| Rivière à la Loutre | |
| Name Other: | Old name: "Anderson River" |
| 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: | Le Fjord-du-Saguenay Regional County Municipality |
| Length: | 14km (09miles) |
| Source1: | Confluence of two mountain streams |
| Source1 Location: | Saint-Fulgence |
| Source1 Coordinates: | 48.5403°N -70.9192°W |
| Source1 Elevation: | 231m (758feet) |
| Mouth: | Saguenay River |
| Mouth Location: | Saint-Fulgence |
| Mouth Coordinates: | 48.4544°N -70.9194°W |
| Mouth Elevation: | 4m (13feet) |
| Progression: | Saguenay River, Saint Lawrence River |
| Tributaries Left: | (upstream) |
| Tributaries Right: | (upstream) |
The rivière à la Loutre (English: Otter River) is a tributary of the Saguenay River, flowing in the municipality of Saint-Fulgence in the Le Fjord-du-Saguenay Regional County Municipality, in the administrative region of Saguenay-Lac-Saint-Jean, in Quebec, in Canada.
The route 172 (route de Tadoussac) crosses the river atthe Otter at its mouth. Rang Saint-Louis road (north–south direction)serves the west side of this river.
Forestry is the sector's primary economic activity; second, recreational tourism activities.
The surface of Rivière à la Loutre is usually frozen from late November to early April, however safe traffic on the ice is generally from mid-December to late March.
The main neighboring watersheds of the Rivière à la Loutre are:
The Rivière à la Loutre takes its source from a mountain stream (altitude:). This source is located at: to the south of the course of the le Petit Bras and at to the north-west from the mouth of the river to the Otter.
From its source, at the confluence of two mountain streams, the course of the Rivière à la Loutre descends on according to the following segments:
The mouth of the Rivière à la Loutre flows onto the north shore of the Saguenay River in the municipality of Saint-Fulgence. This confluence of the Rivière à la Loutre is located at:
From the mouth of the Rivière à la Loutre, the current follows the course of the Saguenay River eastwards to the height of Tadoussac where it meets the Saint Lawrence River.[1]
The toponym Rivière à la Loutre was formalized on December 5, 1968, at the Place Names Bank of the Commission de toponymie du Québec.[2]