| Rivière Saumon Ouest | |
| Subdivision Type1: | Country |
| Subdivision Name1: | Canada |
| Subdivision Type2: | Province |
| Subdivision Name2: | Quebec |
| Subdivision Type3: | Region |
| Subdivision Name3: | Outaouais |
| Subdivision Type4: | MRC |
| Subdivision Name4: | Papineau Regional County Municipality |
| Subdivision Type5: | Municipality |
| Subdivision Name5: | Notre-Dame-de-Bonsecours |
| Length: | 14.3km (08.9miles) |
| Source1: | Lake Sugar Bush |
| Source1 Location: | Notre-Dame-de-Bonsecours |
| Source1 Coordinates: | 45.7908°N -74.7958°W |
| Source1 Elevation: | 241m (791feet) |
| Mouth: | Saumon River |
| Mouth Location: | Notre-Dame-de-Bonsecours |
| Mouth Coordinates: | 45.7103°N -74.8431°W |
| Mouth Elevation: | 107m (351feet) |
| Progression: | Ottawa River, Saint Lawrence River, gulf of Saint Lawrence |
| Tributaries Left: | (upstream) discharge from a few lakes, Red Cove, discharge from a few lakes including Puant Lake, discharge from several lakes, discharge from several lakes, discharge from a few lakes, discharge from a few lakes, discharge from three lakes. |
| Tributaries Right: | (upstream) 3 streams, discharge from three small lakes, discharge from Saddle Lake. |
The Rivière Saumon Ouest (English: Salmon River West) is a tributary of the Saumon River, flowing only in the territory of the municipality of Notre-Dame-de-Bonsecours, in the Papineau Regional County Municipality, in the administrative region of Outaouais, in the province from Quebec, to Canada.
This small valley is mainly served by the Kenauk road (East–west direction), the Angèle Coast and the Azélie Coast.
Forestry (especially forestry) is the main economic activity in this valley.
The West Salmon River originates from Sugar Bush Lake (length: ; altitude:) located in forest area.
The mouth of Sugar Bush Lake is located on the south side, at the bottom of a bay stretching over . From the mouth of Sugar Bush Lake, the West Salmon River descends on, with a drop of, according to the following segments:
From the confluence of the Saumon West river and the Saumon river, the current descends on following the course of the Saumon river to the north bank of the Ottawa River; then on following the course of the Ottawa River, to St. Lawrence River.
The toponym "Rivière Saumon Ouest" was formalized on November 3, 1983, at the Place Names Bank of the Commission de toponymie du Québec.[2]