ESTREITO
Tocantins · TOCANTINS
Capacity
5,298.54 hm³
Coordinates
-6.589°N, 47.464°W
Operator
ONS
87.3% full
Current fill
87.3%vs 7 days ago
-0.4%losing
vs 1 year ago
-1.9%year-over-year
7-day trend
→stable
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Technical specifications
| Total capacity | 5,298.54 hm³ |
| Usable capacity | 2,390.87 hm³ |
| Primary use | Hydroelectric |
| Operator | ONS |
| River | TOCANTINS |
| Province | Tocantins |
| River basin | TOCANTINS |
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. -6.589, -47.464 · Open in Google Maps
About ESTREITO
As of July 28, 2026, ESTREITO is filled to 87.3% of its total capacity, holding roughly 2,088 hm³ of water out of a maximum 5,299 hm³. At this level the reservoir is high. Of that total, about 2,391 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 1.9 points below its level on the same date a year earlier.
Across the readings we hold for ESTREITO — 52 data points between August 15, 2025 and July 28, 2026 — the level has ranged from a low of 42.6% (February 6, 2026) to a high of 93.9% (November 14, 2025). On average the reservoir is fullest around November and at its lowest around January.
It is operated by ONS primarily for hydroelectric power. It lies within the TOCANTINS basin at 6.589°S, 47.464°W.
Key facts
- Current fill level
- 87.3%
- Water stored
- 2,088 hm³
- Total capacity
- 5,299 hm³
- Usable capacity
- 2,391 hm³
- 7-day change
- ▼ 0.4 pts
- Year-on-year
- ▼ 1.9 pts
- Primary use
- Hydroelectric power
- River
- TOCANTINS
- River basin
- TOCANTINS
- Operator
- ONS
- Coordinates
- 6.589°S, 47.464°W
- Last updated
- July 28, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 28 Jul 2026 | 87.3% | 2,088 |
| 24 Jul 2026 | 87.7% | 2,098 |
| 17 Jul 2026 | 86.9% | 2,077 |
| 10 Jul 2026 | 85.4% | 2,042 |
| 3 Jul 2026 | 87.5% | 2,093 |
| 26 Jun 2026 | 87.7% | 2,098 |
| 19 Jun 2026 | 87.1% | 2,082 |
| 12 Jun 2026 | 83.5% | 1,997 |
| 5 Jun 2026 | 90.1% | 2,154 |
| 29 May 2026 | 90.8% | 2,170 |
| 22 May 2026 | 91.2% | 2,181 |
| 15 May 2026 | 89.7% | 2,144 |
Frequently asked questions
What is the current water level of ESTREITO?
As of July 28, 2026, ESTREITO is at 87.3% of its capacity, holding approximately 2,088 hm³ of water, according to ONS – Operador Nacional do Sistema Elétrico data.
Is ESTREITO reservoir full?
No. As of July 28, 2026, ESTREITO is high at 87.3% of its capacity, so it is not full.
Is the water level at ESTREITO rising or falling?
The level at ESTREITO has been broadly stable over the latest week on record (-0.4 points).
How much water can ESTREITO hold?
ESTREITO has a total capacity of 5,299 hm³, of which about 2,391 hm³ is usable storage.
Where is ESTREITO reservoir located?
ESTREITO is located in Tocantins, Brazil, within the TOCANTINS basin (coordinates 6.589°S, 47.464°W).
What is ESTREITO used for?
ESTREITO is used primarily for hydroelectric power, and is managed by ONS.