SERRA DA MESA
Goiás · TOCANTINS
Capacity
54,400 hm³
Coordinates
-13.834°N, 48.306°W
Operator
ONS
51.4% full
Current fill
51.4%vs 7 days ago
-0.7%losing
vs 1 year ago
N/A7-day trend
→stable
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Technical specifications
| Total capacity | 54,400 hm³ |
| Usable capacity | 43,250 hm³ |
| Primary use | Hydroelectric |
| Operator | ONS |
| River | TOCANTINS |
| Province | Goiás |
| River basin | TOCANTINS |
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. -13.834, -48.306 · Open in Google Maps
About SERRA DA MESA
As of September 9, 2026, SERRA DA MESA is filled to 51.4% of its total capacity, holding roughly 22,226 hm³ of water out of a maximum 54,400 hm³. At this level the reservoir is within its normal operating range. Of that total, about 43,250 hm³ is usable (live) storage.
Over the most recent week on record the fill level has held broadly steady (-0.7 pts).
Across the readings we hold for SERRA DA MESA — 52 data points between September 26, 2025 and September 9, 2026 — the level has ranged from a low of 51.4% (September 9, 2026) to a high of 63.2% (April 24, 2026). On average the reservoir is fullest around April and at its lowest around September.
It is operated by ONS primarily for hydroelectric power. It lies within the TOCANTINS basin at 13.834°S, 48.306°W.
Key facts
- Current fill level
- 51.4%
- Water stored
- 22,226 hm³
- Total capacity
- 54,400 hm³
- Usable capacity
- 43,250 hm³
- 7-day change
- ▼ 0.7 pts
- Primary use
- Hydroelectric power
- River
- TOCANTINS
- River basin
- TOCANTINS
- Operator
- ONS
- Coordinates
- 13.834°S, 48.306°W
- Last updated
- September 9, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 9 Sep 2026 | 51.4% | 22,226 |
| 4 Sep 2026 | 52.1% | 22,551 |
| 28 Aug 2026 | 53.3% | 23,070 |
| 21 Aug 2026 | 54.5% | 23,554 |
| 14 Aug 2026 | 55.3% | 23,913 |
| 7 Aug 2026 | 56.0% | 24,237 |
| 31 Jul 2026 | 56.8% | 24,553 |
| 24 Jul 2026 | 57.5% | 24,864 |
| 17 Jul 2026 | 58.2% | 25,180 |
| 10 Jul 2026 | 58.9% | 25,483 |
| 3 Jul 2026 | 59.6% | 25,781 |
| 26 Jun 2026 | 60.3% | 26,080 |