The bras de Jacob 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.
Geography
The main watersheds neighboring of bras de Jacob are:
The bras de Jacob rises at the mouth of Lake Jacob in the forest area. This lake is fed by the outlet from Fournier lake, and the outlet from an unidentified lake. This source is located at:
south-west of the confluence of bras de Jacob and rivière du Moulin;
south-east of the Portage-des-Roches dam, erected at the head of the Chicoutimi River;
south of the confluence of the rivière du Moulin and the Saguenay River in the Chicoutimi sector of the city of Saguenay.
From its source, Jacob's arm flows over with a drop of entirely in the forest zone, according to the following segments:
to the east by collecting the discharge from Cami Lake, then by forming two curves towards the south, up to a bend in the river, corresponding to the discharge of Lac Desgagné;
towards the south-east, collecting a discharge from a small lake, then bending towards the east, up to bras Henriette ;
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:
south-west of the confluence of the rivière du Moulin and the Saguenay River;
south-east of downtown Saguenay.
From the mouth of "Bras de Jacob", the current successively follows the course of the rivière du Moulin on towards the north, then the course from the Saguenay River on eastwards to Tadoussac where it merges with the Saint Lawrence Estuary.
