# Spanish reservoir water reserve decline

> Live situation record from CLSTR: https://clstr.news/situations/spanish-reservoir-water-reserve-decline
> Updated: 2026-08-25T07:15:45.000Z. Sources: 15. Developments: 2.

Water reserves across Spain have shown a significant downward trend during the summer months. In late August, specific regions faced acute shortages, with the Riaño reservoir in León at 47% capacity and Barrios de Luna below 33%. Navarra also reported critical levels, with total reserves at 46.32%, marking one of the lowest levels in the country and falling below the ten-year average.

National data indicates that total Spanish reservoir reserves reached 64.9% capacity, representing a decline of 12.2 percentage points since the start of July. While some basins, such as those in Catalonia and the Basque Country, maintained levels above 70%, others faced lower availability, including the Mediterranean basin at 58.2% and the Tajo basin's Entrepeñas and Buendía reservoirs at 53.69%.

## Claims

- Spanish reservoir reserves are at 64.9% capacity, totaling 36,370 cubic hectometers. (single source)
- Spanish reservoirs have lost 12.2 percentage points since the beginning of July. (single source)
- The Monteagudo de las Vicarías reservoir is at 77.4% capacity with 7.5 cubic hectometers of water. (single source)
- The Entrepeñas and Buendía reservoirs currently hold 53.69% of their total capacity. (single source)

## Timeline

### 2026-08-25: Global water reserves show regional shifts in Spain and Chile

Water reserves in Spain have reached their highest late-August levels since 2014 at 64.9%, despite regional Mediterranean shortages. Meanwhile, heavy rains in Chile have boosted northern reservoir levels.

12 sources. https://clstr.news/cluster/spain-reservoir-reserves-drop-to-649-capacity

### 2026-08-22: Water reserves decline in León and Navarra

Water reserves in Spain are declining, with León's Riaño reservoir at 47% and Navarra facing its third-lowest water levels in the country, falling well below historical averages.

3 sources. https://clstr.news/cluster/water-reserves-decline-in-len-and-navarra

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Cite as: Spanish reservoir water reserve decline. CLSTR, https://clstr.news/situations/spanish-reservoir-water-reserve-decline