San Sebastián reservoir

Ourense · Galicia

Miño - Sil basin Reservoirs in GaliciaHydroelectric

Province: Ourense
Basin: Miño - Sil
River: Bibey
Dam: Buttress · 1959

30.4%

Current level

14 hm³

Stored water

46 hm³

Total capacity

0.0 hm³

Weekly change

+2.0 hm³

Vs. 2025

-2.3 hm³

Vs. 10-year mean

Historical trend

Stored water volume · hm³

hm³

Weekly summary

The San Sebastián reservoir (embalse de San Sebastián), in the Miño - Sil basin and linked to Porto, Ourense and Galicia, is at 30.4% of its capacity, holding 14 hm³ against a maximum capacity of 46 hm³. It is currently steady in the latest update.

Compared with 2025: above (+4.3 points). Compared with the recent historical mean: below (-5.0 points).

Its main uses include water supply and hydroelectric power.

References
Reference	Level	Difference
Previous week	30.4%	0.0 pts
Same week 2025	26.1%	+4.3 pts
10-year mean	35.4%	-5.0 pts

Technical data

Characteristics of the dam and its recorded uses.

Characteristics

Municipality: Porto
River: Bibey
Dam type: Buttress
Year built: 1959
Surface area: 236 ha
Upstream: Edrada
Downstream: Pías (San Agustín)

Recorded uses

Water supply
Electricity

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

Source: MITECO Inventory of Dams and Reservoirs.

Data: MITECO · AEMET