SAO ROQUE
Santa Catarina · URUGUAI
Capacity
795.67 hm³
Coordinates
-27.498°N, 50.805°W
Operator
ONS
105.0% full
Current fill
105.0%vs 7 days ago
0.0%stable
vs 1 year ago
+15.3%year-over-year
7-day trend
→stable
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Technical specifications
| Total capacity | 795.67 hm³ |
| Usable capacity | 458.95 hm³ |
| Primary use | Hydroelectric |
| Operator | ONS |
| River | CANOAS |
| Province | Santa Catarina |
| River basin | URUGUAI |
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. -27.498, -50.805 · Open in Google Maps
About SAO ROQUE
As of July 28, 2026, SAO ROQUE is filled to 105.0% of its total capacity, holding roughly 482 hm³ of water out of a maximum 796 hm³. At this level the reservoir is effectively full. Of that total, about 459 hm³ is usable (live) storage.
Over the most recent week on record the fill level has held broadly steady (+0.0 pts), and it is 15.3 points above its level on the same date a year earlier.
Across the readings we hold for SAO ROQUE — 52 data points between August 15, 2025 and July 28, 2026 — the level has ranged from a low of 18.0% (March 20, 2026) to a high of 105.0% (August 29, 2025). On average the reservoir is fullest around September and at its lowest around April.
It is operated by ONS primarily for hydroelectric power. It lies within the URUGUAI basin at 27.498°S, 50.805°W.
Key facts
- Current fill level
- 105.0%
- Water stored
- 482 hm³
- Total capacity
- 796 hm³
- Usable capacity
- 459 hm³
- 7-day change
- No change
- Year-on-year
- ▲ 15.3 pts
- Primary use
- Hydroelectric power
- River
- CANOAS
- River basin
- URUGUAI
- Operator
- ONS
- Coordinates
- 27.498°S, 50.805°W
- Last updated
- July 28, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 28 Jul 2026 | 105.0% | 482 |
| 24 Jul 2026 | 105.0% | 482 |
| 17 Jul 2026 | 105.0% | 482 |
| 10 Jul 2026 | 105.0% | 482 |
| 3 Jul 2026 | 100.9% | 463 |
| 26 Jun 2026 | 40.3% | 185 |
| 19 Jun 2026 | 40.0% | 184 |
| 12 Jun 2026 | 46.0% | 211 |
| 5 Jun 2026 | 50.4% | 231 |
| 29 May 2026 | 44.3% | 204 |
| 22 May 2026 | 38.3% | 176 |
| 15 May 2026 | 38.9% | 179 |
Frequently asked questions
What is the current water level of SAO ROQUE?
As of July 28, 2026, SAO ROQUE is at 105.0% of its capacity, holding approximately 482 hm³ of water, according to ONS – Operador Nacional do Sistema Elétrico data.
Is SAO ROQUE reservoir full?
SAO ROQUE is essentially full, sitting at 105.0% of capacity as of July 28, 2026.
Is the water level at SAO ROQUE rising or falling?
The level at SAO ROQUE has been broadly stable over the latest week on record (0.0 points).
How much water can SAO ROQUE hold?
SAO ROQUE has a total capacity of 796 hm³, of which about 459 hm³ is usable storage.
Where is SAO ROQUE reservoir located?
SAO ROQUE is located in Santa Catarina, Brazil, within the URUGUAI basin (coordinates 27.498°S, 50.805°W).
What is SAO ROQUE used for?
SAO ROQUE is used primarily for hydroelectric power, and is managed by ONS.