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Opaoca
Nottaway map.png
Watershed of Nottaway River
Country Canada
Province Quebec
Region Eeyou Istchee Baie-James (municipality)
Physical characteristics
Main source Anorthosite Lake
Eeyou Istchee Baie-James (municipality), Nord-du-Québec, Quebec
336 m (1,102 ft)
River mouth Olga Lake (Waswanipi River), Waswanipi River
Eeyou Istchee Baie-James (municipality), Nord-du-Québec, Quebec
256 m (840 ft)
Length 66.6 km (41.4 mi)

The Opaoca River is a tributary of Olga Lake (Waswanipi River), in Regional County Municipality (RCM) of Eeyou Istchee James Bay (municipality), in the administrative region of Nord-du-Québec, Canadian province of Quebec, in Canada.

The course of the river successively crosses the townships of Bourbaux, Berthiaume, Noyelles, Le Tardif, Comporte and Pouchot.

The hydrographic slope of the Opaoca River is served by various forest roads including the R1026 road (North-South direction). The northern route from Matagami passing at 19.4 kilometres (12.1 mi) to the northwest of the mouth of the Opaoca River. The surface of the river is usually frozen from early November to mid-May, however, safe ice circulation is generally from mid-November to mid-April.

Geography

The main hydrographic slopes near the Opaoca River are:

The Opaoca River originates at the mouth of Lake Anorthosite (length: 1.6 kilometres (0.99 mi) altitude: 336 metres (1,102 ft)). This lake straddles the townships of Bourbaux, Berthiaume and Noyelles.

The mouth of this lake is located at:

From its source, the "Opaoca River" flows on 66.6 kilometres (41.4 mi) according to the following segments:

  • 5.3 kilometres (3.3 mi) southwesterly, forming an easterly curve to the bridge of a forest road R1026 (North-South direction);
  • 24.6 kilometres (15.3 mi) southwesterly, then northwesterly, winding to a river bend;
  • 8.8 kilometres (5.5 mi) north to a creek (coming from the East);
  • 6.9 kilometres (4.3 mi) northwesterly winding to a creek (coming from the West);
  • 6.5 kilometres (4.0 mi) northeasterly to a stream (coming from the northwest);
  • 11.2 kilometres (7.0 mi) eastward in a gradual widening of the river, to a creek (coming from the East);
  • 3.3 kilometres (2.1 mi) northerly in a widening of the river to its mouth.

The "Opaoca River" empties in Elisabeth bay, an extension of Olga Lake (Waswanipi River). The latter flows is crossed at the North by the Waswanipi River.

The mouth of the Opaoca River is located at:

Toponymy

Presumably of Cree origin, the origin of this hydronym would be a deviation from the word "opawakaw", meaning that there is "a pass, a narrowing between sandbanks". The “Commission de géographie du Québec” (English: Geographical Survey of Quebec) had formalized this name in 1948. The graphism Opaoka appears on the map of the township of Pouchot designed by the Department of Lands and Forests in 1965.

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

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