TheTawachiche River (French pronunciation: [tawaʃiʃ]) flows from north to south for 25 kilometres (16 mi) entirely in the territory of the Municipality of Lac-aux-Sables, in Mékinac Regional County Municipality, in Mauricie, in the province of Quebec, Canada.

The Tawachiche River watershed covers 196 square kilometres (76 sq mi) and is the ninth largest sub-watershed in the Batiscanie.

Although the river flows through agricultural areas, from about a mile above the village of Hervey-Jonction to its mouth, each bank maintains a wooded strip, of a width generally ranging from 50 to 100 meters.

Northeast of Hervey-Jonction, after passing under the bridge of the Route 153, the river flows through a beautiful waterfall cascades which inflates in March and April due to snowmelt.

Audy sector offers various services to visitors including a relay, lodging, rental cabins, camping, the docking station of the Zec Tawachiche, etc.

The main bridges over the Tawachiche river, from the mouth are:[3] • A bridge linking the St-Thomas North road (Sainte-Thècle) and Saint-Alphonse road (Lac-aux-Sables), is located at 0.5 km upstream of the mouth of Tawachiche river.

This second bridge spans a small river which becomes a tributary of the right bank of Tawachiche few hundred meters below.

• Road Bridge on Route 153 (chemin Saint-Charles), located at the northern end of the village of Hervey-Jonction (near golf course) or 5.5 km by water from the mouth (or 4 km in a direct line, because the sinuosity of the river Tawachiche).

Major dams in this sub-basin are: A saw mill, owned by the forester contractor Théotime Massicotte, living in Sainte-Thècle, was built between the railway and the river Tawachiche, less than a mile south of the small Audy railway station.

Founded in 1920 by four brothers Jeffrey, Freddy, Alphée and Wilson Veillet of Sainte-Thècle, Veillette & Brothers company Limited acquires rights of cutting hardwood, in 1922, in the north of Hervey-Jonction, in the area of Tawachiche river, around Audy, along the rail road leading to La Tuque.

From the beginning, the mill assured employment to 22 or 25 men assigned to sawing wood, the drave, the stacking and transportation, and also a hundred woodcutters in the forest.

The second sawmill of "Veillette & Frères Ltée" was built in the fall of 1933, on the right banks of the river Tawachiche, at 500 meters North of the village of Hervey-Jonction.

Then a slab brought the pitounes 75 feet higher to the docks of railway wagons (parked on side line).

The sawmill ceased its operations in 1941, as the wood was then transported by truck directly from seater cutting to paper mill in Grand-Mère or Shawinigan.

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