| La Grande River | |
|---|---|
 La Grande River near Radisson, Quebec | |
 La Grande River original basin in yellow. Diverted basins in orange. | |
| Location | |
| Country | Canada |
| Province | Quebec |
| Region | Jamésie |
| Physical characteristics | |
| Source | Lac Nichicun |
| • location | Nitchequon |
| • coordinates | 53°12′30″N 70°56′00″W / 53.20833°N 70.93333°W |
| Mouth | James Bay |
• location | Chisasibi |
• coordinates | 53°50′00″N 79°04′00″W / 53.83333°N 79.06667°W |
• elevation | 0 m (0 ft) |
| Length | 893 km (555 mi)[1] |
| Basin size | 97,600 km2 (37,700 sq mi)[1] |
| Discharge | |
| • average | 3,400 m3/s (120,000 cu ft/s)[2] |
| • minimum | 345 m3/s (12,200 cu ft/s) |
| • maximum | 4,450 m3/s (157,000 cu ft/s) |
La Grande River (French: La Grande Rivière; Cree: Chisasibi; both meaning "great river") is a river in northwestern Quebec, Canada, rising in the highlands of the north-central part of the province and flowing roughly 900 km (560 mi) west to its drainage at James Bay. It is the second-longest river in the province, surpassed only by the Saint Lawrence River.
Originally, the La Grande River drained an area of 97,400 km2 (37,600 sq mi), and had a mean discharge of 1,690 m3/s (60,000 cu ft/s).[1] Since the 1980s, when hydroelectric development diverted the Eastmain and Caniapiscau rivers into the La Grande, its total catchment area has increased to about 175,000 km2 (68,000 sq mi), with its mean discharge being more than 3,400 m3/s (120,000 cu ft/s).[2] In November 2009, the Rupert River was also (partially) diverted, adding another 31,430 km2 (12,140 sq mi) to the basin.
At one time, the La Grande was known as the "Fort George River". The Hudson's Bay Company operated a trading post on the river, at Big River House, between 1803 and 1824. In 1837, a larger trading post was established at Fort George, on an island at the mouth of the river. In the early 20th century, this trading post became a village as the Crees of the James Bay region abandoned their nomadic way of life and settled nearby. The modern Cree village of Chisasibi, which replaced Fort George in 1980, is situated on the southern shore of the La Grande River, several kilometers to the East.
- ^ a b c Atlas of Canada Archived 10 April 2007 at the Wayback Machine (all values of original river prior to hydro-electric development.)
- ^ a b Hydro-Québec and GENIVAR Groupe Conseil inc., Environmental Monitoring of the La Grande-2-A and La Grande-1 Projects. Abridged Summary Report 1987-2000. La Grande Winter plume. July 2005 (Online version Archived 5 June 2011 at the Wayback Machine)