The construction of a dam to contain the waters of the Salagou was first envisaged in the ‘50s.
At the time there was an overproduction of wine. This inspired the idea of a more diversified production of a fruit growing culture. For which it was necessary to have water for irrigation.
Here in the autumn an occurring phenomenon called the « cévenol » brings with it lots of rain and often devastating floods. Even the modest river Salagou turns red and its water flows into the river Lergue and the river Hérault downstream with spectacular consequences.
It was thus decided to create the lake Salagou to regulate its swelling and as such give preference to a water reserve.
Construction work started in 1964 and finished in 1969 while preparation of the impoundment took almost three years.