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Brock West
Nottaway map.png
Watershed of Nottaway River
Country Canada
Province Quebec
Region Nord-du-Québec
Physical characteristics
Main source Brock Lake
Eeyou Istchee Baie-James, Nord-du-Québec, Quebec
423 m (1,388 ft)
River mouth Chibougamau River
Eeyou Istchee Baie-James, Nord-du-Québec, Quebec
346 m (1,135 ft)
Length 28.9 km (18.0 mi)

The West Brock River is a tributary of the Brock River, Brock River, flowing into the Eeyou Istchee Baie-James, in Jamésie, in the administrative region of Nord-du-Québec, in the province of Quebec, in the Canada. The course of the river crosses successively (from the upstream) the townships of La Rochette, Livillier and La Touche.

The lower portion of the "West Brock River" hydrographic slope is accessible by a few forest roads from the south where route 113 connects Lebel-sur-Quévillon to Chibougamau. This road goes south of Opémisca Lake.

The surface of the "West Brock River" is usually frozen from early November to mid-May, however, safe ice circulation is generally from mid-November to mid-April.


The main hydrographic slopes adjacent to the "West Brock River" are:

The "West Brock River" originates at the mouth of a small unidentified lake (length: 0.4 kilometres (0.25 mi), altitude: 453 metres (1,486 ft)) in the township of La Rochette, in the Assinica Wildlife Sanctuary. This source is located on the southwestern side of a mountain whose summit reaches 488 metres (1,601 ft) at:

From its source, the "Brock River West" flows over 28.9 kilometres (18.0 mi) according to the following segments:

  • 19.3 kilometres (12.0 mi) South, southwest to a small lake, then South, to a dump (coming from the west) of a group of lakes;
  • 2.5 kilometres (1.6 mi) to the South, then to the East at the end of the segment, to the discharge (coming from the West) of two lakes;
  • 7.1 kilometres (4.4 mi) East, then South, to its mouth.

The "West Brock River" flows into the North bank of the Brock River (Chibougamau River) into a river bend, downstream of a series of falls and rapids. From there, the current descends towards the South-West by borrowing the Brock River (Chibougamau River). From the mouth of the river, the current flows to the Southwest through the Chibougamau River, then through Waswanipi River to the East shore of Goéland Lake (Waswanipi River). The latter is crossed to the northwest by the Waswanipi River which is a tributary of Matagami Lake.

The mouth of the "West Brock River" located at:


This hydronym evokes the memory of Reginald W. Brock, who, at the end of the 1896 geological exploration campaign, was assistant to Dr. Robert Bell of the Geological Survey of Canada, made a rapid geological reconnaissance of the road between the lakes Waswanipi Lake and Mistassini through the rivers Waswanipi, Chibougamau and Barlow and the Lake Waskonichi. Reginald W. Brock, Director of the Geological Survey of Canada, provided the work maps and survey instruments for the 1910 Chibougamau Geological Survey (Quebec) expedition.

The toponym "Brock River West" was formalized on December 5, 1968, at the Commission de toponymie du Québec, i.e. at the creation of this commission

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