ESTREITO
Tocantins · TOCANTINS
Useful capacity
2,390.87 hm³
Coordinates
6.589°S, 47.464°W
Operator
ONS
85.6% of useful capacity
Current fill
85.6%of useful capacity
vs 7 days ago
-3.2 pplosing
vs 1 year ago
-6.7 ppyear-over-year
7-day trend
↓falling
Drought context
Storage vs October average
94%of normal
85.6% full on 2026-10-26, against an average of 90.7% for October across 2 years of readings (-5.1 points).
Rain over the last three months · 11 October 2026
Severely dry
In the three months to 11 October 2026 the area around ESTREITO had far less rain than normal, a shortfall seen about one year in fifteen. Rainfall compared with the long-run record for the same season at this point (Copernicus Global Drought Observatory, SPI-3 index −1.78). Rain, not storage. Brazil drought figures →
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Technical specifications
| Total capacity | 5,299 hm³ |
| Usable capacity | 2,391 hm³ |
| Primary use | Hydroelectric |
| Operator | ONS |
| Province | Tocantins |
| River basin | TOCANTINS |
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 6.589°S, 47.464°W · Open in Google Maps
About ESTREITO
As of October 26, 2026, ESTREITO is at 85.6% of useful capacity, holding 2,047 hm³ of 2,391 hm³. Of the 5,299 hm³ total capacity, that is 38.6%. At this level the reservoir is high.
Over the most recent week on record the fill level has fallen by 3.2 percentage points, and it is 6.7 points below its level on the same date a year earlier.
Across the readings we hold for ESTREITO — 65 data points between October 26, 2025 and October 26, 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
- 85.6% of useful capacity
- Water stored
- 2,047 hm³
- Total capacity
- 5,299 hm³
- Usable capacity
- 2,391 hm³
- 7-day change
- ▼ 3.2 pp
- Year-on-year
- ▼ 6.7 pp
- Primary use
- Hydroelectric power
- River basin
- TOCANTINS
- Operator
- ONS
- Coordinates
- 6.589°S, 47.464°W
- Last updated
- October 26, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 26 Oct 2026 | 85.6% | 2,047 |
| 25 Oct 2026 | 89.2% | 2,134 |
| 24 Oct 2026 | 91.6% | 2,191 |
| 23 Oct 2026 | 91.4% | 2,186 |
| 22 Oct 2026 | 91.9% | 2,196 |
| 21 Oct 2026 | 91.0% | 2,175 |
| 20 Oct 2026 | 90.3% | 2,160 |
| 19 Oct 2026 | 88.8% | 2,123 |
| 18 Oct 2026 | 86.9% | 2,077 |
| 17 Oct 2026 | 85.6% | 2,047 |
| 16 Oct 2026 | 85.6% | 2,047 |
| 15 Oct 2026 | 86.9% | 2,077 |