Alsa - Mediajo reservoir

Cantabria · Cantabria

Cantábrico Occidental basin Reservoirs in CantabriaHydroelectric

Province: Cantabria
Basin: Cantábrico Occidental
River: Torina
Dam: Gravity · 1921

86.4%

Current level

19 hm³

Stored water

22 hm³

Total capacity

0.0 hm³

Weekly change

+1.0 hm³

Vs. 2025

+0.7 hm³

Vs. 10-year mean

Historical trend

Stored water volume · hm³

hm³

Weekly summary

The Alsa - Mediajo reservoir (embalse de Alsa - Mediajo), in the Cantábrico Occidental basin and linked to San Miguel de Aguayo, Cantabria and Cantabria, is at 86.4% of its capacity, holding 19 hm³ against a maximum capacity of 22 hm³. It is currently steady in the latest update.

Compared with 2025: above (+4.5 points). Compared with the recent historical mean: above (+6.8 points).

Its main uses include hydroelectric power.

References
Reference	Level	Difference
Previous week	86.4%	0.0 pts
Same week 2025	81.8%	+4.5 pts
10-year mean	79.6%	+6.8 pts

Technical data

Characteristics of the dam and its recorded uses.

Characteristics

Municipality: San Miguel de Aguayo
River: Torina
Dam type: Gravity
Year built: 1921
Surface area: 183.47 ha
Upstream: — no data
Downstream: No

Recorded uses

Electricity

Not recorded: water supply, irrigation, industrial, fishing, boating, swimming, picnic, restaurants.

Source: MITECO Inventory of Dams and Reservoirs.

Data: MITECO · AEMET