| Blanche River | |
| Subdivision Type1: | Country |
| Subdivision Name1: | Canada |
| Subdivision Type2: | Province |
| Subdivision Name2: | Quebec |
| Subdivision Type3: | Region |
| Subdivision Name3: | Centre-du-Québec |
| Subdivision Type4: | MRC |
| Subdivision Name4: | Nicolet-Yamaska Regional County Municipality, Bécancour Regional County Municipality |
| Subdivision Type5: | Municipality |
| Subdivision Name5: | Sainte-Eulalie, Aston-Jonction, Saint-Wenceslas, Saint-Léonard-d'Aston, Saint-Célestin, Bécancour |
| Length: | 51.1km (31.8miles) |
| Source1: | Swampy area of Rang des Épinettes |
| Source1 Location: | Sainte-Eulalie |
| Source1 Coordinates: | 46.1351°N -72.1762°W |
| Source1 Elevation: | 91m (299feet) |
| Mouth: | Bécancour River |
| Mouth Location: | Daveluyville |
| Mouth Coordinates: | 46.2915°N -72.3845°W |
| Mouth Elevation: | 24m (79feet) |
| Progression: | Bécancour River, St. Lawrence River |
| Tributaries Left: | (upstream) ruisseau des Castors, ruisseau Gilbert, Décharge des Dix, ruisseau Beauchesne, ruisseau Ludger-Carignan, ruisseau Joanny, ruisseau Bruneau, ruisseau Deschènes, ruisseau Calixte-Tourigny, ruisseau Léveillée, ruisseau Ludger-Lemay, ruisseau Morin, ruisseau Paquin. |
| Tributaries Right: | (upstream) ruisseau Antoine-Hébert, cours d'eau Vouligny, ruisseau Bédard, ruisseau Hélie, ruisseau Fourchu, branche nord du ruisseau Gagnon, ruisseau Lupien, ruisseau Jutras. |
| Country: |  Canada |
The rivière Blanche (formerly designated "rivière Saint-Wenceslas") is a watercourse on the South shore of St. Lawrence River, in the administrative region of Centre-du-Québec, in the province of Quebec, in Canada. This river flows in the regional county municipalities of:
municipalities of Sainte-Eulalie, Aston-Jonction, Saint-Wenceslas, Saint-Léonard-d'Aston and Saint-Célestin;
city of Bécancour.
The Blanche River flows northward mainly in agricultural (or forest, in places) territory on the south shore of the St. Lawrence River.
A marshy area (by) straddling the limit of the municipalities of Sainte-Eulalie and Daveluyville (Defoy sector) constitutes the head of the waters of this river. This area is located in the Rang des Épinettes; it is drained by the Paquin stream (to the north), by the Vigneault stream (to the south) and the Béland stream (to the east). This area is located northeast of Saint-Samuel-de-Horton, southwest of Daveluyville, east of Sainte-Eulalie and south of autoroute 20.
The course of the Blanche river descends on, with a drop of, according to the following segments:
Course of the Blanche river from the head (segment of)
From the crossing of the Paquin stream and another small stream, the Blanche river flows through agricultural land on:
Course of the river downstream from the village of Saint-Wenceslas (segment of)
From the village of Saint-Wenceslas, the river continues its course especially in agricultural areas on:
Course of the river downstream of the covered bridge (segment of)
From the Étienne-Poirier covered bridge, the Blanche river continues its course, especially in agricultural areas on:
The neighboring hydrographic slopes of the Blanche River are:
Formerly, this river was designated "Saint-Wenceslas river" or "Wenceslas river".
The toponym "Rivière Blanche" was made official on November 27, 1979, at the Place Names Bank of the Commission de toponymie du Québec.[2]