Cernadilla
Zamora · Castile and León · Duero
Capacity
255 hm³
Coordinates
42.008°N, 6.506°W
Operator
CHD
27.8% full
Current fill
27.8%vs 7 days ago
-3.6%losing
vs 1 year ago
-13.0%year-over-year
7-day trend
↓falling
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Technical specifications
| Total capacity | 255 hm³ |
| Usable capacity | 229.5 hm³ |
| Primary use | Multi-purpose |
| Operator | CHD |
| Province | Zamora |
| Autonomous community | Castile and León |
| River basin | Duero |
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 42.008, -6.506 · Open in Google Maps
About Cernadilla
As of September 7, 2026, Cernadilla is filled to 27.8% of its total capacity, holding roughly 71 hm³ of water out of a maximum 255 hm³. At this level the reservoir is low. Of that total, about 230 hm³ is usable (live) storage.
Over the most recent week on record the fill level has fallen by 3.6 percentage points, and it is 13.0 points below its level on the same date a year earlier.
Across the readings we hold for Cernadilla — 419 data points between September 4, 2018 and September 7, 2026 — the level has ranged from a low of 9.8% (August 30, 2022) to a high of 93.7% (May 14, 2024). On average the reservoir is fullest around May and at its lowest around October.
It is operated by CHD primarily for multiple purposes. It lies within the Duero basin at 42.008°N, 6.506°W.
Key facts
- Current fill level
- 27.8%
- Water stored
- 71 hm³
- Total capacity
- 255 hm³
- Usable capacity
- 230 hm³
- 7-day change
- ▼ 3.6 pts
- Year-on-year
- ▼ 13.0 pts
- Primary use
- Multipurpose
- River basin
- Duero
- Operator
- CHD
- Coordinates
- 42.008°N, 6.506°W
- Last updated
- September 7, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 7 Sep 2026 | 27.8% | 71 |
| 1 Sep 2026 | 31.4% | 80 |
| 25 Aug 2026 | 33.7% | 86 |
| 18 Aug 2026 | 36.5% | 93 |
| 11 Aug 2026 | 40.4% | 103 |
| 4 Aug 2026 | 43.5% | 111 |
| 28 Jul 2026 | 48.2% | 123 |
| 21 Jul 2026 | 52.2% | 133 |
| 14 Jul 2026 | 56.9% | 145 |
| 7 Jul 2026 | 61.2% | 156 |
| 30 Jun 2026 | 64.3% | 164 |
| 23 Jun 2026 | 68.2% | 174 |