| Cachée River | |
| Pushpin Map: | Quebec |
| Subdivision Type1: | Country |
| Subdivision Name1: | Canada |
| Subdivision Type2: | Province |
| Subdivision Name2: | Quebec |
| Subdivision Type3: | Region |
| Subdivision Name3: | Mauricie |
| Subdivision Type4: | Regional County Municipality |
| Subdivision Name4: | Les Chenaux Regional County Municipality |
| Subdivision Type5: | Municipality |
| Subdivision Name5: | Notre-Dame-du-Mont-Carmel |
| Length: | 17.6km (10.9miles) |
| Source1: | Lake Trotochaud |
| Source1 Location: | Notre-Dame-du-Mont-Carmel |
| Source1 Coordinates: | 46.5261°N -72.6336°W |
| Source1 Elevation: | 122m (400feet) |
| Mouth: | Saint-Maurice River |
| Mouth Location: | Notre-Dame-du-Mont-Carmel |
| Mouth Coordinates: | 46.4555°N -72.7429°W |
| Mouth Elevation: | 109m (358feet) |
| Tributaries Left: | (Upstream) Cours d’eau Brisson. |
| Tributaries Right: | (Upstream) Discharge of lac Bellevue, discharge of lac Guylvie. |
The Rivière Cachée (English: Hidden River) is a tributary of the Saint-Maurice River,[1] flowing on the north bank of the Saint Lawrence River, entirely in Notre-Dame-du-Mont-Carmel (Parish Municipality), in Les Chenaux Regional County Municipality (RCM), in Mauricie administrative region, in province of Quebec, Canada.
The course of the Hidden River descends mainly in the forest zone, passing on the west side of the of Notre-Dame-du-Mont-Carmel (Parish Municipality.
The Hidden River rises at the mouth of Valmont Lake (length: ; altitude:). This lake is located in the southern part of a large swamp area which extends in the sector of Shawinigan-Sud, in Lac-à-la-Tortue and Saint-Narcisse. This source is located at:
From its source, the Cachée river flows on, according to the following segments:
The Cachée river flows on the east bank of the Saint-Maurice river upstream of the La Gabelle dam. The confluence of the Cachée river is located upstream of the La Gabelle dam at:
The sinuousness of its course at the bottom of a flow in the lower part explains the hidden character of the river. The Hidden Coast of the old road segment connecting Shawinigan-Sud and Cap-de-la-Madeleine included curves at the bottom of the flow which formerly caused several road accidents.