BARRA GRANDE
Santa Catarina · URUGUAI
Capacity
4,904.45 hm³
Coordinates
-27.777°N, 51.189°W
Operator
ONS
Current fill
35.7%vs 7 days ago
-0.9%losing
vs 1 year ago
-24.6%year-over-year
7-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 June 10, 2026, BARRA GRANDE is filled to 35.7% of its total capacity, holding roughly 782 hm³ of water out of a maximum 4,904 hm³. At this level the reservoir is low. 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 (-0.9 pts), and it is 24.6 points below its level on the same date a year earlier.
Across the readings we hold for BARRA GRANDE — 52 data points between June 27, 2025 and June 10, 2026 — the level has ranged from a low of 29.4% (March 13, 2026) to a high of 99.7% (July 4, 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
- 35.7%
- Water stored
- 782 hm³
- Total capacity
- 4,904 hm³
- Usable capacity
- 2,193 hm³
- 7-day change
- ▼ 0.9 pts
- Year-on-year
- ▼ 24.6 pts
- Primary use
- Hydroelectric power
- River
- PELOTAS
- River basin
- URUGUAI
- Operator
- ONS
- Coordinates
- 27.777°S, 51.189°W
- Last updated
- June 10, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 10 Jun 2026 | 35.7% | 782 |
| 5 Jun 2026 | 36.6% | 802 |
| 29 May 2026 | 36.5% | 801 |
| 22 May 2026 | 35.9% | 786 |
| 15 May 2026 | 37.2% | 817 |
| 8 May 2026 | 35.9% | 788 |
| 1 May 2026 | 32.4% | 711 |
| 24 Apr 2026 | 32.9% | 722 |
| 17 Apr 2026 | 33.8% | 741 |
| 10 Apr 2026 | 33.5% | 735 |
| 3 Apr 2026 | 33.4% | 733 |
| 27 Mar 2026 | 32.6% | 715 |
Frequently asked questions
What is the current water level of BARRA GRANDE?
As of June 10, 2026, BARRA GRANDE is at 35.7% of its capacity, holding approximately 782 hm³ of water, according to ONS – Operador Nacional do Sistema Elétrico data.
Is BARRA GRANDE reservoir full?
No. As of June 10, 2026, BARRA GRANDE is low at 35.7% of its capacity, so it is not full.
Is the water level at BARRA GRANDE rising or falling?
The level at BARRA GRANDE has been broadly stable over the latest week on record (-0.9 points).
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.