Autonomous Community · Spain
Unknown
82.7% average fill
Reservoirs
85
Volume stored
3,545 hm³
Total capacity
4,722 hm³
Critical
2
Low level
1
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Reservoirs
Alsa - Mediajo
Cantábrico Occidental
Fill level
100.0%
22 hm³
/ 22 cap.
Rioseco
Cantábrico Occidental
Fill level
75.0%
3 hm³
/ 4 cap.
Somiedo (Lagos)
Cantábrico Occidental
Fill level
N/A
6 hm³ cap.
Concepción
Cuenca Mediterránea Andaluza
Fill level
83.9%
52 hm³
/ 62 cap.
Limonero
Cuenca Mediterránea Andaluza
Fill level
72.7%
16 hm³
/ 22 cap.
Catllar
Cuencas Internas de Cataluña
Fill level
N/A
59 hm³ cap.
Foix
Cuencas Internas de Cataluña
Fill level
N/A
4 hm³ cap.
Ibai-Eder
Cuencas Internas del País Vasco
Fill level
90.9%
10 hm³
/ 11 cap.
Urkulu
Cuencas Internas del País Vasco
Fill level
100.0%
10 hm³
/ 10 cap.
Agavanzal, Nª Sª de
Duero
Fill level
94.4%
34 hm³
/ 36 cap.
Aguilar
Duero
Fill level
86.6%
214 hm³
/ 247 cap.
Pontón Alto, El
Duero
Fill level
100.0%
7 hm³
/ 7 cap.
Porma-(Juan Benet)
Duero
Fill level
89.0%
283 hm³
/ 318 cap.
Rábanos
Duero
Fill level
100.0%
8 hm³
/ 8 cap.
Alcañiz (Estanca)
Ebro
Fill level
85.7%
6 hm³
/ 7 cap.
Bachimaña (Lago)
Ebro
Fill level
N/A
7 hm³ cap.
Bramatuero Alto
Ebro
Fill level
N/A
5 hm³ cap.
Cañón de Santolea
Ebro
Fill level
65.9%
54 hm³
/ 82 cap.
Caspe
Ebro
Fill level
75.6%
62 hm³
/ 82 cap.
Certescáns
Ebro
Fill level
87.5%
14 hm³
/ 16 cap.
Escarra
Ebro
Fill level
N/A
5 hm³ cap.
González Lacasa
Ebro
Fill level
90.9%
30 hm³
/ 33 cap.
Ip
Ebro
Fill level
60.0%
3 hm³
/ 5 cap.
Las Fitas
Ebro
Fill level
88.9%
8 hm³
/ 9 cap.
Loteta (La)
Ebro
Fill level
51.0%
53 hm³
/ 104 cap.
Mar (Lago)
Ebro
Fill level
N/A
14 hm³ cap.
Negro (Lago)
Ebro
Fill level
N/A
6 hm³ cap.
Parras (Las)
Ebro
Fill level
60.0%
3 hm³
/ 5 cap.
Puente de Santolea
Ebro
Fill level
83.3%
15 hm³
/ 18 cap.
Respomuso
Ebro
Fill level
N/A
18 hm³ cap.
Saburo (Lago)
Ebro
Fill level
N/A
11 hm³ cap.
San Lorenzo
Ebro
Fill level
90.0%
9 hm³
/ 10 cap.
Santa María de Belsué
Ebro
Fill level
7.1%
1 hm³
/ 14 cap.
Sistema Valle de Arán
Ebro
Fill level
13.6%
3 hm³
/ 22 cap.
Sotonera
Ebro
Fill level
92.6%
175 hm³
/ 189 cap.
Tort (Lago)
Ebro
Fill level
N/A
7 hm³ cap.
Forcadas, As
Galicia Costa
Fill level
81.8%
9 hm³
/ 11 cap.
Ribeira, A
Galicia Costa
Fill level
63.6%
21 hm³
/ 33 cap.
Sta Uxia
Galicia Costa
Fill level
94.4%
17 hm³
/ 18 cap.
Arcos de la Frontera
Guadalete-Barbate
Fill level
100.0%
14 hm³
/ 14 cap.
Guadalcacín II
Guadalete-Barbate
Fill level
91.9%
735 hm³
/ 800 cap.
Zahara-El Gastor
Guadalete-Barbate
Fill level
72.2%
161 hm³
/ 223 cap.
Agrio (Aznalcollar)
Guadalquivir
Fill level
90.0%
18 hm³
/ 20 cap.
Alcalá del Río
Guadalquivir
Fill level
N/A
20 hm³ cap.
Bermejales
Guadalquivir
Fill level
85.7%
78 hm³
/ 91 cap.
Breña, La
Guadalquivir
Fill level
N/A
100 hm³ cap.
Cantillana
Guadalquivir
Fill level
N/A
14 hm³ cap.
Carpio, El
Guadalquivir
Fill level
N/A
18 hm³ cap.
Cordobilla
Guadalquivir
Fill level
N/A
33 hm³ cap.
Derivación Retortillo
Guadalquivir
Fill level
N/A
4 hm³ cap.
Doña Aldonza
Guadalquivir
Fill level
N/A
23 hm³ cap.
Encinarejo
Guadalquivir
Fill level
N/A
15 hm³ cap.
Fresneda
Guadalquivir
Fill level
94.7%
18 hm³
/ 19 cap.
Guillena
Guadalquivir
Fill level
N/A
5 hm³ cap.
Hornachuelos
Guadalquivir
Fill level
N/A
12 hm³ cap.
Malpasillo ( Jauja )
Guadalquivir
Fill level
N/A
6 hm³ cap.
Marmolejo
Guadalquivir
Fill level
N/A
10 hm³ cap.
Pedro Marín
Guadalquivir
Fill level
N/A
19 hm³ cap.
Villafranca
Guadalquivir
Fill level
N/A
6 hm³ cap.
Zocueca
Guadalquivir
Fill level
N/A
5 hm³ cap.
Canchales
Guadiana
Fill level
73.1%
19 hm³
/ 26 cap.
Castilseras
Guadiana
Fill level
N/A
5 hm³ cap.
Cornalbo
Guadiana
Fill level
66.7%
2 hm³
/ 3 cap.
Pto. Vallehermoso
Guadiana
Fill level
100.0%
7 hm³
/ 7 cap.
Torre de Abrahán
Guadiana
Fill level
96.2%
176 hm³
/ 183 cap.
Vega del Jabalón
Guadiana
Fill level
44.1%
15 hm³
/ 34 cap.
Regajo
Júcar
Fill level
83.3%
5 hm³
/ 6 cap.
Chandrexa
Miño - Sil
Fill level
86.9%
53 hm³
/ 61 cap.
Edrada-Mao
Miño - Sil
Fill level
57.1%
8 hm³
/ 14 cap.
Peares, Os
Miño - Sil
Fill level
97.3%
177 hm³
/ 182 cap.
San Martiño
Miño - Sil
Fill level
90.0%
9 hm³
/ 10 cap.
San. Estevo
Miño - Sil
Fill level
84.5%
180 hm³
/ 213 cap.
Cenajo
Segura
Fill level
63.4%
277 hm³
/ 437 cap.
Talave
Segura
Fill level
57.1%
20 hm³
/ 35 cap.
Aceña
Tajo
Fill level
87.5%
21 hm³
/ 24 cap.
Burguillo - Puente Nuevo
Tajo
Fill level
87.6%
176 hm³
/ 201 cap.
Torcón
Tajo
Fill level
42.9%
3 hm³
/ 7 cap.
Vellón,El-(Pedrezuela)
Tajo
Fill level
90.2%
37 hm³
/ 41 cap.
Corumbel Bajo
Tinto, Odiel y Piedras
Fill level
89.5%
17 hm³
/ 19 cap.
Jarrama
Tinto, Odiel y Piedras
Fill level
81.4%
35 hm³
/ 43 cap.
Los Machos
Tinto, Odiel y Piedras
Fill level
33.3%
4 hm³
/ 12 cap.
Odiel
Tinto, Odiel y Piedras
Fill level
87.5%
7 hm³
/ 8 cap.
Olivargas
Tinto, Odiel y Piedras
Fill level
96.6%
28 hm³
/ 29 cap.
Piedras
Tinto, Odiel y Piedras
Fill level
91.7%
55 hm³
/ 60 cap.
Sancho
Tinto, Odiel y Piedras
Fill level
82.8%
48 hm³
/ 58 cap.
About reservoirs in Unknown
As of June 9, 2026, the reservoirs we track across Unknown that report live levels hold roughly 3,545 hm³ of water — about 82.7% of their combined capacity. Taken together, Unknown's reservoirs are high.
Across the region, 2 reservoirs are at critically low levels and 1 is low. Alsa - Mediajo is the fullest at 100.0%, while Santa María de Belsué is the lowest at 7.1%.
Over the most recent week on record, 3 reservoirs rose and 16 reservoirs fell across Unknown.
Storage figures for Unknown 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.
Unknown at a glance
- Reservoirs tracked
- 85
- Average fill
- 82.7%
- Water stored
- 3,545 hm³
- Combined capacity
- 4,722 hm³
- At critically low levels
- 2
- Fullest
- Alsa - Mediajo (100.0%)
- Lowest
- Santa María de Belsué (7.1%)
- Last updated
- June 9, 2026
Frequently asked questions
How full are reservoirs in Unknown right now?
As of June 9, 2026, the reservoirs tracked in Unknown that report live levels are 82.7% full overall, holding about 3,545 hm³ of water.
How many reservoirs are there in Unknown?
reservoirs.earth tracks 85 reservoirs in Unknown, with a combined storage capacity of 4,722 hm³.
Which reservoir in Unknown is the fullest?
Alsa - Mediajo is currently the fullest reservoir in Unknown, at 100.0% of capacity.
Which reservoir in Unknown is the lowest?
Santa María de Belsué is currently the lowest in Unknown, at 7.1% of capacity.
Where does the reservoir data for Unknown come from?
All storage figures for Unknown come from MITECO, an official source, last updated June 9, 2026.