TUCURUI
Pará · TOCANTINS
Capacity
50,275 hm³
Coordinates
-3.834°N, 49.645°W
Operator
ONS
73.0% full
Current fill
73.0%vs 7 days ago
-1.2%losing
vs 1 year ago
N/A7-day trend
→stable
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 September 9, 2026, TUCURUI is filled to 73.0% of its total capacity, holding roughly 28,461 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 held broadly steady (-1.2 pts).
Across the readings we hold for TUCURUI — 52 data points between September 26, 2025 and September 9, 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
- 73.0%
- Water stored
- 28,461 hm³
- Total capacity
- 50,275 hm³
- Usable capacity
- 38,982 hm³
- 7-day change
- ▼ 1.2 pts
- Primary use
- Hydroelectric power
- River
- TOCANTINS
- River basin
- TOCANTINS
- Operator
- ONS
- Coordinates
- 3.834°S, 49.645°W
- Last updated
- September 9, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 9 Sep 2026 | 73.0% | 28,461 |
| 4 Sep 2026 | 74.2% | 28,913 |
| 28 Aug 2026 | 76.8% | 29,931 |
| 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 |
| 24 Jul 2026 | 86.2% | 33,618 |
| 17 Jul 2026 | 87.6% | 34,145 |
| 10 Jul 2026 | 89.4% | 34,835 |
| 3 Jul 2026 | 90.7% | 35,373 |
| 26 Jun 2026 | 92.4% | 36,020 |