| Rivière Cassian | |
| Pushpin Map: | Quebec |
| Subdivision Type1: | Country |
| Subdivision Name1: | Canada |
| Subdivision Type2: | Province |
| Subdivision Name2: | Quebec |
| Subdivision Type3: | Region |
| Subdivision Name3: | Capitale-Nationale |
| Subdivision Type4: | Regional County Municipality |
| Subdivision Name4: | La Jacques-Cartier Regional County Municipality |
| Length: | 28.5km (17.7miles) |
| Source1: | Monière Lake |
| Source1 Location: | Stoneham-et-Tewkesbury |
| Source1 Coordinates: | 46.9935°N -71.6144°W |
| Source1 Elevation: | 703 |
| Mouth: | Jacques-Cartier River |
| Mouth Location: | Saint-Gabriel-de-Valcartier |
| Mouth Coordinates: | 47.0239°N -71.4883°W |
| Mouth Elevation: | 180 m |
| Tributaries Left: | (Clockwise from the mouth) Décharge d'un lac non identifié, décharge du lac Chartré, décharge du lac des Bouleaux, décharge d'un ensemble de lacs (Richou, Demers, Bastien), décharge du lac Barré, du lac Dubois et du Petit lac Dubois. |
| Tributaries Right: | (Clockwise from the mouth) Décharge du lac Michel, décharge du lac Pageau et du Petit lac Pageau. |
The Cassian River is a tributary of the Jacques-Cartier River, flowing in the municipalities of Saint-Gabriel-de-Valcartier and Stoneham-et-Tewkesbury, in the La Jacques-Cartier Regional County Municipality, in the administrative region of Capitale-Nationale, in Quebec, Canada.
The Cassian River valley is served by secondary forest roads. The lower part is served indirectly by the Tewkesbury road which passes on the east side of the Jacques-Cartier river.[1]
Forestry is the main economic activity in the sector; recreational tourism, second. The Tantaré Ecological Reserve covers part of Cassian Lake. In addition, the hydrographic slope of the Cassian river includes in Jacques-Cartier National Park.
The surface of the Cassian River (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.
The main watersheds adjacent to the Cassian River are:
From the mouth of lake Monière the course of the river descends on according to the following segments:
The Cassian River flows onto the west bank of the Jacques-Cartier River. From this confluence, the current descends on generally towards the south following the course of the Jacques-Cartier River which flows on the northwest bank of the Saint-Laurent river.
The toponym "Cassian River" was formalized on December 5, 1968 at the Place Names Bank of the Commission de toponymie du Québec.[3]