SÃO SIMÃO
Goiás · PARANAIBA
Capacity
12,540 hm³
Coordinates
-19.017°N, 50.500°W
Operator
ONS
39.7% full
Current fill
39.7%vs 7 days ago
-1.0%losing
vs 1 year ago
N/A7-day trend
→stable
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 September 9, 2026, SÃO SIMÃO is filled to 39.7% of its total capacity, holding roughly 2,201 hm³ of water out of a maximum 12,540 hm³. At this level the reservoir is low. Of that total, about 5,540 hm³ is usable (live) storage.
Over the most recent week on record the fill level has held broadly steady (-1.0 pts).
Across the readings we hold for SÃO SIMÃO — 52 data points between September 26, 2025 and September 9, 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
- 39.7%
- Water stored
- 2,201 hm³
- Total capacity
- 12,540 hm³
- Usable capacity
- 5,540 hm³
- 7-day change
- ▼ 1.0 pts
- Primary use
- Hydroelectric power
- River
- PARANAÍBA
- River basin
- PARANAIBA
- Operator
- ONS
- Coordinates
- 19.017°S, 50.500°W
- Last updated
- September 9, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 9 Sep 2026 | 39.7% | 2,201 |
| 4 Sep 2026 | 40.7% | 2,257 |
| 28 Aug 2026 | 48.7% | 2,700 |
| 21 Aug 2026 | 56.4% | 3,125 |
| 14 Aug 2026 | 63.0% | 3,489 |
| 7 Aug 2026 | 63.3% | 3,506 |
| 31 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 |