The Mékinac Lake is a large lake of freshwater of province of Quebec (Canada), located mainly in the municipality Trois-Rives, in Mekinac Regional County Municipality, in the administrative region of Mauricie, in the province of Quebec, in Canada.

The northern part of the lake and the bottom of the Bigué Bay (to the west) are within the La Tuque (urban agglomeration).

After this town, turn left onto "Chemin du lac Mékinac" (Lake Mekinac Road).

[3] A peninsula in the middle of Lake Mekinac, on East bank (in the municipality of Trois-Rives) is designated the "Trou-du-Steamboat".

The name of this place is associated with a boat powered by a steam engine (commonly called "steamboat") who found refuge regularly in the large bay of "Bras Grosleau" when the lake became too agitated.

The steam boat was carrying forestry workers and goods to supply the logging camps established around the lake.