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Spanish reservoir water reserve decline

Updated 4 times since CLSTR started tracking revisions of this situation.

What changed

2026-09-23 07:02 UTC → 2026-10-06 06:29 UTC · added removed

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. As the summer season concluded in mid-September, declines resurfaced. In León, the combined capacity of major reservoirs fell to 36.3%. In Jaén, the provincial average fell to 68.73% from 75.13% in early August. By late September, a continued lack of precipitation has further impacted levels. In Soria, the Monteagudo de las Vicarías reservoir sits at 74.9% capacity, which is below last year’s levels. In the Duero basin, the La Cuerda del Pozo reservoir has dropped to 53.19% capacity, a significant decrease from the 64.93% recorded in September 2025, attributed to a total absence of rainfall over a seven-day period. In Navarra, reserves have dropped to 30.32% capacity as of the fourth week of September, representing a 46 percentage point decrease from 76% in late June. The Yesa reservoir has fallen below 20% capacity. Total regional reserves By the start of 309 cubic hectometers remain below both last year’s October, reservoir levels in León declined further to 33.8% capacity. Data from the Confederación Hidrográfica del Duero indicates that the Esla and Órbigo systems hold approximately 435.5 hectometres out of a 1,288.4 hectometre capacity. Individual levels include Porma at 38.5%, Riaño at 37.4%, Barrios de Luna at 23.5%, and Villameca at 11.1%. This decline follows the ten-year average. summer months and the irrigation season.

Versions

  1. 2026-10-06 06:29 UTC Spanish reservoir water reserve decline
  2. 2026-09-23 07:02 UTC Spanish reservoir water reserve decline
  3. 2026-09-22 11:25 UTC Spanish reservoir water reserve decline
  4. 2026-09-16 22:46 UTC Spanish reservoir water reserve decline
  5. 2026-08-25 13:47 UTC Spanish reservoir water reserve decline

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