Reservoir Watch
Official fill levels across 401 Spanish reservoirs, grouped by autonomous community. Data from the MITECO national hydrological bulletin.
Average fill
73.4%
Total volume
41.1 km³
Reservoirs
401
Critical
11
Low level
22
Fill by autonomous community
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Spain at a glance
National average fill
73.4%
41,112 of 56,480 hm³ stored
Reservoirs
401
Regions
15
Total capacity
56.5 km³
Volume stored
41.1 km³
Critical
11
Low level
22
National fill — multi-year
By autonomous community
Sorted by capacityExtremadura
41 reservoirs
Average fill
75.0%
Andalusia
62 reservoirs
Average fill
78.5%
Castile and León
41 reservoirs
Average fill
75.7%
Castile-La Mancha
31 reservoirs
Average fill
64.9%
Aragon
33 reservoirs
Average fill
70.5%
Galicia
25 reservoirs
Average fill
69.9%
Valencian Community
21 reservoirs
Average fill
49.9%
Catalonia
19 reservoirs
Average fill
83.6%
Community of Madrid
12 reservoirs
Average fill
75.3%
Navarre
8 reservoirs
Average fill
65.6%
Cantabria
2 reservoirs
Average fill
77.0%
Asturias
6 reservoirs
Average fill
76.3%
Autonomous Community of the Basque Country
4 reservoirs
Average fill
76.2%
Rioja
4 reservoirs
Average fill
71.3%
Region of Murcia
7 reservoirs
Average fill
29.1%
By river basin authority
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
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 July 20, 2026, the reservoirs we track across Spain that report live levels hold roughly 41,112 hm³ of water — about 73.4% of their combined capacity. Taken together, Spain's reservoirs are within their normal operating range.
Across the region, 11 reservoirs are at critically low levels and 22 are low. San Antón is the fullest at 100.0%, while Valdeinfierno is the lowest at 0.0%.
Over the most recent week on record, 19 reservoirs rose and 143 reservoirs fell across Spain.
Storage figures for Spain come from MITECO; the most recent reading is from July 20, 2026. Each reservoir below links to its own page with full history and seasonal context.
Spain at a glance
- Reservoirs tracked
- 401
- Average fill
- 73.4%
- Water stored
- 41,112 hm³
- Combined capacity
- 56,480 hm³
- At critically low levels
- 11
- Fullest
- San Antón (100.0%)
- Lowest
- Valdeinfierno (0.0%)
- Last updated
- July 20, 2026
Frequently asked questions
How full are reservoirs in Spain right now?
As of July 20, 2026, the reservoirs tracked in Spain that report live levels are 73.4% full overall, holding about 41,112 hm³ of water.
How many reservoirs are there in Spain?
reservoirs.earth tracks 401 reservoirs in Spain, with a combined storage capacity of 56,480 hm³.
Which reservoir in Spain is the fullest?
San Antón is currently the fullest reservoir in Spain, at 100.0% of capacity.
Which reservoir in Spain is the lowest?
Valdeinfierno is currently the lowest in Spain, at 0.0% of capacity.
Where does the reservoir data for Spain come from?
All storage figures for Spain come from MITECO, an official source, last updated July 20, 2026.