San Sebastián
Zamora · Castile and León · Miño - Sil
Capacity
46 hm³
Coordinates
42.151°N, 6.925°W
Operator
CHS
43.5% full
Current fill
43.5%vs 7 days ago
-4.3%losing
vs 1 year ago
+17.4%year-over-year
7-day trend
↓falling
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Technical specifications
| Total capacity | 46 hm³ |
| Usable capacity | 41.4 hm³ |
| Primary use | Multi-purpose |
| Operator | CHS |
| Province | Zamora |
| Autonomous community | Castile and León |
| River basin | Miño - Sil |
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 42.151, -6.925 · Open in Google Maps
About San Sebastián
As of September 7, 2026, San Sebastián is filled to 43.5% of its total capacity, holding roughly 20 hm³ of water out of a maximum 46 hm³. At this level the reservoir is within its normal operating range. Of that total, about 41 hm³ is usable (live) storage.
Over the most recent week on record the fill level has fallen by 4.3 percentage points, and it is 17.4 points above its level on the same date a year earlier.
Across the readings we hold for San Sebastián — 419 data points between September 4, 2018 and September 7, 2026 — the level has ranged from a low of 21.7% (November 24, 2020) to a high of 89.1% (January 3, 2023). On average the reservoir is fullest around May and at its lowest around October.
It is operated by CHS primarily for multiple purposes. It lies within the Miño - Sil basin at 42.151°N, 6.925°W.
Key facts
- Current fill level
- 43.5%
- Water stored
- 20 hm³
- Total capacity
- 46 hm³
- Usable capacity
- 41 hm³
- 7-day change
- ▼ 4.3 pts
- Year-on-year
- ▲ 17.4 pts
- Primary use
- Multipurpose
- River basin
- Miño - Sil
- Operator
- CHS
- Coordinates
- 42.151°N, 6.925°W
- Last updated
- September 7, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 7 Sep 2026 | 43.5% | 20 |
| 1 Sep 2026 | 47.8% | 22 |
| 25 Aug 2026 | 47.8% | 22 |
| 18 Aug 2026 | 47.8% | 22 |
| 11 Aug 2026 | 47.8% | 22 |
| 4 Aug 2026 | 47.8% | 22 |
| 28 Jul 2026 | 50.0% | 23 |
| 21 Jul 2026 | 50.0% | 23 |
| 14 Jul 2026 | 50.0% | 23 |
| 7 Jul 2026 | 52.2% | 24 |
| 30 Jun 2026 | 54.3% | 25 |
| 23 Jun 2026 | 60.9% | 28 |