The Sainte-Marguerite River (French: Rivière Sainte-Marguerite; Saint Margaret River) is a 316 kilometres (196 mi) long river in the Côte-Nord region of Quebec, Canada. It flows into the Gulf of Saint Lawrence to the west of Sept-Îles. There are traces of human activity along the river from 4,000 years ago. Pulp and paper exploitation in the river basin began in the early 20th century, followed by mining. The river has a large hydroelectric power dam, the Denis-Perron dam, that contains a reservoir that is 140 kilometres (87 mi) long.

Quick Facts Native name, Location ...

Sainte-Marguerite River
Sainte-Marguerite river, upstream of Sainte-Marguerite 2 Dam
Native name	Rivière Sainte-Marguerite (French)
Location
Country	Canada
Province	Quebec
Region	Côte-Nord
Physical characteristics
Mouth
• coordinates	50.14278°N 66.59666°W / 50.14278; -66.59666
Length	316 kilometres (196 mi)
Basin size	6,190 square kilometres (2,390 sq mi)
Basin features
Tributaries
• left	Jean-Pierre EGTQL Kausseshkau EJWHK Dumais EJBKD
• right	Montagne Blanche EHHOR Tabac EIFQZ Cacaouii EFSGL Coulée EIPAN Petite Coulée EFZXR Charles EFWCY Ferrée EGITD Valin EIKAP Valin Ouest EIKAR
Bridges
MNR Id	EJGWT

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The Sainte-Marguerite River is in the middle Côte-Nord, between Baie-Comeau and Havre-Saint-Pierre.^[1] The catchment area is 6,190 square kilometres (2,390 sq mi).^[2] It lies between the basins of the Dominique River to the west and the Rapides River to the east.^[3] The river originates in the northeast of the canton of Hind.^[2] It rises to the northeast of the Petit lac Manicouagan.^[4] From near the border with Labrador, the river flows first through a mountainous region, and then for more than 200 kilometres (120 mi) through a coastal plain.^[1] It is 316 kilometres (196 mi) long.^[2] Much of the southern part of the river basin, up to the Réservoir Sainte-Marguerite 3, is part of the Zec Matimek.^[5]

The hamlet of Barrage-Sainte-Marguerite is about 10 kilometres (6.2 mi) north of the river mouth. It grew up around the hydroelectric plant built in 1908 by the Clarke brothers on the site of the Amont Falls. Highway 138 crosses the dam.^[2]

The Sainte-Marguerite River enters the Gulf of Saint Lawrence about 30 kilometres (19 mi) by road west of Sept-Îles.^[1] Its mouth is to the southwest of the Baie des Sept-Îles.^[4] During the Holocene the Sainte-Marguerite created a delta of thick paraglacial and post-glacial sediments that completely cover the glacial landforms and glaciomarine deposits near the river mouth.^[6]

The river mouth today is a haven for small boats during bad weather in the Gulf, because the basin that it forms is protected by the Pointe Sainte-Marguerite. However, the channel of the river through the basin varies from year to year. The village of Rivière-Sainte-Marguerite-en-Bas is on the west bank of the mouth.^[2]

The name was used as early as 1603, when Samuel de Champlain wrote, "we came to anchor near a river called Saincte Marguerite". There is another large river with this name in Quebec, the Sainte-Marguerite River (Saguenay), an 80 kilometres (50 mi) tributary of the Saguenay River. Other names include Tshimanipishtuk River and Tshishe-Manipishtuk.^[2]

A map of the Ecological regions of Quebec shows the river rising and flowing south through the eastern spruce/moss domain of the boreal zone. The last section of the river flows through the fir/white birch domain of the boreal zone.^[7]

A project to build a third Hydro-Québec dam on the river about 80 kilometres (50 mi) from its mouth led to a project to make an inventory of archaeological sites and to excavate several sites. The project was managed in 1991–1998 by Cérane (Centre d’étude et de recherche en archéologie du Nord-Est). 67 sites were found, of which 12 were explored and one was studied intensively.^[1]

The Grand Portage section is less than 100 kilometres (62 mi) from the river's mouth. Over a stretch of 11 kilometres (6.8 mi) this section has a series of waterfalls and impassible rapids. The portage to bypass these obstacles could take a week. There are indications that people have used the portage for 4,000 years.^[1] There seem to have been different groups of people in the Sainte-Marguerite valley, separated by the Grand Portage. The people to the south were associated with the world of the Saint Lawrence coast, while those to the north were more associated with the large interior lakes.^[8] The oldest known site on the Sainte-Marguerite is found on the portage, a temporary halt where hunters took the time to cut or sharpen spear points about 4,000 years ago. Another site along the Grand Portage is on the north shore of Lac Jourdain (map), containing 11 structures with 61 stone tools and over 7,000 shards.^[9]

A site on the upper river dating to between 600 and 1000 years ago indicates that the occupants caught fish and smoked their catch there. The site seems to have been occupied only occasionally, and only by men rather than by families. A prehistoric site of about 350 square metres (3,800 sq ft) has been identified on the flat right shore of the Rivière Jean-Pierre, at the extreme northeast of the SM-3 reservoir. Excavation of a small part of the site has found 35 stone tools, 383 splinters and six or seven fireplaces. There were 21 types of stone in the assembly, indicating that the occupants were in contact with groups to their west, northwest and north.^[9]

There are three hydroelectric dams on the river, the first two near its mouth and the third and largest about 90 kilometres (56 mi) inland.