Eiras reservoir

Pontevedra · Galicia

Galicia Costa basin Reservoirs in Galicia

Province: Pontevedra
Basin: Galicia Costa
River: Oitavén
Dam: Arch · 1977

40.9%

Current level

9 hm³

Stored water

22 hm³

Total capacity

-1.0 hm³

Weekly change

-2.0 hm³

Vs. 2025

-6.1 hm³

Vs. 10-year mean

Historical trend

Stored water volume · hm³

hm³

Weekly summary

The Eiras reservoir (embalse de Eiras), in the Galicia Costa basin and linked to Fornelos de Montes, Pontevedra and Galicia, is at 40.9% of its capacity, holding 9 hm³ against a maximum capacity of 22 hm³. It is currently falling, by 1.0 hm³ this week.

Compared with 2025: below (-9.1 points). Compared with the recent historical mean: below (-27.7 points).

Its main uses include water supply and irrigation.

References
Reference	Level	Difference
Previous week	45.5%	-4.5 pts
Same week 2025	50.0%	-9.1 pts
10-year mean	68.6%	-27.7 pts

Technical data

Characteristics of the dam and its recorded uses.

Characteristics

Municipality: Fornelos de Montes
River: Oitavén
Dam type: Arch
Year built: 1977
Surface area: 149 ha
Upstream: — no data
Downstream: No

Recorded uses

Water supply
Irrigation
Industrial
Fishing
Boating

Not recorded: electricity, swimming, picnic, restaurants.

Source: MITECO Inventory of Dams and Reservoirs.

Data: MITECO · AEMET