The dam Valeira is between the Town of Linhares and the municipality of Sao Joao da Pesqueira (Viseu district). It opened in 1975 and is fed by the River Douro.The Valeira is a gravity dam, 48 feet high.
Belongs to the main basin of the Douro and has a catchment area of 4388.0 km2 own.
Its reservoir has a total storage capacity of 98 540 x 103 m3 and a useful capacity of 13 040 x 103 m3, and presents an area flooded by NPA (Full Storage Level) 795 acres. The quota of water in the lake are: NPA (Full Storage Level) 105.20 meters of, NMC (Maximum flooding) of 113.00 meters and NME (Minimum Level of Operation) from 103.50 meters.
The capacity of the spillway is 18 000 m3 / s average annual flow of 15 137 hm 3.
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