| Rivière au Saumon | |
| Subdivision Type1: | Country |
| Subdivision Name1: | Canada |
| Subdivision Type2: | Province |
| Subdivision Name2: | Quebec |
| Subdivision Type3: | Region |
| Subdivision Name3: | Estrie |
| Subdivision Type4: | MRC |
| Subdivision Name4: | Le Haut-Saint-François Regional County Municipality |
| Subdivision Type5: | Municipality |
| Subdivision Name5: | Weedon |
| Length: | 23km (14miles) |
| Source1: | Brompton Lake |
| Source1 Location: | Saint-Denis-de-Brompton |
| Source1 Coordinates: | 45.4706°N -72.1325°W |
| Source1 Elevation: | 239m (784feet) |
| Mouth: | Saint-François River |
| Mouth Location: | Melbourne |
| Mouth Coordinates: | 45.4706°N -72.1167°W |
| Progression: | Saint-François River, Saint Lawrence River |
| Tributaries Left: | (upstream) Horre stream, Gulf stream |
| Tributaries Right: | (upstream) ruisseau des Vases |
The rivière au Saumon (English: Salmon River) is a tributary of the Saint-François River, on the South Shore of the Saint Lawrence River, in the province of Quebec, Canada. The river has a basin of and has its source in lake Brompton.
The course of the Rivière au Saumon crosses the territories of the Le Val-Saint-François Regional County Municipality (administrative region of Estrie): Saint-Denis-de-Brompton, Racine, Kingsbury and Melbourne.
Besides the village areas, forestry is the main economic activity in this valley; agriculture, second especially in the lower part.
The surface of the Salmon River is usually frozen from mid-December to mid-March, except the rapids areas; however, safe circulation on the ice is generally from late December to early March.
The main hydrographic slopes neighboring the Salmon River are:
The Rivière au Saumon constitutes the outfall of lake Brompton, the mouth of which is located northeast of the lake, north of the hamlet "Lac-Brompton", in the territory of the municipality of Saint-Denis-de-Brompton.
From the route 222 bridge located at the mouth of Lac Brompton, the Salmon River flows to the bottom of a valley on:
The Rivière au Saumon flows on the west bank of the Saint-François River at downstream from Morin Island, at downstream Pont des Papetiers (connecting the hamlet of "Greenlay" and the town of Windsor) and upstream of the Mackenzie Bridge (connecting Melbourne and Richmond).
Formerly, this river was designated by its English name: "Salmon Brook River". The Abenaki use the name "Madakik", meaning "bad land".
The toponym "Rivière au Saumon" was officially registered on December 5, 1968, at the Commission de toponymie du Québec.[2]