15-471: Manicouagan Reservoir (also Lake Manicouagan / m æ n ɪ k w ɑː ɡ ən , - ɡ ɒ̃ / ) is an annular lake in central Quebec , Canada, covering an area of 1,942 km (750 sq mi). The lake island in its centre is known as René-Levasseur Island , and its highest point is Mount Babel . The structure was created 214 (±1) million years ago, in the Late Triassic , by the impact of
30-445: A 70 km (40 mi) diameter annular lake, surrounding an inner island plateau, René-Levasseur Island . It is Earth's sixth-largest confirmed impact crater according to rim-to-rim diameter. This article about geography terminology is a stub . You can help Misplaced Pages by expanding it . Jean-Lesage generating station The Jean-Lesage generating station , (French: Centrale Jean-Lesage) formerly known as Manic-2 ,
45-478: A crater originally about 100 km (62 mi) wide, although erosion and deposition of sediments have since reduced the visible diameter to about 72 km (45 mi). It is the Earth's sixth-largest confirmed impact structure according to rim-to-rim diameter. Mount Babel is interpreted as the central peak of the crater, formed by post-impact uplift . 1992 radiometric dating has estimated that impact melt within
60-469: A depression caused by the impact of a meteor. It is also known as an annular lake in cases where the water body is shaped like a ring, as many impact crater lakes are. One of the largest impact crater lakes is Lake Manicouagan in Canada; the crater is a multiple-ring structure about 100 km (60 mi) across, with its 70 km (40 mi) diameter inner ring its most prominent feature; it contains
75-577: A meteorite 5 km (3 mi) in diameter. The lake and island are clearly seen from space and are sometimes called the " eye of Quebec ". The lake has a volume of 137.9 km (33.1 cu mi). The reservoir is located in Manicouagan Regional County Municipality in the Côte-Nord region of Quebec, Canada, about 300 km (190 mi) north of the city of Baie-Comeau , although its northernmost part
90-459: Is a dam located 22 km from Baie-Comeau built on Manicouagan River in Quebec , Canada. It was constructed between 1961 and 1967. On June 22, 2010, the dam and the generating station were renamed in honour of Jean Lesage , who was premier of Quebec during the construction of the complex. Jean-Lesage is a gravity dam "hollow type" with a spillway made of concrete. The reservoir starts at
105-506: Is located in Caniapiscau Regional County Municipality . Quebec Route 389 passes the eastern shore of the lake. The crater is a multiple-ring structure about 100 km (60 mi) across, with the reservoir at its 70 km (40 mi) diameter inner ring being its most prominent feature. It surrounds an inner island plateau called René-Levasseur Island and Mount Babel is the highest peak of
120-934: The Saint Martin crater in Manitoba , the Obolon' crater in Ukraine , and the Red Wing crater in North Dakota . similar to the well observed string of impacts of Comet Shoemaker–Levy 9 on Jupiter in 1994. However, more recent work has found that the craters formed many millions of years apart, with the Saint Martin crater dating to 227.8 ± 1.1 Ma. While the Rochechouart structure formed 206.92 ± 0.20/0.32 Ma. The Manicouagan Reservoir as it presently exists
135-400: The base of Manic-3 . The dam is considered run-of-the-river and is fitted with eight Francis turbines , with a total capacity of 1,145 megawatts (1,535,000 hp). Construction started on October 24, 1961. From June 2 to December 8, 1962, diversion tunnels were driven through the mountain to divert the river's flow around the construction site. The cofferdam that forced the water to use
150-449: The diversion tunnels was completed on July 30, 1963, construction of the dam started the day after. By autumn 1965, the dam and powerhouse were sufficiently complete to put the first group of five turbines into service, the others were put in service at the end of construction. Commissioning was completed in 1967. It is possible to visit the complex during summer between the end of June and start of September. The 90-minute visit consists of
165-733: The impact structure has an age of 214 ± 1 million years. A later estimate found an age of 215.4 ± 0.16 Ma. As this is more than 12 million years before the end of the Triassic, the impact that produced the crater cannot have been the cause of the Triassic–Jurassic extinction event . It was suggested that the Manicouagan crater may have been part of a multiple impact event which also formed the Rochechouart impact structure in France,
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#1732798146106180-426: The island, at 952 m (3,123 ft) above sea level and 590 m (1,936 ft) above the reservoir level. The Louis-Babel Ecological Reserve makes up the central part of the island. Manicouagan Reservoir lies within the remnant of an ancient, deeply eroded impact crater ( Impact structure ). The crater was formed following the impact of an asteroid with a diameter of 5 km (3 mi), which excavated
195-642: The rivers involved are the Manicouagan and the Outardes . The reservoir acts as a giant headpond for the Manicouagan River, feeding the Jean-Lesage generating station (Manic-2), René-Lévesque generating station (Manic-3), and Daniel-Johnson Dam ( Manic-5 ) generating stations downstream. In the peak period of the winter cold, the lake surface is usually lower, since the turbines run all
210-530: The time at peak load to meet the huge electrical heating needs of the province. The surface of the lake also experiences low levels in the extreme periods of heat in New England during the summer, since in that period Hydro-Québec sells electrical energy to the joint New England grid and individual utilities in the United States. Impact crater lake An impact crater lake is a lake inside
225-566: Was created in the 1960s, by flooding the earlier Lake Mushalagan (Mouchalagan) to the west of the central plateau and then-smaller Manicouagan to the east, by construction of the Daniel-Johnson dam . The works were part of the enormous Manicouagan or Manic series of hydroelectric projects undertaken by Hydro-Québec , the provincial electrical utility. The complex of dams is also called the Manic-Outardes Project because
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