TUCURUI
Pará · TOCANTINS
Capacity
50,275 hm³
Coordinates
-3.834°N, 49.645°W
Operator
ONS
85.9% full
Current fill
85.9%vs 7 days ago
-0.5%losing
vs 1 year ago
+1.4%year-over-year
7-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 July 28, 2026, TUCURUI is filled to 85.9% of its total capacity, holding roughly 33,482 hm³ of water out of a maximum 50,275 hm³. At this level the reservoir is high. 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 (-0.5 pts), and it is 1.4 points above its level on the same date a year earlier.
Across the readings we hold for TUCURUI — 52 data points between August 15, 2025 and July 28, 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
- 85.9%
- Water stored
- 33,482 hm³
- Total capacity
- 50,275 hm³
- Usable capacity
- 38,982 hm³
- 7-day change
- ▼ 0.5 pts
- Year-on-year
- ▲ 1.4 pts
- Primary use
- Hydroelectric power
- River
- TOCANTINS
- River basin
- TOCANTINS
- Operator
- ONS
- Coordinates
- 3.834°S, 49.645°W
- Last updated
- July 28, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 28 Jul 2026 | 85.9% | 33,482 |
| 24 Jul 2026 | 86.4% | 33,696 |
| 17 Jul 2026 | 87.6% | 34,160 |
| 10 Jul 2026 | 89.4% | 34,835 |
| 3 Jul 2026 | 90.7% | 35,373 |
| 26 Jun 2026 | 92.4% | 36,020 |
| 19 Jun 2026 | 94.4% | 36,799 |
| 12 Jun 2026 | 97.3% | 37,910 |
| 5 Jun 2026 | 97.6% | 38,035 |
| 29 May 2026 | 96.7% | 37,704 |
| 22 May 2026 | 98.1% | 38,234 |
| 15 May 2026 | 97.3% | 37,942 |
Frequently asked questions
What is the current water level of TUCURUI?
As of July 28, 2026, TUCURUI is at 85.9% of its capacity, holding approximately 33,482 hm³ of water, according to ONS – Operador Nacional do Sistema Elétrico data.
Is TUCURUI reservoir full?
No. As of July 28, 2026, TUCURUI is high at 85.9% of its capacity, so it is not full.
Is the water level at TUCURUI rising or falling?
The level at TUCURUI has been broadly stable over the latest week on record (-0.5 points).
How much water can TUCURUI hold?
TUCURUI has a total capacity of 50,275 hm³, of which about 38,982 hm³ is usable storage.
Where is TUCURUI reservoir located?
TUCURUI is located in Pará, Brazil, within the TOCANTINS basin (coordinates 3.834°S, 49.645°W).
What is TUCURUI used for?
TUCURUI is used primarily for hydroelectric power, and is managed by ONS.