The river surface is generally frozen from mid-December to the end of March.

Safe traffic on the ice is generally from late December to early March.

This lake is located west of "lac des îles" in Frontenac National Park (at the western limit).

Triangular in shape and 2.4 kilometres (1.5 mi) in length, this lake is surrounded by mountains.

The toponym "Bernier river" was formalized on December 5, 1968 at the Commission de toponymie du Québec.