The lower part is served indirectly by the Tewkesbury road which passes on the east side of the Jacques-Cartier river.

[3] In addition, the hydrographic slope of the Cassian river includes 4.77 square kilometres (1.84 sq mi) 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 toponym "Cassian River" was formalized on December 5, 1968 at the Place Names Bank of the Commission de toponymie du Québec.