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Bras Saint-Nicolas
Confluence of the Bras Saint-Nicolas with the rivière du Sud (Montmagny) at Montmagny.
Bras Saint-Nicolas is located in Quebec
Bras Saint-Nicolas
Country Canada
Province Quebec
Region Chaudière-Appalaches
MRC Montmagny Regional County Municipality
Physical characteristics
Main source Agricultural streams
361 metres (1,184 ft)
46°54′59″N 70°15′15″W / 46.916343°N 70.254113°W / 46.916343; -70.254113
River mouth Rivière du Sud (Montmagny)
10 metres (33 ft)
46°58′47″N 70°33′16″W / 46.97972°N 70.55444°W / 46.97972; -70.55444
Length 45.5 kilometres (28.3 mi)
Basin features
Progression Rivière du Sud (Montmagny), St. Lawrence River
  • Left:
    (upstream) rivière des Perdrix, rivière des Gagnon, ruisseau Normand, ruisseau des Castors, ruisseau Aubert, ruisseau Guimont, Cloutier River, ruisseau Fortin
  • Right:

The Bras Saint-Nicolas (in English: Saint-Nicolas Arm) is a tributary of the south-eastern bank of the rivière du Sud (Montmagny), which flows north-east to the south bank of the St. Lawrence River.

The Bras Saint-Nicolas flows in the municipalities of Sainte-Apolline-de-Patton, Cap-Saint-Ignace, aint-Cyrille-de-Lessard, Saint-Eugène, Notre-Dame-de-Bonsecours and Montmagny, in the Montmagny Regional County Municipality, in the administrative region of Chaudière-Appalaches, in Quebec, in Canada.


The main neighboring watersheds of Bras Saint-Nicolas are:

The Bras Saint-Nicolas has its source at the confluence of the Méchant Pouce River and Fortin stream, in the municipality of Sainte-Apolline-de-Patton. This spring is located on the west side of the hamlet "L'Espérance", on the north slope of the Notre Dame Mountains.

From its source, the Bras Saint-Nicolas flows over 45.5 kilometres (28.3 mi), divided into the following segments:

Upper course of the river

  • 2.2 kilometres (1.4 mi) northwesterly in Sainte-Apolline-de-Patton, to the bridge at the municipal boundary of Cap-Saint-Ignace;
  • 4.1 kilometres (2.5 mi) northward in Cap-Saint-Ignace, collecting water from the Cloutier River, to a forest road;
  • 5.4 kilometres (3.4 mi) towards the north-west in Cap-Saint-Ignace, collecting the discharge of Isidore lake (coming from the east), up to the municipal limit of Saint-Cyrille-de-Lessard;
  • 6.5 kilometres (4.0 mi) north in Saint-Cyrille-de-Lessard, collecting water from the Guimont stream and Bras d'Apic, crossing a series of waterfalls and rapids, up to the municipal limit of Saint-Eugène;
  • 3.4 kilometres (2.1 mi) north-west, collecting water from Bras de Riche, until you reach a road;

Lower course of the river

  • 4.3 kilometres (2.7 mi) west, to a road;
  • 2.1 kilometres (1.3 mi) southwesterly in Saint-Eugène, to the municipal limit of Cap-Saint-Ignace;
  • 2.0 kilometres (1.2 mi) southwesterly in Cap-Saint-Ignace, to the highway 20 bridge;
  • 1.7 kilometres (1.1 mi) west, up to the bridge;
  • 2.2 kilometres (1.4 mi) towards the southwest, passing south of the village of Cap-Saint-Ignace, to the road;
  • 3.7 kilometres (2.3 mi) southwesterly, along highway 20, to a road bridge;
  • 3.0 kilometres (1.9 mi) southwesterly in Cap-Saint-Ignace, to the municipal limit of Montmagny;
  • 4.9 kilometres (3.0 mi) towards the south-west, collecting the waters of the rivière des Perdrix (coming from the south-east), then towards the northwest to its confluence.

The Bras Saint-Nicolas empties onto the south-eastern bank of the rivière du Sud (Montmagny). This confluence is located upstream from the route 132 bridge, downstream from the route 283 bridge, in the heart of the village of Montmagny.


In a lower segment, parallel to the St. Lawrence River, the Bras Saint-Nicolas meanders at an altitude of about fifteen meters, crossing a stronghold granted in 1672 to Nicolas Gamache by the intendant Jean Talon. A first hypothesis associates the origin of the toponym "Bras Saint-Nicolas" with this pioneer. Another hypothesis is rather referred to other to Nicolas Després, father of Geneviève Després whose husband, Louis Couillard de Lespinay, had bought the seigneury of Rivière-du-Sud in 1654 and 1655.

In 1802, the toponym “R. St. Nicholas' appears on a map by surveyor Samuel Holland. In 1803, the toponym appeared on a map of Vondenvelden with the generic Bras. In 1815, Joseph Bouchette also identified it by the same generic, a term used to designate a tributary or a subdivision of a watercourse.

The toponym "Bras Saint-Nicolas" was made official on December 5, 1968 at the Commission de toponymie du Québec.

List of bridges

Sleepers Photo Municipality (ies) Year of construction Road Length Bridge type
Bridge 05076 Cap-Saint-Ignace 1939 Route of Hope 28.1 metres (92 ft) Reinforced concrete girder bridge
Pierre-Noël Bridge Saint-Cyrille-de-Lessard 1952 Route Pierre-Noël 17.9 metres (59 ft) Steel-timber bridge
Bernier Bridge L'Islet 1891 Norman path 54.8 metres (180 ft) Bridge with intermediate steel deck
Fafard Bridge L'Islet 1966 Lamartine Road West 57.1 metres (187 ft) Reinforced concrete girder bridge
Bridge 05075S Cap-Saint-Ignace 1966 Highway 20 East 85.3 metres (280 ft) Steel girder bridge
Bridge 05075N Cap-Saint-Ignace 1970 Highway 20 West 85.3 metres (280 ft) Steel girder bridge
Blanchet Bridge Cap-Saint-Ignace 1929 Four-Chemins Road 70.5 metres (231 ft) Lower steel deck bridge
Bridge 13999 Cap-Saint-Ignace 1970 Route du Petit-Cap 75.7 metres (248 ft) Precast prestressed concrete girder bridge
Bridge 05081 Cap-Saint-Ignace 1930 Bellavance Road 55.5 metres (182 ft) Steel-wood bridge
Bridge 10810 Montmagny 1891 Cloutier Street 55.6 metres (182 ft) Lower steel deck bridge
Railway bridge Montmagny Canadian National Railway Steel girder bridge
Bridge 05131 Montmagny 1957 Saint-Ignace Street 47.0 metres (154.2 ft) Reinforced concrete portal bridge
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