| Nadeau River | |
| Pushpin Map: | Quebec |
| Subdivision Type1: | Country |
| Subdivision Name1: | Canada |
| Subdivision Type2: | Province |
| Subdivision Name2: | Quebec |
| Subdivision Type3: | Administrative region |
| Subdivision Name3: | Chaudière-Appalaches |
| Subdivision Type4: | RCM |
| Subdivision Name4: | Robert-Cliche Regional County Municipality, La Nouvelle-Beauce Regional County Municipality |
| Source1: | Mountain and agricultural streams |
| Source1 Location: | Saint-Séverin |
| Mouth: | Chaudière River |
| Mouth Location: | Vallée-Jonction |
| Progression: | Chaudière River, St. Lawrence |
| Tributaries Left: | (upstream) ruisseau Guay |
| Tributaries Right: | (upstream) |
The Nadeau River (in French: rivière Nadeau) is a tributary of the west bank of the Chaudière River which flows northward to empty onto the south bank of the St. Lawrence River. It flows in the administrative region of Chaudière-Appalaches, in Quebec, in Canada, in the Robert-Cliche Regional County Municipality (in the municipality of Saint-Séverin)and La Nouvelle-Beauce Regional County Municipality (in the municipalities of Saint-Elzéar, of Sainte-Marie-de-Beauce, of Vallée-Jonction).
The main neighboring watersheds of the Nadeau River are:
The Nadeau river has its source in the northern part of the municipality of Saint-Séverin, at north-west of the center of the village of Tring-Jonction, at north-west of the center of the village of Saint-Séverin and at west of the Chaudière River.From its source, the Nadeau River flows over divided into the following segments:
The Nadeau river empties on the west bank of the Chaudière River, in Vallée-Jonction. This confluence is located downstream of the bridge in the village of Vallée-Jonction, at upstream of the Sainte-Marie-de-Beauce and at upstream from the confluence of the Savoie River.
The toponym Rivière Nadeau was formalized on December 5, 1968, at the Commission de toponymie du Québec.[2]