BOA ESPERANÇA
Piauí · PARNAIBA
Capacity
5,085 hm³
Coordinates
-6.751°N, 43.568°W
Operator
ONS
Current fill
96.3%vs 7 days ago
-0.2%losing
vs 1 year ago
0.0%year-over-year
7-day trend
→stable
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Technical specifications
| Total capacity | 5,085 hm³ |
| Usable capacity | 1,912 hm³ |
| Primary use | Hydroelectric |
| Operator | ONS |
| River | PARNAÍBA |
| Province | Piauí |
| River basin | PARNAIBA |
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. -6.751, -43.568 · Open in Google Maps
About BOA ESPERANÇA
As of June 10, 2026, BOA ESPERANÇA is filled to 96.3% of its total capacity, holding roughly 1,841 hm³ of water out of a maximum 5,085 hm³. At this level the reservoir is high. Of that total, about 1,912 hm³ is usable (live) storage.
Over the most recent week on record the fill level has held broadly steady (-0.2 pts), and it sits close to where it was a year earlier.
Across the readings we hold for BOA ESPERANÇA — 52 data points between June 27, 2025 and June 10, 2026 — the level has ranged from a low of 22.7% (December 5, 2025) to a high of 100.0% (May 1, 2026). On average the reservoir is fullest around May and at its lowest around November.
It is operated by ONS primarily for hydroelectric power. It lies within the PARNAIBA basin at 6.751°S, 43.568°W.
Key facts
- Current fill level
- 96.3%
- Water stored
- 1,841 hm³
- Total capacity
- 5,085 hm³
- Usable capacity
- 1,912 hm³
- 7-day change
- ▼ 0.2 pts
- Year-on-year
- No change
- Primary use
- Hydroelectric power
- River
- PARNAÍBA
- River basin
- PARNAIBA
- Operator
- ONS
- Coordinates
- 6.751°S, 43.568°W
- Last updated
- June 10, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 10 Jun 2026 | 96.3% | 1,841 |
| 5 Jun 2026 | 96.5% | 1,845 |
| 29 May 2026 | 96.5% | 1,845 |
| 22 May 2026 | 96.3% | 1,841 |
| 15 May 2026 | 96.5% | 1,845 |
| 8 May 2026 | 97.1% | 1,856 |
| 1 May 2026 | 100.0% | 1,912 |
| 24 Apr 2026 | 98.4% | 1,882 |
| 17 Apr 2026 | 94.5% | 1,807 |
| 10 Apr 2026 | 93.7% | 1,792 |
| 3 Apr 2026 | 90.6% | 1,732 |
| 27 Mar 2026 | 82.3% | 1,574 |
Frequently asked questions
What is the current water level of BOA ESPERANÇA?
As of June 10, 2026, BOA ESPERANÇA is at 96.3% of its capacity, holding approximately 1,841 hm³ of water, according to ONS – Operador Nacional do Sistema Elétrico data.
Is BOA ESPERANÇA reservoir full?
BOA ESPERANÇA is essentially full, sitting at 96.3% of capacity as of June 10, 2026.
Is the water level at BOA ESPERANÇA rising or falling?
The level at BOA ESPERANÇA has been broadly stable over the latest week on record (-0.2 points).
How much water can BOA ESPERANÇA hold?
BOA ESPERANÇA has a total capacity of 5,085 hm³, of which about 1,912 hm³ is usable storage.
Where is BOA ESPERANÇA reservoir located?
BOA ESPERANÇA is located in Piauí, Brazil, within the PARNAIBA basin (coordinates 6.751°S, 43.568°W).
What is BOA ESPERANÇA used for?
BOA ESPERANÇA is used primarily for hydroelectric power, and is managed by ONS.