarily for hydroelectric power, and is managed by ONS.