The Tamarac River is a tributary of Pain de Sucre Lake (La Tuque), flowing north of the St. Lawrence River, first in Senneterre (MRC of La Vallée-de-l'Or Regional County Municipality, in Abitibi-Témiscamingue and in the territory of La Tuque, in the administrative region of Mauricie, in Quebec, in Canada.
This stream runs entirely in a small valley in forest area.
The surface of the Tamarac River is generally frozen from the beginning of December until the beginning of April.
From the dam at the mouth of Tamarac Lake, the Tamarac River flows over 44.0 kilometres (27.3 mi), according to the following segments: Upper part of the river (segment of 21.5 kilometres (13.4 mi)) Lower part of the river (segment of 22.5 kilometres (14.0 mi)) The Tamarac River empties into Radisson Township on the west shore of the northern part of Sugarloaf Lake (La Tuque) which is the head lake of the Gatineau River; the latter then pours into the Ottawa River.
This confluence of the Tamarac River is located almost at the eastern limit of Radisson Township, at: The toponym "Tamarac River" was formalized on December 5, 1968 at the Commission de toponymie du Québec, when it was created.