| Rivière à la Loutre | |
| Subdivision Type1: | Country |
| Subdivision Name1: | Canada |
| Subdivision Type2: | Province |
| Subdivision Name2: | Quebec |
| Subdivision Type3: | Region |
| Subdivision Name3: | Saguenay-Lac-Saint-Jean |
| Subdivision Type4: | Regional County Municipality |
| Subdivision Name4: | Maria-Chapdelaine Regional County Municipality |
| Length: | 10.5km (06.5miles) |
| Source1: | Lac à la Truite |
| Source1 Location: | Rivière-Mistassini |
| Source1 Coordinates: | 48.9728°N -72.8119°W |
| Source1 Elevation: | 255m (837feet) |
| Mouth: | Ashuapmushuan River |
| Mouth Location: | Saint-Thomas-Didyme] |
| Mouth Coordinates: | 48.8797°N -72.8258°W |
| Mouth Elevation: | 180m (590feet) |
| Progression: | Ashuapmushuan River, Lac Saint-Jean, Saguenay River, Saint Lawrence River |
| Tributaries Left: | (upstream) stream, discharge from Lac du Fly, discharge from a small lake, 3 streams. |
| Tributaries Right: | (upstream) discharge from Lac de la Roche, discharge from Lac Équerre, discharge from Lake Albéric, discharge from Lac à la Loutre, stream. |
The rivière à la Loutre is a tributary of the Ashuapmushuan River, flowing in the unorganized territory of Rivière-Mistassini and in the municipality of Saint-Thomas-Didyme, in the Maria-Chapdelaine Regional County Municipality, in the administrative region of Saguenay–Lac-Saint-Jean, in the province of Quebec, in Canada.
The valley of the Rivière à la Loutre is mainly served by forest roads including the R-0202 in the upper part.[1]
Forestry is the main economic activity in this valley.
Rivière à la Loutre has its source at the mouth of Lac à la Truite (length: ; altitude:) located in the unorganized territory of Rivière-Mistassini, just north-west of the limit of the municipality of Saint-Thomas-Didyme. This lake is fed by the discharge of a stream (coming from the northwest) and by the discharge (coming from the south) of a group of lakes including Lake Raymond and Lake Carré.
The mouth of Lac à la Truite is located in a forest zone in the Rivière-Mistassini territory, at:
From the mouth of Lac à la Truite, the Rivière à la Loutre flows over, with a drop of, entirely in forest area, depending on the segments following:
Rivière à la Loutre flows into a bend in the river on the north bank of the Ashuapmushuan river at downstream from the confluence of the Petite rivière aux Saumons and upstream of the Rapide Pas background. The confluence of the Rivière à la Loutre is located at:
From the mouth of Rivière à la Loutre, the current descends the course of the Ashuapmushuan River on, then crosses lac Saint-Jean eastward on (ie its full length), follows the course of the Saguenay River via la Petite Décharge on eastward to at Tadoussac where it meets the Estuary of Saint Lawrence.[2]
The toponym "rivière à la Loutre" was made official on December 5, 1968, at the Place Names Bank of the Commission de toponymie du Québec.[3]