P. AFONSO 4
Bahia · SAO FRANCISCO
Capacity
1,277 hm³
Coordinates
-9.416°N, 38.211°W
Operator
ONS
Current fill
65.1%vs 7 days ago
-2.9%losing
vs 1 year ago
-8.6%year-over-year
7-day trend
↓falling
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Technical specifications
| Total capacity | 1,277 hm³ |
| Usable capacity | 209 hm³ |
| Primary use | Hydroelectric |
| Operator | ONS |
| River | SÃO FRANCISCO |
| Province | Bahia |
| River basin | SAO FRANCISCO |
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. -9.416, -38.211 · Open in Google Maps
About P. AFONSO 4
As of June 10, 2026, P. AFONSO 4 is filled to 65.1% of its total capacity, holding roughly 136 hm³ of water out of a maximum 1,277 hm³. At this level the reservoir is within its normal operating range. Of that total, about 209 hm³ is usable (live) storage.
Over the most recent week on record the fill level has fallen by 2.9 percentage points, and it is 8.6 points below its level on the same date a year earlier.
Across the readings we hold for P. AFONSO 4 — 52 data points between June 27, 2025 and June 10, 2026 — the level has ranged from a low of 58.4% (October 24, 2025) to a high of 75.6% (December 19, 2025). On average the reservoir is fullest around February and at its lowest around March.
It is operated by ONS primarily for hydroelectric power. It lies within the SAO FRANCISCO basin at 9.416°S, 38.211°W.
Key facts
- Current fill level
- 65.1%
- Water stored
- 136 hm³
- Total capacity
- 1,277 hm³
- Usable capacity
- 209 hm³
- 7-day change
- ▼ 2.9 pts
- Year-on-year
- ▼ 8.6 pts
- Primary use
- Hydroelectric power
- River
- SÃO FRANCISCO
- River basin
- SAO FRANCISCO
- Operator
- ONS
- Coordinates
- 9.416°S, 38.211°W
- Last updated
- June 10, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 10 Jun 2026 | 65.1% | 136 |
| 5 Jun 2026 | 67.9% | 142 |
| 29 May 2026 | 64.1% | 134 |
| 22 May 2026 | 65.5% | 137 |
| 15 May 2026 | 66.0% | 138 |
| 8 May 2026 | 65.5% | 137 |
| 1 May 2026 | 67.5% | 141 |
| 24 Apr 2026 | 71.3% | 149 |
| 17 Apr 2026 | 63.2% | 132 |
| 10 Apr 2026 | 60.3% | 126 |
| 3 Apr 2026 | 67.0% | 140 |
| 27 Mar 2026 | 64.6% | 135 |
Frequently asked questions
What is the current water level of P. AFONSO 4?
As of June 10, 2026, P. AFONSO 4 is at 65.1% of its capacity, holding approximately 136 hm³ of water, according to ONS – Operador Nacional do Sistema Elétrico data.
Is P. AFONSO 4 reservoir full?
No. As of June 10, 2026, P. AFONSO 4 is within its normal operating range at 65.1% of its capacity, so it is not full.
Is the water level at P. AFONSO 4 rising or falling?
The level at P. AFONSO 4 is falling — it dropped 2.9 percentage points over the latest week on record.
How much water can P. AFONSO 4 hold?
P. AFONSO 4 has a total capacity of 1,277 hm³, of which about 209 hm³ is usable storage.
Where is P. AFONSO 4 reservoir located?
P. AFONSO 4 is located in Bahia, Brazil, within the SAO FRANCISCO basin (coordinates 9.416°S, 38.211°W).
What is P. AFONSO 4 used for?
P. AFONSO 4 is used primarily for hydroelectric power, and is managed by ONS.