The Ouiatchouaniche River is a tributary of Lac Saint-Jean, flowing successively in the unorganized territory of Lac-Ashuapmushuan, the municipality of Sainte-Hedwidge and the city of Roberval, in the Le Domaine-du-Roy Regional County Municipality, in the administrative region of Saguenay–Lac-Saint-Jean, in the province of Quebec, in Canada. The upper part of the Ouiatchouaniche river valley is served by forest roads. Forestry is the main economic activity in the upper and intermediate part of this valley; agriculture, in the lower part, except the urban area near the mouth. The surface of the Ouiatchouaniche River is usually frozen from the beginning of December to the end of March, except the rapids areas; however, traffic on the ice is generally safe from mid-December to mid-March. Geography The Ouiatchouaniche river has its source in Lake Quentin (length: ; altitude: ) in the unorganized territory of Lac-Ashuapmushuan. This lake is mainly supplied by the outlet (coming from the east) from Couture lake and the outlet (coming from the south) from an unidentified lake. This source is located at: west of Lac des Commissaires; south-west of the village center of Chambord; south-west of the mouth of the Ouiatchouaniche River. From its source, the Ouiatchouaniche river flows over with a drop of , according to the following segments: Upper course of the Ouiatchouaniche river (segment of ) Note: In forest area. towards the north by crossing a small lake, by collecting the discharge (coming from the west) of Surprise lake, by crossing Gareau lake (length: ; altitude: ) and crossing Lake Thomas-James (length: ; altitude: ), up to at its mouth; towards the north by collecting the discharge (coming from the west) of a set of lakes including Lac Sainte-Croix, crossing one of the Jumeaux lakes, up to the discharge of Long Summer Lake and East Lake; first by winding northwest to the outlet (coming from the southwest) of a small lake; then by winding towards the north, collecting successively the discharge (coming from the south) from Lac du Seuil, the discharge (coming from the west) from an unidentified lake, the discharge (coming from the east) from a stream, the outlet (coming from the south) from an unidentified lake, the outlet (coming from the east) from a stream, the outlet (coming from the north) from a small lake, the outlet (coming from the south) from another lake, to a stream (coming from the southwest); Intermediate course of the