Casares de Arbas
León · Castile and León · Duero
Capacity
37 hm³
Coordinates
42.928°N, 5.761°W
Operator
CHD
37.8% full
Current fill
37.8%vs 13 Oct 2026
-2.7 pplosing
vs 1 year ago
+2.7 ppyear-over-year
Trend
↓falling
Drought context
Storage vs October average
110%of normal
37.8% full on 2026-10-19, against an average of 34.3% for October across 9 years of readings (+3.5 points).
Rain over the last three months · 11 October 2026
Near normal
In the three months to 11 October 2026 the area around Casares de Arbas had rain close to normal for the season. Rainfall compared with the long-run record for the same season at this point (Copernicus Global Drought Observatory, SPI-3 index −0.72). Rain, not storage.
EU drought indicator · 11 October 2026
Warningsoil-moisture deficit
The European Drought Observatory's combined reading of rain, soil moisture and vegetation at this point. Watch means rain has been short, Warning that the soil has dried out, Alert that vegetation is visibly stressed; Recovery means the shortfall is easing. Ground conditions, not the reservoir's storage. Spain drought figures →
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Technical specifications
| Total capacity | 37 hm³ |
| Primary use | Multi-purpose |
| Operator | CHD |
| Province | León |
| Region | Castile and León |
| River basin | Duero |
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 42.928°N, 5.761°W · Open in Google Maps
About Casares de Arbas
As of October 19, 2026, Casares de Arbas is filled to 37.8% of its total capacity, holding 14 hm³ of water out of a maximum 37 hm³. At this level the reservoir is low.
Since October 13, 2026 the fill level has fallen by 2.7 percentage points, and it is 2.7 points above its level on the same date a year earlier.
Across the readings we hold for Casares de Arbas — 419 data points between October 16, 2018 and October 19, 2026 — the level has ranged from a low of 24.3% (October 18, 2022) to a high of 97.3% (March 31, 2020). On average the reservoir is fullest around May and at its lowest around November.
It is operated by CHD primarily for multiple purposes. It lies within the Duero basin at 42.928°N, 5.761°W.
Key facts
- Current fill level
- 37.8% of total capacity
- Water stored
- 14 hm³
- Total capacity
- 37 hm³
- Change since October 13, 2026
- ▼ 2.7 pp
- Year-on-year
- ▲ 2.7 pp
- Primary use
- Multipurpose
- River basin
- Duero
- Operator
- CHD
- Coordinates
- 42.928°N, 5.761°W
- Last updated
- October 19, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 19 Oct 2026 | 37.8% | 14 |
| 13 Oct 2026 | 40.5% | 15 |
| 6 Oct 2026 | 45.9% | 17 |
| 29 Sep 2026 | 45.9% | 17 |
| 22 Sep 2026 | 45.9% | 17 |
| 15 Sep 2026 | 54.1% | 20 |
| 8 Sep 2026 | 56.8% | 21 |
| 1 Sep 2026 | 59.5% | 22 |
| 25 Aug 2026 | 62.2% | 23 |
| 18 Aug 2026 | 70.3% | 26 |
| 11 Aug 2026 | 70.3% | 26 |
| 4 Aug 2026 | 78.4% | 29 |