SÃO SIMÃO
Goiás · PARANAIBA
Capacity
12,540 hm³
Coordinates
-19.017°N, 50.500°W
Operator
ONS
31.7% full
Current fill
31.7%vs 7 days ago
-0.5%losing
vs 1 year ago
N/A7-day trend
→stable
Drought context
Storage vs October average
87%of normal
31.7% full on 2026-10-12, against an average of 36.3% for October across 2 years of readings (-4.6 points).
Rain over the last three months · 21 September 2026
Near normal
In the three months to 21 September 2026 the area around SÃO SIMÃO had rain close to normal for the season. Rainfall compared with the long-run record for the same season at this point (Copernicus Global Drought Observatory, SPI-3 index −0.89). Rain, not storage. Brazil drought figures →
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 October 12, 2026, SÃO SIMÃO is filled to 31.7% of its total capacity, holding roughly 1,757 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 (-0.5 pts).
Across the readings we hold for SÃO SIMÃO — 52 data points between October 31, 2025 and October 12, 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
- 31.7%
- Water stored
- 1,757 hm³
- Total capacity
- 12,540 hm³
- Usable capacity
- 5,540 hm³
- 7-day change
- ▼ 0.5 pts
- Primary use
- Hydroelectric power
- River
- PARANAÍBA
- River basin
- PARANAIBA
- Operator
- ONS
- Coordinates
- 19.017°S, 50.500°W
- Last updated
- October 12, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 12 Oct 2026 | 31.7% | 1,757 |
| 9 Oct 2026 | 32.2% | 1,785 |
| 2 Oct 2026 | 32.2% | 1,785 |
| 25 Sep 2026 | 32.3% | 1,790 |
| 18 Sep 2026 | 35.5% | 1,968 |
| 11 Sep 2026 | 39.8% | 2,207 |
| 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 |