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All about hydroelectric developments 
There are close to 6,000 retaining structures of various sizes in Québec. The Ministère de l'environnement (Environment Department) owns most of them; Hydro-Québec owns and operates only one out of 10 such structures. Other dam owners, including municipalities, outfitters and companies like Alcan, are also involved in dam and dike operation, in addition to water management of the related reservoirs.
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Dike QA-8 along La Grande 4 reservoir is Hydro-Québec's largest dike, over 2 kilometres long and 92 metres high. |
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East Angus dam, belonging to Brompton Pulp and Paper (July 1950) |
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Depending on the availability of material. |
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The storage capacity of the rockfill dam at Robert-Bourassa reservoir–61.7 billion cubic metres–ranks 11th in the world. Rising 171 metres in the air, the rockfill dam at Sainte-Marguerite-3 is the highest dam of its kind in Québec.
Till: A core advantage
Till is the loose sediment deposited by glaciers, and it's the perfect material for making a dam watertight. It forms the core of most rockfill dams owned by Hydro-Québec, including some of the retaining structures in the La Grande complex. |
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Daniel-Johnson dam: A feat of engineering
This multiple-arch-and-buttress dam is the largest of its kind in the world. Inaugurated in 1969, it was named after Québec's Premier at the time, Daniel Johnson. Its reservoir is four times the size of the Island of Montréal. Its construction, spread over a 10-year period, required 2.2 million cubic metres of concrete, the equivalent of a regular sidewalk linking the North and South Poles. In 2000, Canada Post issued a stamp in honor of this structure. The reservoir serves to supply water to Manic-5 and Manic-5-PA power stations. |
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