Arlanzón
Burgos · Castile and León · Duero
Capacity
22 hm³
Coordinates
42.258°N, 3.340°W
Operator
CHD
50.0% full
Current fill
50.0%vs 7 days ago
-4.5%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 | 22 hm³ |
| Usable capacity | 19.8 hm³ |
| Primary use | Multi-purpose |
| Operator | CHD |
| Province | Burgos |
| Autonomous community | Castile and León |
| River basin | Duero |
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 42.258, -3.340 · Open in Google Maps
About Arlanzón
As of September 7, 2026, Arlanzón is filled to 50.0% of its total capacity, holding roughly 11 hm³ of water out of a maximum 22 hm³. At this level the reservoir is within its normal operating range. Of that total, about 20 hm³ is usable (live) storage.
Over the most recent week on record the fill level has fallen by 4.5 percentage points, and it sits close to where it was a year earlier.
Across the readings we hold for Arlanzón — 419 data points between September 4, 2018 and September 7, 2026 — the level has ranged from a low of 40.9% (November 4, 2025) to a high of 100.0% (February 5, 2019). 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 42.258°N, 3.340°W.
Key facts
- Current fill level
- 50.0%
- Water stored
- 11 hm³
- Total capacity
- 22 hm³
- Usable capacity
- 20 hm³
- 7-day change
- ▼ 4.5 pts
- Year-on-year
- No change
- Primary use
- Multipurpose
- River basin
- Duero
- Operator
- CHD
- Coordinates
- 42.258°N, 3.340°W
- Last updated
- September 7, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 7 Sep 2026 | 50.0% | 11 |
| 1 Sep 2026 | 54.5% | 12 |
| 25 Aug 2026 | 59.1% | 13 |
| 18 Aug 2026 | 59.1% | 13 |
| 11 Aug 2026 | 63.6% | 14 |
| 4 Aug 2026 | 68.2% | 15 |
| 28 Jul 2026 | 68.2% | 15 |
| 21 Jul 2026 | 72.7% | 16 |
| 14 Jul 2026 | 72.7% | 16 |
| 7 Jul 2026 | 77.3% | 17 |
| 30 Jun 2026 | 81.8% | 18 |
| 23 Jun 2026 | 86.4% | 19 |