The River Portage, a tributary of the southwestern shore of the Petit Saguenay River flowing successively in the municipalities of L'Anse-Saint-Jean and Petit-Saguenay in the Le Fjord-du-Saguenay Regional County Municipality, in the administrative region of Saguenay-Lac-Saint-Jean, in Quebec, in Canada.

The lower portion of the "rivière du Portage" Valley is indirectly served by Route 170 which passes on this point on the east bank of the Petit Saguenay River.

The upper part, especially around the "Lac de la Rivière" is served by the "chemin du Portage".

The surface of the Portage River is usually frozen from the beginning of December to the end of March, however, safe ice circulation is generally from mid-December to mid-March.

It takes its source from the "lake à Noël" (length: 2.7 km (1.7 mi); altitude: 472 m (1,549 ft)) which is enclosed by mountain cliffs; its mouth is located to the northeast.