| Boyer River | |
| 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 |
| Subdivision Type5: | Municipality |
| Subdivision Name5: | Saint-Charles-de-Bellechasse, Saint-Michel-de-Bellechasse and Saint-Vallier |
| Length: | 34km (21miles) |
| Source1: | Confluence of Boyer River North et Boyer River South |
| Source1 Location: | Saint-Charles-de-Bellechasse |
| Source1 Coordinates: | 46.7283°N -70.9644°W |
| Source1 Elevation: | 61m (200feet) |
| Mouth: | Chenal des Grands Voiliers (Saint Lawrence River) |
| Mouth Location: | Saint-Michel-de-Bellechasse |
| Mouth Coordinates: | 46.8856°N -70.8603°W |
| Mouth Elevation: | 4m (13feet) |
| Tributaries Left: | (upstream) ruisseau Blais, ruisseau des Sources, ruisseau Nadeau, ruisseau Boucher, ruisseau Labrie, Boyer River North |
| Tributaries Right: | (upstream) ruisseau du Portage, ruisseau des Boutin, Boyer River South |
The Boyer River (Rivière Boyer in French)[1] is a tributary of Chenal des Grands Voiliers, on the south shore of Saint Lawrence River. This small river of about 40km (30miles) in length flows in the municipalities of Saint-Charles-de-Bellechasse, Saint-Michel-de-Bellechasse and Saint-Vallier, in the Bellechasse Regional County Municipality, in the administrative region of Chaudière-Appalaches, in Quebec, in Canada.[2]
The lower part of this valley is served by the route 132 which runs along the southeast bank of the St. Lawrence River, and also by the road of the second range West (which becomes Rang Nord-Est and Avenue Royale, further south), Chemin du 3e rang Ouest (which becomes Chemin du rang Sud-Est, further south).
Apart from a few forest areas crossed by the river, agriculture is the main economic activity in this valley.
The surface of the Boyer River is generally frozen from the beginning of December until the end of March, except the rapids areas; however, safe circulation on the ice is generally done from mid-December to mid-March. The water level of the river varies with the seasons and the precipitation; the spring flood occurs in March or April.
The Boyer River rises at the confluence of the Boyer North River and Boyer South River rivers, at Saint-Charles-de-Bellechasse. This source is located in range Nord-Ouest 4.8 km south-west of the center of the village of Saint-Charles-de-Bellechasse, south-east of Plée de Saint-Charles and 1, 3 km northeast of the limit of Saint-Henri.
From its source, the Boyer River flows 34.0 km, divided into the following segments:
The Boyer river flows onto the long shore of the Saint-Vallier bank, in the Saint-Vallier cove, on the south bank of the Saint Lawrence River. This confluence is located on the west side of the village of Saint-Vallier, on the east side of the village of Saint-Michel-de-Bellechasse and opposite the village of Saint-Jean-de-l'Île-d'Orléans located on Île d'Orléans.[3] This confluence is located east of the confluence of the Mothers river and the Bellechasse stream.
Its main tributaries are:
The toponym "rivière Boyer" was officialized on December 5, 1968, at the Commission de toponymie du Québec.[4]