Reservoir Watch
Official fill levels across 401 Spanish reservoirs, grouped by autonomous community. Data from the MITECO national hydrological bulletin.
Average fill
82.4%
Total volume
46.2 km³
Reservoirs
401
Critical
10
Low level
13
Fill by autonomous community
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Spain at a glance
National average fill
82.4%
46,154 of 56,480 hm³ stored
Reservoirs
401
Regions
15
Total capacity
56.5 km³
Volume stored
46.2 km³
Critical
10
Low level
13
National fill — multi-year
By autonomous community
Sorted by capacityExtremadura
41 reservoirs
Average fill
82.7%
Andalusia
62 reservoirs
Average fill
84.5%
Castile and León
41 reservoirs
Average fill
87.9%
Castile-La Mancha
31 reservoirs
Average fill
69.6%
Aragon
33 reservoirs
Average fill
87.0%
Galicia
25 reservoirs
Average fill
81.9%
Valencian Community
21 reservoirs
Average fill
57.4%
Catalonia
19 reservoirs
Average fill
93.9%
Community of Madrid
12 reservoirs
Average fill
82.8%
Navarre
8 reservoirs
Average fill
84.3%
Cantabria
2 reservoirs
Average fill
86.1%
Asturias
6 reservoirs
Average fill
87.8%
Autonomous Community of the Basque Country
4 reservoirs
Average fill
85.3%
Rioja
4 reservoirs
Average fill
89.8%
Region of Murcia
7 reservoirs
Average fill
33.1%
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 June 9, 2026, the reservoirs we track across Spain that report live levels hold roughly 46,154 hm³ of water — about 82.4% of their combined capacity. Taken together, Spain's reservoirs are high.
Across the region, 10 reservoirs are at critically low levels and 13 are low. Alsa - Mediajo is the fullest at 100.0%, while Algar is the lowest at 0.0%.
Over the most recent week on record, 28 reservoirs rose and 89 reservoirs fell across Spain.
Storage figures for Spain come from MITECO; the most recent reading is from June 9, 2026. Each reservoir below links to its own page with full history and seasonal context.
Spain at a glance
- Reservoirs tracked
- 401
- Average fill
- 82.4%
- Water stored
- 46,154 hm³
- Combined capacity
- 56,480 hm³
- At critically low levels
- 10
- Fullest
- Alsa - Mediajo (100.0%)
- Lowest
- Algar (0.0%)
- Last updated
- June 9, 2026
Frequently asked questions
How full are reservoirs in Spain right now?
As of June 9, 2026, the reservoirs tracked in Spain that report live levels are 82.4% full overall, holding about 46,154 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?
Alsa - Mediajo is currently the fullest reservoir in Spain, at 100.0% of capacity.
Which reservoir in Spain is the lowest?
Algar 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 June 9, 2026.