| Saint Pierre River | |
| Subdivision Type1: | Country |
| Subdivision Name1: | Canada |
| Subdivision Type2: | Province |
| Subdivision Name2: | Quebec |
| Source1 Location: | Sainte-Anne-des-Plaines |
| Source1 Coordinates: | 45.7775°N -73.8072°W |
| Source1 Elevation: | 60m (200feet) |
| Mouth Location: | Mascouche River |
| Mouth Coordinates: | 45.7575°N -73.6592°W |
| Mouth Elevation: | 26m (85feet) |
| Length: | 16.2km (10.1miles) |
| Tributaries Left: | Lamoureux Therrien Creek, Black Creek. |
| Tributaries Right: | Lauzon Creek-Therrien. |
The Saint Pierre River is a tributary of the Mascouche River, flowing in the southwest of Quebec, in Canada. This river crosses administrative regions:
Thérèse-De Blainville Regional County Municipality; municipality of Sainte-Anne-des-Plaines;
Les Moulins Regional County Municipality; sector La Plaine of the city of Terrebonne and the city of Mascouche.
This river runs eastward from an agricultural plain at the north side of several urban areas, in parallel with the Rivière des Mille Îles.
St. Pierre River rises on the north side of the village of Sainte-Anne-des-Plaines. This source is located at:
Course of the river
From its source, the Saint Pierre River flows on, according to the following segments:
The confluence of the Saint Pierre River empties into a river bend on the north bank of the Mascouche River, is north of the urban area of the city of Mascouche.
On the Christian origin, the place name is known since the beginning of the concession of the Seigneurie des Plaines, circa 1731. The settlers began clearing lots before 1740 along the St. Pierre River, which allowed a winter ice road before the development of roads along the river. 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". Joseph Bouchette map of 1831 indicates that stream "Riv. St Mary ", echoing the designation appearing in a confession and enumeration of Seigneurie de Terrebonne in 1736.[2]
The place name "Saint Pierre River" was formalized December 5, 1968, at the Bank of place names of Commission de toponymie du Québec (Quebec Geographical Names Board).[3]