P. AFONSO 4
Bahia · SAO FRANCISCO
Capacity
1,277 hm³
Coordinates
-9.416°N, 38.211°W
Operator
ONS
66.0% full
Current fill
66.0%vs 7 days ago
+6.2%gaining
vs 1 year ago
N/A7-day trend
↑rising
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 September 12, 2026, P. AFONSO 4 is filled to 66.0% of its total capacity, holding roughly 138 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 risen by 6.2 percentage points.
Across the readings we hold for P. AFONSO 4 — 52 data points between October 3, 2025 and September 12, 2026 — the level has ranged from a low of 53.1% (August 28, 2026) to a high of 75.6% (December 19, 2025). On average the reservoir is fullest around February and at its lowest around August.
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
- 66.0%
- Water stored
- 138 hm³
- Total capacity
- 1,277 hm³
- Usable capacity
- 209 hm³
- 7-day change
- ▲ 6.2 pts
- Primary use
- Hydroelectric power
- River
- SÃO FRANCISCO
- River basin
- SAO FRANCISCO
- Operator
- ONS
- Coordinates
- 9.416°S, 38.211°W
- Last updated
- September 12, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 12 Sep 2026 | 66.0% | 138 |
| 11 Sep 2026 | 64.6% | 135 |
| 4 Sep 2026 | 59.8% | 125 |
| 28 Aug 2026 | 53.1% | 111 |
| 21 Aug 2026 | 56.9% | 119 |
| 14 Aug 2026 | 56.0% | 117 |
| 7 Aug 2026 | 67.9% | 142 |
| 31 Jul 2026 | 68.4% | 143 |
| 24 Jul 2026 | 55.0% | 115 |
| 17 Jul 2026 | 67.5% | 141 |
| 10 Jul 2026 | 57.9% | 121 |
| 3 Jul 2026 | 61.7% | 129 |