The main economic activities in this valley are linked to the urban economy and particularly to tourist accommodation.

The water level of the river varies with the seasons and the precipitation; the spring flood occurs in March or April.

The Mailloux river takes its source from a small forest lake located on the northeast side of rang Saint-Joseph road, in agricultural and forestry areas.

This mouth is located at: The term "Mailloux" constitutes a family name of French origin.

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