SERRA DA MESA
Goiás · TOCANTINS
Capacity
54,400 hm³
Coordinates
-13.834°N, 48.306°W
Operator
ONS
57.1% full
Current fill
57.1%vs 7 days ago
-0.4%losing
vs 1 year ago
-8.3%year-over-year
7-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 July 28, 2026, SERRA DA MESA is filled to 57.1% of its total capacity, holding roughly 24,687 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 (-0.4 pts), and it is 8.3 points below its level on the same date a year earlier.
Across the readings we hold for SERRA DA MESA — 52 data points between August 15, 2025 and July 28, 2026 — the level has ranged from a low of 55.3% (January 2, 2026) to a high of 65.4% (August 15, 2025). On average the reservoir is fullest around August and at its lowest around December.
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
- 57.1%
- Water stored
- 24,687 hm³
- Total capacity
- 54,400 hm³
- Usable capacity
- 43,250 hm³
- 7-day change
- ▼ 0.4 pts
- Year-on-year
- ▼ 8.3 pts
- Primary use
- Hydroelectric power
- River
- TOCANTINS
- River basin
- TOCANTINS
- Operator
- ONS
- Coordinates
- 13.834°S, 48.306°W
- Last updated
- July 28, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 28 Jul 2026 | 57.1% | 24,687 |
| 24 Jul 2026 | 57.5% | 24,856 |
| 17 Jul 2026 | 58.2% | 25,172 |
| 10 Jul 2026 | 58.9% | 25,483 |
| 3 Jul 2026 | 59.6% | 25,781 |
| 26 Jun 2026 | 60.3% | 26,080 |
| 19 Jun 2026 | 61.0% | 26,361 |
| 12 Jun 2026 | 61.6% | 26,629 |
| 5 Jun 2026 | 62.0% | 26,811 |
| 29 May 2026 | 62.3% | 26,949 |
| 22 May 2026 | 62.5% | 27,018 |
| 15 May 2026 | 62.8% | 27,148 |
Frequently asked questions
What is the current water level of SERRA DA MESA?
As of July 28, 2026, SERRA DA MESA is at 57.1% of its capacity, holding approximately 24,687 hm³ of water, according to ONS – Operador Nacional do Sistema Elétrico data.
Is SERRA DA MESA reservoir full?
No. As of July 28, 2026, SERRA DA MESA is within its normal operating range at 57.1% of its capacity, so it is not full.
Is the water level at SERRA DA MESA rising or falling?
The level at SERRA DA MESA has been broadly stable over the latest week on record (-0.4 points).
How much water can SERRA DA MESA hold?
SERRA DA MESA has a total capacity of 54,400 hm³, of which about 43,250 hm³ is usable storage.
Where is SERRA DA MESA reservoir located?
SERRA DA MESA is located in Goiás, Brazil, within the TOCANTINS basin (coordinates 13.834°S, 48.306°W).
What is SERRA DA MESA used for?
SERRA DA MESA is used primarily for hydroelectric power, and is managed by ONS.