Alsa - Mediajo
Cantábrico Occidental
Capacity
22 hm³
Coordinates
0.000°N, 0.000°E
Operator
Cantábrico Occidental
86.4% full
Current fill
86.4%vs 7 days ago
0.0%stable
vs 1 year ago
0.0%year-over-year
7-day trend
→stable
Technical specifications
| Total capacity | 22 hm³ |
| Usable capacity | 22 hm³ |
| Primary use | — |
| Operator | Cantábrico Occidental |
| River basin | Cantábrico Occidental |
About Alsa - Mediajo
As of September 7, 2026, Alsa - Mediajo is filled to 86.4% of its total capacity, holding roughly 19 hm³ of water out of a maximum 22 hm³. At this level the reservoir is high.
Over the most recent week on record the fill level has held broadly steady (+0.0 pts), and it sits close to where it was a year earlier.
Across the readings we hold for Alsa - Mediajo — 419 data points between September 4, 2018 and September 7, 2026 — the level has ranged from a low of 63.6% (November 8, 2022) to a high of 104.5% (March 31, 2026). On average the reservoir is fullest around May and at its lowest around November.
It is operated by Cantábrico Occidental. It lies within the Cantábrico Occidental basin at 0.000°N, 0.000°E.
Key facts
- Current fill level
- 86.4%
- Water stored
- 19 hm³
- Total capacity
- 22 hm³
- 7-day change
- No change
- Year-on-year
- No change
- River basin
- Cantábrico Occidental
- Operator
- Cantábrico Occidental
- Coordinates
- 0.000°N, 0.000°E
- Last updated
- September 7, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 7 Sep 2026 | 86.4% | 19 |
| 1 Sep 2026 | 86.4% | 19 |
| 25 Aug 2026 | 90.9% | 20 |
| 18 Aug 2026 | 86.4% | 19 |
| 11 Aug 2026 | 86.4% | 19 |
| 4 Aug 2026 | 90.9% | 20 |
| 28 Jul 2026 | 90.9% | 20 |
| 21 Jul 2026 | 90.9% | 20 |
| 14 Jul 2026 | 95.5% | 21 |
| 7 Jul 2026 | 100.0% | 22 |
| 30 Jun 2026 | 100.0% | 22 |
| 23 Jun 2026 | 100.0% | 22 |