This river of Middle Mauricie has played an important role in the forestry industry at the end of the 19th century.

The mouth is located almost opposite the Mekinac island near the west bank of the Saint-Maurice River.

This river has many rapids, making it navigable for shallow-draft, especially in the Spring and only in certain segments outside periods of major floods.

The river is usually frozen from December to late March, except in some areas of strong rapids.

In its descent, the Mekinac river receives on its right bank the water of the stream Dumont, and on its left bank streams Thom (taking its source at Lake Thom, George, to Bouchard and Le Jeune) and Vlimeux (taking its source at Lake Vlimeux).