Santillana
Community of Madrid · Tajo
Capacity
91 hm³
Coordinates
40.725°N, 3.831°W
Operator
CHT
62.6% full
Current fill
62.6%vs 7 days ago
-2.2%losing
vs 1 year ago
-13.2%year-over-year
7-day trend
↓falling
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Technical specifications
| Total capacity | 91 hm³ |
| Usable capacity | 81.9 hm³ |
| Primary use | Multi-purpose |
| Operator | CHT |
| Autonomous community | Community of Madrid |
| River basin | Tajo |
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 40.725, -3.831 · Open in Google Maps
About Santillana
As of September 7, 2026, Santillana is filled to 62.6% of its total capacity, holding roughly 57 hm³ of water out of a maximum 91 hm³. At this level the reservoir is within its normal operating range. Of that total, about 82 hm³ is usable (live) storage.
Over the most recent week on record the fill level has fallen by 2.2 percentage points, and it is 13.2 points below its level on the same date a year earlier.
Across the readings we hold for Santillana — 419 data points between September 4, 2018 and September 7, 2026 — the level has ranged from a low of 31.9% (November 12, 2019) to a high of 100.0% (March 25, 2025). On average the reservoir is fullest around April and at its lowest around October.
It is operated by CHT primarily for multiple purposes. It lies within the Tajo basin at 40.725°N, 3.831°W.
Key facts
- Current fill level
- 62.6%
- Water stored
- 57 hm³
- Total capacity
- 91 hm³
- Usable capacity
- 82 hm³
- 7-day change
- ▼ 2.2 pts
- Year-on-year
- ▼ 13.2 pts
- Primary use
- Multipurpose
- River basin
- Tajo
- Operator
- CHT
- Coordinates
- 40.725°N, 3.831°W
- Last updated
- September 7, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 7 Sep 2026 | 62.6% | 57 |
| 1 Sep 2026 | 64.8% | 59 |
| 25 Aug 2026 | 65.9% | 60 |
| 18 Aug 2026 | 68.1% | 62 |
| 11 Aug 2026 | 70.3% | 64 |
| 4 Aug 2026 | 71.4% | 65 |
| 28 Jul 2026 | 73.6% | 67 |
| 21 Jul 2026 | 75.8% | 69 |
| 14 Jul 2026 | 81.3% | 74 |
| 7 Jul 2026 | 81.3% | 74 |
| 30 Jun 2026 | 82.4% | 75 |
| 23 Jun 2026 | 84.6% | 77 |