Alloz
Estellerria · Navarre · Ebro
Capacity
66 hm³
Coordinates
42.724°N, 1.942°W
Operator
CHE
31.8% full
Current fill
31.8%vs 7 days ago
-3.0%losing
vs 1 year ago
-15.2%year-over-year
7-day trend
↓falling
Drought context
Storage vs October average
121%of normal
31.8% full on 2026-10-06, against an average of 26.3% for October across 9 years of readings (+5.5 points).
Rain over the last three months · 21 September 2026
Severely dry
In the three months to 21 September 2026 the area around Alloz had far less rain than normal, a shortfall seen about one year in fifteen. Rainfall compared with the long-run record for the same season at this point (Copernicus Global Drought Observatory, SPI-3 index −1.75). Rain, not storage.
EU drought indicator · 11 September 2026
Watchrainfall 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 | 66 hm³ |
| Usable capacity | 59.4 hm³ |
| Primary use | Multi-purpose |
| Operator | CHE |
| Province | Estellerria |
| Autonomous community | Navarre |
| River basin | Ebro |
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 42.724, -1.942 · Open in Google Maps
About Alloz
As of October 6, 2026, Alloz is filled to 31.8% of its total capacity, holding roughly 21 hm³ of water out of a maximum 66 hm³. At this level the reservoir is low. Of that total, about 59 hm³ is usable (live) storage.
Over the most recent week on record the fill level has fallen by 3.0 percentage points, and it is 15.2 points below its level on the same date a year earlier.
Across the readings we hold for Alloz — 418 data points between October 9, 2018 and October 6, 2026 — the level has ranged from a low of 16.7% (November 2, 2021) to a high of 93.9% (May 20, 2025). On average the reservoir is fullest around June and at its lowest around November.
It is operated by CHE primarily for multiple purposes. It lies within the Ebro basin at 42.724°N, 1.942°W.
Key facts
- Current fill level
- 31.8%
- Water stored
- 21 hm³
- Total capacity
- 66 hm³
- Usable capacity
- 59 hm³
- 7-day change
- ▼ 3.0 pts
- Year-on-year
- ▼ 15.2 pts
- Primary use
- Multipurpose
- River basin
- Ebro
- Operator
- CHE
- Coordinates
- 42.724°N, 1.942°W
- Last updated
- October 6, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 6 Oct 2026 | 31.8% | 21 |
| 29 Sep 2026 | 34.8% | 23 |
| 22 Sep 2026 | 37.9% | 25 |
| 15 Sep 2026 | 43.9% | 29 |
| 8 Sep 2026 | 50.0% | 33 |
| 1 Sep 2026 | 56.1% | 37 |
| 25 Aug 2026 | 60.6% | 40 |
| 18 Aug 2026 | 66.7% | 44 |
| 11 Aug 2026 | 71.2% | 47 |
| 4 Aug 2026 | 75.8% | 50 |
| 28 Jul 2026 | 77.3% | 51 |
| 21 Jul 2026 | 77.3% | 51 |