Rivière des Perdrix
Location
Country	Canada
Province	Quebec
Region	Chaudière-Appalaches
MRC	Montmagny Regional County Municipality
Physical characteristics
Source	Mountain and forest streams
• location	Notre-Dame-du-Rosaire
• coordinates	46°51′51″N 70°24′18″W / 46.864216°N 70.404992°W / 46.864216; -70.404992
• elevation	408 metres (1,339 ft)
Mouth	Bras Saint-Nicolas
• location	Montmagny
• coordinates	46°59′09″N 70°31′01″W / 46.98583°N 70.51694°W / 46.98583; -70.51694
• elevation	10 metres (33 ft)
Length	32.3 kilometres (20.1 mi)
Basin features
Progression	Bras Saint-Nicolas, Rivière du Sud (Montmagny), St. Lawrence River
Tributaries
• left	(upstream) ruisseau des Prairies
• right	(upstream) cours d'eau Gagné, Rivière Inconnue (rivière des Perdrix)

The rivière des Perdrix flows in the municipalities of Notre-Dame-du-Rosaire, Cap-Saint-Ignace and Montmagny, in the Montmagny Regional County Municipality, in the administrative region of Chaudière-Appalaches, in Quebec, in Canada.

The Rivière des Perdrix is a tributary of the south bank of the Bras Saint-Nicolas, which flows on the southeast bank of the rivière du Sud (Montmagny); the latter flows north-east to the south shore of the St. Lawrence River.

The main neighboring watersheds of the Perdrix river are:

• north side: St. Lawrence River, Bras Saint-Nicolas;
• east side: Guimont stream, Bras Saint-Nicolas, Inconnue River;
• south side: rivière du Sud (Montmagny), Fraser River, Alick River;
• west side: rivière du Sud (Montmagny), Bras Saint-Nicolas.^[1]

The Perdrix River has its source on the northern slope of the "Maple Mountain", on the northern slope of the Notre Dame Mountains, in the municipality of Notre-Dame-du-Rosaire. Several branches of mountain and forest streams feed the head of the Perdrix River.^[1]

From its source, the Perdrix River flows over 32.3 kilometres (20.1 mi), divided into the following segments:

• 3.3 kilometres (2.1 mi) north-east in Notre-Dame-du-Rosaire, to the confluence of a stream branch (coming from the south);
• 5.9 kilometres (3.7 mi) northward, up to the confluence of the Inconnue River (coming from the south-east);
• 0.8 kilometres (0.50 mi) north, to the limit between Notre-Dame-du-Rosaire and Cap-Saint-Ignace;
• 13.2 kilometres (8.2 mi) north, up to Chemin des Érables-Ouest;
• 5.6 kilometres (3.5 mi) west, crossing the route des Pommiers, to Chemin Bellevue-Ouest;
• 1.3 kilometres (0.81 mi) west, to the limit between Cap-Saint-Ignace and Montmagny;
• 1.9 kilometres (1.2 mi) west, to highway 20;
• 0.3 kilometres (0.19 mi) north, up to its confluence.^[1]

Rivière des Perdrix flows on the south shore of Bras Saint-Nicolas. This confluence is located 1.6 kilometres (0.99 mi) from the south shore of St. Lawrence River, at 1.3 kilometres (0.81 mi) downstream of the limit between Cap-Saint-Ignace and Montmagny, as well as 3.1 kilometres (1.9 mi) upstream of the railway bridge that crosses the town of Montmagny.^[1]

The toponym Rivière des Perdrix was formalized on December 5, 1968, at the Commission de toponymie du Québec.^[2]

• List of rivers of Quebec