Arlanzón
Burgos · Castile and León · Duero
Capacity
22 hm³
Coordinates
42.258°N, 3.340°W
Operator
CHD
36.4% full
Current fill
36.4%vs 13 Oct 2026
0.0 ppstable
vs 1 year ago
-9.1 ppyear-over-year
Trend
→stable
Drought context
Storage vs October average
72%of normal
36.4% full on 2026-10-19, against an average of 50.6% for October across 9 years of readings (-14.2 points).
Rain over the last three months · 11 October 2026
Near normal
In the three months to 11 October 2026 the area around Arlanzón 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 −0.42). Rain, not storage.
EU drought indicator · 11 October 2026
Recoverydeficit easing
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 | 22 hm³ |
| Primary use | Multi-purpose |
| Operator | CHD |
| Province | Burgos |
| Region | Castile and León |
| River basin | Duero |
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 42.258°N, 3.340°W · Open in Google Maps
About Arlanzón
As of October 19, 2026, Arlanzón is filled to 36.4% of its total capacity, holding 8 hm³ of water out of a maximum 22 hm³. At this level the reservoir is low.
Since October 13, 2026 the fill level has held broadly steady (+0.0 pp), and it is 9.1 points below its level on the same date a year earlier.
Across the readings we hold for Arlanzón — 419 data points between October 16, 2018 and October 19, 2026 — the level has ranged from a low of 36.4% (October 13, 2026) 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
- 36.4% of total capacity
- Water stored
- 8 hm³
- Total capacity
- 22 hm³
- Change since October 13, 2026
- No change
- Year-on-year
- ▼ 9.1 pp
- Primary use
- Multipurpose
- River basin
- Duero
- Operator
- CHD
- Coordinates
- 42.258°N, 3.340°W
- Last updated
- October 19, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 19 Oct 2026 | 36.4% | 8 |
| 13 Oct 2026 | 36.4% | 8 |
| 6 Oct 2026 | 40.9% | 9 |
| 29 Sep 2026 | 40.9% | 9 |
| 22 Sep 2026 | 45.5% | 10 |
| 15 Sep 2026 | 50.0% | 11 |
| 8 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 |