| Blanche River | |
| Pushpin Map: | Quebec |
| Subdivision Type1: | Country |
| Subdivision Name1: | Canada |
| Subdivision Type2: | Province |
| Subdivision Name2: | Quebec |
| Subdivision Type3: | Region |
| Subdivision Name3: | Chaudière-Appalaches |
| Subdivision Type4: | MRC |
| Subdivision Name4: | Bellechasse Regional County Municipality |
| Source1: | Agricultural streams |
| Source1 Location: | La Durantaye |
| Mouth: | Rivière des Mères |
| Mouth Location: | Saint-Vallier |
| Progression: | Rivière des Mères, St. Lawrence River |
| Tributaries Right: | (upstream) Décharge du lac aux Canards, ruisseau Corriveau |
The Blanche River (in French: rivière Blanche) is a tributary of the southeast shore of the Mères River which flows northeast to the south shore of the St. Lawrence River. This watercourse flows in the municipalities of La Durantaye and Saint-Vallier, in the regional county municipality (MRC) of Bellechasse, in the administrative region of Chaudière-Appalaches, in the province of Quebec, in Canada.
The Blanche river has its source on the south side of the village of La Durantaye, on the east side of rue Norbert-Morin. This spring is located south of the village of La Durantaye and west of "Lac aux Canards". The Blanche river flows north-east especially in agricultural areas, more or less parallel (on the south-east side) to the rivière des Mères.
From its source, the Blanche river "flows over, divided into the following segments:
The Blanche river empties on the south-eastern bank of the Mères river, very close to the "Montée de la Station" road bridge. This confluence is located on the north side of Highway 20 (near exit 356), south of the village of Saint-Vallier.[1]
The toponym Rivière Blanche was formalized on December 5, 1968, at the Commission de toponymie du Québec.[2]