Casares de Arbas
León · Castile and León · Duero
Capacity
37 hm³
Coordinates
42.928°N, 5.761°W
Operator
CHD
78.4% full
Current fill
78.4%vs 7 days ago
-2.7%losing
vs 1 year ago
0.0%year-over-year
7-day trend
↓falling
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Technical specifications
| Total capacity | 37 hm³ |
| Usable capacity | 33.3 hm³ |
| Primary use | Multi-purpose |
| Operator | CHD |
| Province | León |
| Autonomous community | Castile and León |
| River basin | Duero |
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 42.928, -5.761 · Open in Google Maps
About Casares de Arbas
As of July 27, 2026, Casares de Arbas is filled to 78.4% of its total capacity, holding roughly 29 hm³ of water out of a maximum 37 hm³. At this level the reservoir is within its normal operating range. Of that total, about 33 hm³ is usable (live) storage.
Over the most recent week on record the fill level has fallen by 2.7 percentage points, and it sits close to where it was a year earlier.
Across the readings we hold for Casares de Arbas — 420 data points between July 17, 2018 and July 27, 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
- 78.4%
- Water stored
- 29 hm³
- Total capacity
- 37 hm³
- Usable capacity
- 33 hm³
- 7-day change
- ▼ 2.7 pts
- Year-on-year
- No change
- Primary use
- Multipurpose
- River basin
- Duero
- Operator
- CHD
- Coordinates
- 42.928°N, 5.761°W
- Last updated
- July 27, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 27 Jul 2026 | 78.4% | 29 |
| 20 Jul 2026 | 81.1% | 30 |
| 14 Jul 2026 | 83.8% | 31 |
| 7 Jul 2026 | 86.5% | 32 |
| 30 Jun 2026 | 89.2% | 33 |
| 23 Jun 2026 | 91.9% | 34 |
| 16 Jun 2026 | 94.6% | 35 |
| 9 Jun 2026 | 94.6% | 35 |
| 2 Jun 2026 | 94.6% | 35 |
| 26 May 2026 | 94.6% | 35 |
| 19 May 2026 | 91.9% | 34 |
| 12 May 2026 | 89.2% | 33 |
Frequently asked questions
What is the current water level of Casares de Arbas?
As of July 27, 2026, Casares de Arbas is at 78.4% of its capacity, holding approximately 29 hm³ of water, according to embalses.net data.
Is Casares de Arbas reservoir full?
No. As of July 27, 2026, Casares de Arbas is within its normal operating range at 78.4% of its capacity, so it is not full.
Is the water level at Casares de Arbas rising or falling?
The level at Casares de Arbas is falling — it dropped 2.7 percentage points over the latest week on record.
How much water can Casares de Arbas hold?
Casares de Arbas has a total capacity of 37 hm³, of which about 33 hm³ is usable storage.
Where is Casares de Arbas reservoir located?
Casares de Arbas is located in León, Castile and León, Spain, within the Duero basin (coordinates 42.928°N, 5.761°W).
What is Casares de Arbas used for?
Casares de Arbas is used primarily for multiple purposes, and is managed by CHD.