SÃO SIMÃO
Goiás · PARANAIBA
Capacity
12,540 hm³
Coordinates
-19.017°N, 50.500°W
Operator
ONS
66.6% full
Current fill
66.6%vs 7 days ago
-2.1%losing
vs 1 year ago
+16.9%year-over-year
7-day trend
↓falling
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Technical specifications
| Total capacity | 12,540 hm³ |
| Usable capacity | 5,540 hm³ |
| Primary use | Hydroelectric |
| Operator | ONS |
| River | PARANAÍBA |
| Province | Goiás |
| River basin | PARANAIBA |
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. -19.017, -50.500 · Open in Google Maps
About SÃO SIMÃO
As of July 28, 2026, SÃO SIMÃO is filled to 66.6% of its total capacity, holding roughly 3,691 hm³ of water out of a maximum 12,540 hm³. At this level the reservoir is within its normal operating range. Of that total, about 5,540 hm³ is usable (live) storage.
Over the most recent week on record the fill level has fallen by 2.1 percentage points, and it is 16.9 points above its level on the same date a year earlier.
Across the readings we hold for SÃO SIMÃO — 52 data points between August 15, 2025 and July 28, 2026 — the level has ranged from a low of 17.9% (November 7, 2025) to a high of 97.1% (April 17, 2026). On average the reservoir is fullest around April and at its lowest around November.
It is operated by ONS primarily for hydroelectric power. It lies within the PARANAIBA basin at 19.017°S, 50.500°W.
Key facts
- Current fill level
- 66.6%
- Water stored
- 3,691 hm³
- Total capacity
- 12,540 hm³
- Usable capacity
- 5,540 hm³
- 7-day change
- ▼ 2.1 pts
- Year-on-year
- ▲ 16.9 pts
- Primary use
- Hydroelectric power
- River
- PARANAÍBA
- River basin
- PARANAIBA
- Operator
- ONS
- Coordinates
- 19.017°S, 50.500°W
- Last updated
- July 28, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 28 Jul 2026 | 66.6% | 3,691 |
| 24 Jul 2026 | 68.7% | 3,808 |
| 17 Jul 2026 | 71.7% | 3,971 |
| 10 Jul 2026 | 73.4% | 4,066 |
| 3 Jul 2026 | 75.5% | 4,183 |
| 26 Jun 2026 | 77.6% | 4,301 |
| 19 Jun 2026 | 78.1% | 4,329 |
| 12 Jun 2026 | 76.8% | 4,256 |
| 5 Jun 2026 | 76.8% | 4,256 |
| 29 May 2026 | 81.5% | 4,514 |
| 22 May 2026 | 86.0% | 4,766 |
| 15 May 2026 | 91.0% | 5,041 |
Frequently asked questions
What is the current water level of SÃO SIMÃO?
As of July 28, 2026, SÃO SIMÃO is at 66.6% of its capacity, holding approximately 3,691 hm³ of water, according to ONS – Operador Nacional do Sistema Elétrico data.
Is SÃO SIMÃO reservoir full?
No. As of July 28, 2026, SÃO SIMÃO is within its normal operating range at 66.6% of its capacity, so it is not full.
Is the water level at SÃO SIMÃO rising or falling?
The level at SÃO SIMÃO is falling — it dropped 2.1 percentage points over the latest week on record.
How much water can SÃO SIMÃO hold?
SÃO SIMÃO has a total capacity of 12,540 hm³, of which about 5,540 hm³ is usable storage.
Where is SÃO SIMÃO reservoir located?
SÃO SIMÃO is located in Goiás, Brazil, within the PARANAIBA basin (coordinates 19.017°S, 50.500°W).
What is SÃO SIMÃO used for?
SÃO SIMÃO is used primarily for hydroelectric power, and is managed by ONS.