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Bras de Jacob
Country Canada
Province Quebec
Region Saguenay-Lac-Saint-Jean
Regional County Municipality Le Fjord-du-Saguenay Regional County Municipality
Unorganized territory and a city Lac-Ministuk, Saguenay
Physical characteristics
Main source Lac Jacob
307 m (1,007 ft)
River mouth rivière du Moulin
220 m (720 ft)
Length 9.0 km (5.6 mi)
Basin features
  • Left:
    (from the mouth) Discharge of lac Desgagné.
  • Right:
    (from the mouth) Bras Henriette, discharge of lac Le Étangs, discharge of lac Cami, bras de Jacob West.

The bras de Jacob (English: Jacob's arm) is a tributary of the rivière du Moulin, flowing successively in the Saguenay, then in the territory not organized from Lac-Ministuk, in the Le Fjord-du-Saguenay Regional County Municipality, in the administrative region of Saguenay–Lac-Saint-Jean, in the province of Quebec, in Canada. The course of bras de Jacob crosses the northwest part of the zec Mars-Moulin.

The upper part of this small valley is served by the Lac-du-Bois-Joli road which passes on the north shore of Lac Jacob. A few other secondary forest roads serve the valley of the Jacob's arm, mainly for forestry and recreational tourism activities.

Forestry is the main economic activity in this valley; recreational tourism, second.

The surface of Jacob's arm is usually frozen from the beginning of December to the end of March, however the safe circulation on the ice is generally done from mid-December to mid-March.


The main watersheds neighboring of bras de Jacob are:

The bras de Jacob rises at the mouth of Lake Jacob (length: 0.9 km (0.56 mi); altitude: 307 m (1,007 ft)) in the forest area. This lake is fed by the outlet (coming from the northeast) from Fournier lake, and the outlet (coming from the west) from an unidentified lake. This source is located at:

From its source, Jacob's arm flows over 9.0 km (5.6 mi) with a drop of 87 m (285 ft) entirely in the forest zone, according to the following segments:

  • 5.0 km (3.1 mi) to the east by collecting the discharge (coming from the south) from Cami Lake, then by forming two curves towards the south, up to a bend in the river, corresponding to the discharge (coming from the east) of Lac Desgagné;
  • 1.6 km (0.99 mi) towards the south-east, collecting a discharge (coming from the south-east) from a small lake, then bending towards the east, up to bras Henriette (coming from the southwest);
  • 2.4 km (1.5 mi) towards the northeast curving towards the east, to its mouth.

Jacob's arm spills out onto the west bank of rivière du Moulin. This confluence is located at:

  • 2.2 km (1.4 mi) east of Desgagné Lake;
  • 8.2 km (5.1 mi) west of the course of the rivière à Mars;
  • 10.7 km (6.6 mi) north-east of Simoncouche River;
  • 12.0 km (7.5 mi) south-east of the barrage de Portage-des-Roches at the head of the Chicoutimi River;
  • 22.8 km (14.2 mi) south-west of the confluence of the rivière du Moulin and the Saguenay River;
  • 21.9 km (13.6 mi) south-east of downtown Saguenay.

From the mouth of "Bras de Jacob", the current successively follows the course of the rivière du Moulin on 37.6 km (23.4 mi) towards the north, then the course from the Saguenay River on 126.1 km (78.4 mi) eastwards to Tadoussac where it merges with the Saint Lawrence Estuary.


The toponym "bras de Jacob" was formalized on December 5, 1968, at the Place Names Bank of the Commission de toponymie du Québec.


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