| Blanche River (Saint-Casimir) | |
| Native Name: | Saint-Ubalde |
| Pushpin Map: | Quebec |
| Subdivision Type1: | Country |
| Subdivision Name1: | Canada |
| Subdivision Type2: | Province |
| Subdivision Name2: | Quebec |
| Subdivision Type3: | Region |
| Subdivision Name3: | Capitale-Nationale, Mauricie |
| Subdivision Type4: | Regional County Municipality |
| Subdivision Name4: | Portneuf Regional County Municipality |
| Subdivision Type5: | Municipalities |
| Subdivision Name5: | Saint-Ubalde, Saint-Alban and Saint-Casimir |
| Length: | 29.25km (18.18miles) |
| Discharge1 Location: | Saint-Casimir |
| Source1: | Lac Blanc |
| Source1 Location: | Saint-Ubalde, MRC Portneuf Regional County Municipality |
| Source1 Coordinates: | 46.8192°N -72.2717°W |
| Source1 Elevation: | 143m (469feet) |
| Mouth: | Noire River |
| Mouth Location: | Saint-Casimir |
| Mouth Coordinates: | 46.6735°N -72.1302°W |
| Mouth Elevation: | 18m (59feet) |
| Tributaries Left: | (Upward from the mouth) Ruisseau Langlois, décharge du lac Travers, Weller River, ruisseau Boisvert |
| Tributaries Right: | (Upward from the mouth) Ruisseau Saint-Joseph-Saint-Léon, ruisseau du Centre, cours d'eau Morel, ruisseau Bras Fanfan |
The Blanche River (St-Casimir) is a stream flowing in the municipalities of Saint-Ubalde, Saint-Thuribe, Saint-Alban and Saint-Casimir, in the Portneuf Regional County Municipality, in the administrative region from Capitale-Nationale, to Quebec, to Canada.
The White River flows mainly in an agricultural environment, while passing near the villages of Saint-Ubalde and Saint-Casimir.
The surface of the Blanche River (except the rapids areas) is generally frozen from the beginning of December to the end of March, but the safe circulation on the ice is generally made from the end of December to the beginning of March.
The watershed of the Blanche River has an area of .[1] This basin represents 37% of that of the Noire River.
The Blanche river rises at Lac Blanc (altitude of 143 m), in Saint-Ubalde. This lake is supplied with:
With 3.75 km long, Lac Blanc is renowned for its resort and recreational tourism activities, including camping and nautical activities. The mouth is located southwest of Lac Blanc.
Course in Saint-Ubalde
From the mouth of Lac Blanc, the Blanche river turns southeast for 1.1 km to the mouth of Boisvert stream (note: approximately 215 m after the mouth, the current crosses the Morissette Falls). Then the river goes south for 9.1 km passing northeast of the village of Saint-Ubalde, then recovering the waters of the "arm fafan" and "Morel stream".
The river continues its descent over 1.3 km to the mouth of the Weller River (receiving the waters of Carillon Lake, Sept-Îles), Anguilla and "Lac en Coeur"). From there, the waters flow south over a segment of 360 m to reach the limit of Saint-Thuribe.
Course in Saint-Thuribe, Saint-Alban and Saint-Casimir
Then, the river flows 4.4 km to the southeast in Saint-Thuribe. Then the river makes a 2.1 km foray into Saint-Alban by crossing the Chute at Bélanger and passing by a saw, to return to flow in Saint-Thuribe. From this municipal limit, the river descends for 1.25 km to the mouth of the outlet of Lac Travers. Then, the river flows 8.2 km south in Saint-Thuribe to its confluence where it flows on the west bank of the Black River. From there, this last 1.8 km route to the south to empty into the Sainte-Anne River, near Grandbois Island, at the eastern edge of the village from Saint-Casimir. This confluence is located 4.2 km (measured by the current) upstream from the limit of the MRC of Portneuf Regional County Municipality or 8.1 km upstream from the bridges of Autoroute 40 or 11.5 km upstream from the mouth of the Sainte-Anne River.[2]
The Blanche River watershed is located mainly in a forest environment, with the exception of the downstream section of the river, i.e. in a highly agricultural environment.[3]
The toponym "Rivière Blanche" (Saint-Casimir) was formalized on December 5, 1968, at the Place Names Bank of the Commission de toponymie du Québec.[4]