It was created in the mid-1970s as part of the James Bay Project and provides the needed water for the Robert-Bourassa and La Grande-2-A generating stations.

[1] The reservoir has an estimated volume of 61.7 cubic kilometres (14.8 cu mi), of which 19.4 cubic kilometres (4.7 cu mi) is available for hydro-electric power generation.

[2] The reservoir is formed behind the Robert-Bourassa Dam that was built across a valley of the La Grande River.

[3] There are another 31 smaller dikes keeping the water inside the reservoir.

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