SÃO SIMÃO
Goiás · PARANAIBA
Useful capacity
5,540 hm³
Coordinates
19.017°S, 50.500°W
Operator
ONS
34.7% of useful capacity
Current fill
34.7%of useful capacity
vs 7 days ago
-0.1 pplosing
vs 1 year ago
+12.7 ppyear-over-year
7-day trend
→stable
Drought context
Storage vs October average
125%of normal
34.7% full on 2026-10-26, against an average of 27.7% for October across 2 years of readings (+7.0 points).
Rain over the last three months · 11 October 2026
Near normal
In the three months to 11 October 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 +0.26). 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°S, 50.500°W · Open in Google Maps
About SÃO SIMÃO
As of October 26, 2026, SÃO SIMÃO is at 34.7% of useful capacity, holding 1,922 hm³ of 5,540 hm³. Of the 12,540 hm³ total capacity, that is 15.3%. At this level the reservoir is low.
Over the most recent week on record the fill level has held broadly steady (-0.1 pp), and it is 12.7 points above its level on the same date a year earlier.
Across the readings we hold for SÃO SIMÃO — 65 data points between October 26, 2025 and October 26, 2026 — the level has ranged from a low of 18.1% (November 21, 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
- 34.7% of useful capacity
- Water stored
- 1,922 hm³
- Total capacity
- 12,540 hm³
- Usable capacity
- 5,540 hm³
- 7-day change
- ▼ 0.1 pp
- Year-on-year
- ▲ 12.7 pp
- Primary use
- Hydroelectric power
- River
- PARANAÍBA
- River basin
- PARANAIBA
- Operator
- ONS
- Coordinates
- 19.017°S, 50.500°W
- Last updated
- October 26, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 26 Oct 2026 | 34.7% | 1,922 |
| 25 Oct 2026 | 34.4% | 1,906 |
| 24 Oct 2026 | 34.4% | 1,906 |
| 23 Oct 2026 | 34.1% | 1,891 |
| 22 Oct 2026 | 34.5% | 1,911 |
| 21 Oct 2026 | 34.4% | 1,906 |
| 20 Oct 2026 | 34.9% | 1,932 |
| 19 Oct 2026 | 34.8% | 1,927 |
| 18 Oct 2026 | 34.0% | 1,881 |
| 17 Oct 2026 | 33.6% | 1,860 |
| 16 Oct 2026 | 32.7% | 1,813 |
| 15 Oct 2026 | 31.2% | 1,729 |