A few other secondary forest roads serve the "La Grosse Décharge" valley, mainly for forestry and recreational tourism activities.

The surface of "La Grosse Décharge" is usually frozen from the beginning of December to the end of March, however the safe circulation on the ice is generally made from mid-December to mid-March.

The mouth of this lake is located at: From its source, "La Grosse Décharge" flows over 9.8 km (6.1 mi) with a drop of 69 m (226 ft) entirely in the forest zone, according to the following segments: The Grosse Décharge pours on the west bank of the rivière à Mars.

This confluence is located at: From the confluence of "La Grosse Décharge" with the rivière à Mars, the current follows the course of the rivière à Mars on 14.5 km (9.0 mi) towards the northwest then towards the northeast, crosses the bay Ha!

[3] The toponym "La Grosse Décharge" was formalized on December 5, 1968, at the Place Names Bank of the Commission de toponymie du Québec.