In its northward course, the Tortue River passes west of the village of Saint-Patrice-de-Sherrington, recovering the water from the agricultural streams Lazure, Saint-Michel and Provost.

The river flows through the heart of the village of Saint-Édouard, then collects the waters of the Boulerice-Yelle stream along (on the west side) autoroute 15 over a 7.3 km (4.5 mi) segment.

Then the river turns west and goes to the village of Saint-Mathieu where it collects the Faille stream on its left bank near the community center.

From the village of Saint-Mathieu, the river flows straight north along (east side) the railway and passing west of the hamlet Val- Wooded.

From the industrial zone, the river continues its course to the north, collecting the water from the Isabelle and Lasaline streams, passes under the autoroute 30 very close (east side) of the road of iron.