Construction
The main dam is located 117.5 kilometers (73.0 mi) from the mouth of the river, in the transition zone between the plateau and the coastal plain, and has a maximum height of 162 meters (531 ft). Twenty-nine dykes of various sizes close the reservoir. They are organized in three group: dykes D1-D4 are located north of the spillway, nicknamed the Staircase of the Giants, D5-D14 are located on the left shore of the river while a third group, nicknamed the Duncan dykes (D17-D27), are located 30 kilometers (19 mi) south. The dam and dykes hold a reservoir covering an area of 2,835 square kilometres (1,095 sq mi) with a useful capacity of 19.365 billion m³.
The generating station itself is located underground, 6 kilometers (3.7 mi) downstream from the main dam. It hosts 16 Francis turbines, set up in two groups of eight each.
In 1974, in what was one of the most extreme cases of workplace sabotage up to that point in time, workers at the La Grande-2 site used bulldozers to topple electric generators, damaged fuel tanks, and set buildings on fire. The project was delayed a year, and the direct cost of the damage estimated at $2 million CAD. The causes were not clear, however three factors have been cited: inter-union rivalry, poor working conditions, and the perceived arrogance of American executives at the contractor, Bechtel Corporation.
Read more about this topic: Robert-Bourassa Generating Station
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