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The Rivière des Roches is a tributary of the northwest shore of the Saint Lawrence river, flowing in the municipality of Saint-Augustin-de-Desmaures, in the Portneuf Regional County Municipality, in the administrative region of Capitale-Nationale, in the province of Quebec, in Canada.

Rivière des Roches
Location
CountryCanada
ProvinceQuebec
RegionCapitale-Nationale
Regional County MunicipalityPortneuf Regional County Municipality
MunicipalitySaint-Augustin-de-Desmaures
Physical characteristics
SourceForest stream
  locationSaint-Augustin-de-Desmaures
  coordinates46.74931°N 71.54648°W / 46.74931; -71.54648
  elevation117
MouthSaint Lawrence river
  location
Saint-Augustin-de-Desmaures
  coordinates
46.72083°N 71.49861°W / 46.72083; -71.49861
  elevation
4 m
Length9.6 km (6.0 mi)
Basin features
Tributaries 
  leftUnidentified stream
  rightRuisseau Dorval

The Roches river valley is mainly served by the route 138, chemin du Roy, chemin du 3e rang and chemin du Cabouron, notably for the needs of agriculture and of forestry, are the two main economic activities in this area.[1]

The surface of the Rivière des Roches (except the rapids areas) is generally frozen from the beginning of December to the end of March; safe circulation on the ice is generally done from the end of December to the beginning of March. The water level of the river varies with the seasons and the precipitation; the spring flood occurs in March or April.


Geography


The Roches river has its source in a forest area in Saint-Augustin-de-Desmaures, almost at the limit of Neuville, north of the village of Saint-Nicolas.[2] This source is located 0.2 kilometres (0.12 mi) north of the Canadian National railway, 8.0 kilometres (5.0 mi) west of the village center of Saint-Augustin-de- Desmaures, 1.3 kilometres (0.81 mi) northwest of autoroute 400, 4.6 kilometres (2.9 mi) northwest of the Saint Lawrence river, 5.9 kilometres (3.7 mi) northwest of its mouth.

From its source, the Roches river then flows over a distance of 9.6 kilometres (6.0 mi), with a drop in level of 13 metres (43 ft), according to the following segments:

The confluence of the Roches river and the Saint-Laurent river flows into the Saint-Laurent downstream of the Dombourg islets. This confluence is located 16.1 kilometres (10.0 mi) southwest of the Pierre Laporte Bridge, 3.4 kilometres (2.1 mi) southwest of the center of Saint-Augustin-de-Desmaures.[2]


Toponymy


The toponym "Rivière des Roches" originates from the habit of residents of the area to designate it because of its rocky bed, just like sixty other similar entities across Quebec. It has also been known under the names Ruisseau Dorval and Rivière des Rouches. It is from this that the Desroches family, whose ancestor was called Tinon, then Tinon Des Roches, took its nickname.

The toponym "Rivière des Roches" was formalized on December 5, 1968 at the Commission de toponymie du Québec.[2]


Notes and references



Appendices


Map all coordinates using: OpenStreetMap 
Download coordinates as: KML





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