Spain15 regions · official MITECO data

Reservoir Watch

Official fill levels across 401 Spanish reservoirs, grouped by autonomous community. Data from the MITECO national hydrological bulletin.

Average fill

62.6%

Total volume

35.1 km³

Reservoirs

401

Critical

Low level

Fill by autonomous community

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Status:Critical (<20%)Low (20–40%)Normal / High (>40%)

Spain at a glance

National average fill

62.6%

35,075 of 56,480 hm³ stored

Reservoirs

401

Regions

Total capacity

56.5 km³

Volume stored

35.1 km³

Critical

Low level

National fill — multi-year

By autonomous community

Sorted by capacity

Extremadura

41 reservoirs

4 low

Average fill

66.9%

9,644 hm³ storedView →

Andalusia

62 reservoirs

3 critical

Average fill

71.4%

7,523 hm³ storedView →

Castile and León

41 reservoirs

3 critical

Average fill

58.5%

4,426 hm³ storedView →

Castile-La Mancha

31 reservoirs

2 critical

Average fill

58.9%

3,000 hm³ storedView →

Aragon

33 reservoirs

4 critical

Average fill

49.8%

2,245 hm³ storedView →

Galicia

25 reservoirs

5 low

Average fill

57.6%

1,528 hm³ storedView →

Valencian Community

21 reservoirs

5 critical

Average fill

40.8%

795 hm³ storedView →

Catalonia

19 reservoirs

1 critical

Average fill

69.8%

1,328 hm³ storedView →

Community of Madrid

12 reservoirs

2 low

Average fill

65.5%

667 hm³ storedView →

Navarre

8 reservoirs

2 low

Average fill

43.4%

248 hm³ storedView →

Cantabria

2 reservoirs

1 critical

Average fill

60.2%

333 hm³ storedView →

Asturias

6 reservoirs

1 low

Average fill

64.4%

291 hm³ storedView →

Autonomous Community of the Basque Country

4 reservoirs

Average fill

66.2%

153 hm³ storedView →

Rioja

4 reservoirs

1 critical

Average fill

43.9%

69 hm³ storedView →

Region of Murcia

7 reservoirs

3 critical

Average fill

25.0%

37 hm³ storedView →

By river basin authority

Cantábrico Occidental Cantábrico Oriental Cuenca Mediterránea Andaluza Cuencas Internas de Cataluña Cuencas Internas del País Vasco Duero Ebro Galicia Costa Guadalete-Barbate Guadalquivir Guadiana Júcar Miño - Sil Segura Tajo Tinto, Odiel y Piedras

All reservoirs

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Communities shown as N/A

the Balearic Islands, the Canary Islands, Ceuta and Melilla appear as N/A on the map. Our data comes from MITECO's national reservoir bulletin, which tracks the peninsular river-basin authorities (Confederaciones Hidrográficas). The island communities rely largely on desalination and groundwater rather than the large surface reservoirs reported in that bulletin, and Ceuta and Melilla have no significant reservoirs — so none have a tracked fill level.

Dataset coverage

88%of national storage capacity has public data

Tracked

401

reservoirs

With data

401

reservoirs

Tracked capacity

56,480

hm³

Source: MITECO — Ministerio para la Transición Ecológica y el Reto Demográfico (Spain)

Covers all reservoirs in the MITECO national hydrological bulletin. This represents essentially complete coverage of Spain's publicly monitored reservoir infrastructure.

About reservoirs in Spain

As of September 7, 2026, the reservoirs we track across Spain that report live levels hold roughly 35,075 hm³ of water — about 62.6% of their combined capacity. Taken together, Spain's reservoirs are within their normal operating range.

Across the region, 26 reservoirs are at critically low levels and 47 are low. Rábanos is the fullest at 100.0%, while Valdeinfierno is the lowest at 0.0%.

Over the most recent week on record, 18 reservoirs rose and 125 reservoirs fell across Spain.

Storage figures for Spain come from MITECO; the most recent reading is from September 7, 2026. Each reservoir below links to its own page with full history and seasonal context.

Spain at a glance

Reservoirs tracked: 401
Average fill: 62.6%
Water stored: 35,075 hm³
Combined capacity: 56,480 hm³
At critically low levels: 26
Fullest: Rábanos (100.0%)
Lowest: Valdeinfierno (0.0%)
Last updated: September 7, 2026