The Grandval Dam (French: barrage de Grandval, French pronunciation: ​[baʁaʒ də ɡʁɑ̃val]) is a dam in the French region Massif central, which opened in 1960. It was conceived by architects Henri et Louis Marty. It is located on the Truyère river, in the departement of Cantal, in between the communes of Fridefont et de Lavastrie.

Grandval Dam
Official name	Barrage de Grandval
Country	France
Location	Lavastrie
Coordinates	44°55′20.5″N 3°04′28.8″E
Construction began	1955
Opening date	1960
Dam and spillways
Height (foundation)	88m
Height (thalweg)	76m
Length	376m
Dam volume	271m3

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[de] Talsperre Grandval