This river crosses administrative regions: This river runs eastward from an agricultural plain at the north side of several urban areas, in parallel with the Rivière des Mille Îles.

On the Christian origin, the place name is known since the beginning of the concession of the Seigneurie des Plaines, circa 1731.

This name is attested the first time in 1853 with exact location on the map of Francis Joseph Bouchette.

The erection of documents of the parish of Mascouche, 1829-1831, indicate that the St. Pierre River has been designated "Ruisseau de la Plaine".

St Mary ", echoing the designation appearing in a confession and enumeration of Seigneurie de Terrebonne in 1736.