SANTA BRANCA
São Paulo · PARAIBA DO SUL
Useful capacity
307.27 hm³
Coordinates
23.374°S, 45.870°W
Operator
ONS
47.7% of useful capacity
Current fill
47.7%of useful capacity
vs 7 days ago
+2.9 ppgaining
vs 1 year ago
+19.5 ppyear-over-year
7-day trend
↑rising
Drought context
Storage vs October average
132%of normal
47.7% full on 2026-10-26, against an average of 36.1% for October across 2 years of readings (+11.6 points).
Rain over the last three months · 11 October 2026
Extremely wet
In the three months to 11 October 2026 the area around SANTA BRANCA had exceptionally wet conditions, a surplus seen about one year in forty. Rainfall compared with the long-run record for the same season at this point (Copernicus Global Drought Observatory, SPI-3 index +2.29). Rain, not storage. Brazil drought figures →
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Technical specifications
| Total capacity | 439 hm³ |
| Usable capacity | 307.27 hm³ |
| Primary use | Hydroelectric |
| Operator | ONS |
| River | PARAÍBA SUL |
| Province | São Paulo |
| River basin | PARAIBA DO SUL |
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 23.374°S, 45.870°W · Open in Google Maps
About SANTA BRANCA
As of October 26, 2026, SANTA BRANCA is at 47.7% of useful capacity, holding 146.5 hm³ of 307.27 hm³. Of the 439 hm³ total capacity, that is 33.4%. At this level the reservoir is within its normal operating range.
Over the most recent week on record the fill level has risen by 2.9 percentage points, and it is 19.5 points above its level on the same date a year earlier.
Across the readings we hold for SANTA BRANCA — 65 data points between October 26, 2025 and October 26, 2026 — the level has ranged from a low of 20.8% (November 21, 2025) to a high of 47.7% (May 1, 2026). On average the reservoir is fullest around February and at its lowest around November.
It is operated by ONS primarily for hydroelectric power. It lies within the PARAIBA DO SUL basin at 23.374°S, 45.870°W.
Key facts
- Current fill level
- 47.7% of useful capacity
- Water stored
- 146.5 hm³
- Total capacity
- 439 hm³
- Usable capacity
- 307.27 hm³
- 7-day change
- ▲ 2.9 pp
- Year-on-year
- ▲ 19.5 pp
- Primary use
- Hydroelectric power
- River
- PARAÍBA SUL
- River basin
- PARAIBA DO SUL
- Operator
- ONS
- Coordinates
- 23.374°S, 45.870°W
- Last updated
- October 26, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 26 Oct 2026 | 47.7% | 146.5 |
| 25 Oct 2026 | 46.7% | 143.5 |
| 24 Oct 2026 | 45.1% | 138.5 |
| 23 Oct 2026 | 44.9% | 137.9 |
| 22 Oct 2026 | 44.8% | 137.7 |
| 21 Oct 2026 | 44.8% | 137.7 |
| 20 Oct 2026 | 44.8% | 137.7 |
| 19 Oct 2026 | 44.8% | 137.7 |
| 18 Oct 2026 | 44.8% | 137.7 |
| 17 Oct 2026 | 44.7% | 137.2 |
| 16 Oct 2026 | 43.5% | 133.8 |
| 15 Oct 2026 | 42.2% | 129.7 |