TUCURUI
Pará · TOCANTINS
Capacity
50,275 hm³
Coordinates
-3.834°N, 49.645°W
Operator
ONS
65.0% full
Current fill
65.0%vs 7 days ago
-2.1%losing
vs 1 year ago
N/A7-day trend
↓falling
Drought context
Storage vs October average
103%of normal
65.0% full on 2026-10-12, against an average of 63.2% for October across 2 years of readings (+1.8 points).
Rain over the last three months · 21 September 2026
Moderately dry
In the three months to 21 September 2026 the area around TUCURUI had well below normal rain, a shortfall seen about one year in six. Rainfall compared with the long-run record for the same season at this point (Copernicus Global Drought Observatory, SPI-3 index −1.22). Rain, not storage. Brazil drought figures →
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Technical specifications
| Total capacity | 50,275 hm³ |
| Usable capacity | 38,982.4 hm³ |
| Primary use | Hydroelectric |
| Operator | ONS |
| River | TOCANTINS |
| Province | Pará |
| River basin | TOCANTINS |
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. -3.834, -49.645 · Open in Google Maps
About TUCURUI
As of October 12, 2026, TUCURUI is filled to 65.0% of its total capacity, holding roughly 25,346 hm³ of water out of a maximum 50,275 hm³. At this level the reservoir is within its normal operating range. Of that total, about 38,982 hm³ is usable (live) storage.
Over the most recent week on record the fill level has fallen by 2.1 percentage points.
Across the readings we hold for TUCURUI — 52 data points between October 31, 2025 and October 12, 2026 — the level has ranged from a low of 28.2% (December 26, 2025) to a high of 99.7% (April 24, 2026). On average the reservoir is fullest around May and at its lowest around December.
It is operated by ONS primarily for hydroelectric power. It lies within the TOCANTINS basin at 3.834°S, 49.645°W.
Key facts
- Current fill level
- 65.0%
- Water stored
- 25,346 hm³
- Total capacity
- 50,275 hm³
- Usable capacity
- 38,982 hm³
- 7-day change
- ▼ 2.1 pts
- Primary use
- Hydroelectric power
- River
- TOCANTINS
- River basin
- TOCANTINS
- Operator
- ONS
- Coordinates
- 3.834°S, 49.645°W
- Last updated
- October 12, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 12 Oct 2026 | 65.0% | 25,346 |
| 9 Oct 2026 | 65.4% | 25,495 |
| 2 Oct 2026 | 67.2% | 26,177 |
| 25 Sep 2026 | 69.2% | 26,991 |
| 18 Sep 2026 | 71.0% | 27,674 |
| 11 Sep 2026 | 72.3% | 28,192 |
| 4 Sep 2026 | 74.1% | 28,898 |
| 28 Aug 2026 | 76.8% | 29,927 |
| 21 Aug 2026 | 79.2% | 30,859 |
| 14 Aug 2026 | 80.9% | 31,541 |
| 7 Aug 2026 | 83.5% | 32,554 |
| 31 Jul 2026 | 85.0% | 33,143 |