The Tawachiche River () flows from north to south for entirely in the territory of the Municipality of Lac-aux-Sables, in Mékinac Regional County Municipality, in Mauricie, in the province of Quebec, Canada.

Geography

The Tawachiche River watershed covers and is the ninth largest sub-watershed in the Batiscanie..

River Tawachiche pass through a single village, Hervey-Jonction, then crosses Rang Saint-Charles and empties into the Batiscan River (which forms a sharp bend at this point), at the limit Sainte-Thècle and Lac-aux-Sables. Its main tributary, the Tawachiche West River, flows into Tawachiche river at about from its mouth (in Audy sector, at the boundary of Zec Tawachiche).

Upper water bodies

The "Lac à l'Orignal" (Moose Lake) (elevation: 379 m) is the upper lake of the Tawachiche River in the Marmier (township). This lake is fed from the north by a creek which starts at an unnamed lake (elevation: 420 m; heart shaped); this stream descends westward to "lac Petit" (Lake Petit) (elevation: 377 m; 140 m long and surrounded by marshes); then the stream branches off to the south and crosses four small lakes before flowing into marsh area on the shore north of "lac à l'Orignal" (Moose Lake).

From "lac à l'Orignal" (elevation: 379 m), the Tawachiche River flows south through lakes: Price (elevation: 375 m; in marsh area), "Petit lac Begin" (Small Begin lake) (elevation: 359 m), Bégin Lake (altitude 347 m), Germain Lake (elevation: 338 m), "Lac Profond" (Deep Lake) (elevation: 272 m) and the Terrien lake (altitude 263 m). This lake is the largest body of water in this river sub-catchment. From the discharge of the latter lake, the river flows south-west.

Down, the river quenches including lake "du Milieu" (Middle lake), Boiteau and Buffon. The Tawachiche river is also fed by the outlet of Fontaine lake.

While the Tawachiche West River is fed by lakes Masketsi, Little Masketsi and Roberge, located in the non organized territory of the Lac-Masketsi.

All the headwaters of the river is located in the Tawachiche Zec Tawachiche which is the main watershed. Lake Masketsi () is the largest lake in this sub-watershed (river Tawachiche) of the Regional Development Plan and Integrated Resource (PRDIRT).

Lower part

This watershed includes part of rang St-Georges (north) and rang St-Thomas (north) in Sainte-Thècle.

On nearly all the way, this river flows in forested areas. 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. The surface of the Tawachiche river is usually frozen from November to April, allowing the construction of roads ice for transport to the lumber camps before the construction of a motorable road on the side of the river. This ice road was used greatly during the Indian prehistory and pioneers in the settlement.

Road and railway course From the village of Hervey-Jonction, going back to the north, the "Lac-en-Coeur" road (Road of lake in form of Heart) leads directly to the lake of the same name (located 2.0 km from Hervey-Jonction). Then the road turns to the right (north) at 1.6 km from Hervey-Jonction and becomes the Tawachiche road, which crosses the railway line Hervey-Jonction – La Tuque (at 1.7 km from the intersection of "Lac-en-coeur" Road). Shortly after crossing the railway, the road crosses Tawachiche river. Then the railway and the Tawachiche road follow a similar path up towards the north near the Tawachiche river.

In sector Audy (near the mouth of the Tawachiche West River), the railway forks (9.1 km from Hervey-Jonction) to the north-west, parallel to the path of the Tawachiche West River. All the way from Hervey-Jonction, the railway stay on the right bank of the Tawachiche West River and Tawachiche river. And 20.6 km from Hervey-Jonction, the railway skirts the "petit lac Masketsi" by the northeast, continues along the Lake Masketsi along its length (east side), and passes through sector Gouin, located on the lake. At some points, the journey by rail area encroaches on the lake.

Several cottages are built surrounding the Tawachiche river, including several in the Audy (which has several small streets), the area of the falls in the village of Hervey-Jonction, and in the area between Hervey-Jonction and the mouth of the river. Audy sector offers various services to visitors including a relay, lodging, rental cabins, camping, the docking station of the Zec Tawachiche, etc.

Major bridges The main bridges over the Tawachiche river, from the mouth are:Historical Research conducted in 2013 by the historian Gaétan Veillette (Saint-Hubert) using the Google Map website.

• 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 bridge is close to a second bridge (located a few hundred metres southeast of the first). This second bridge spans a small river which becomes a tributary of the right bank of Tawachiche few hundred meters below. The road from St Georges Road (Lac-aux-Sables) ends between the two bridges. This area is designated Pee-Wee.

• 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). This bridge is located upstream of a large drop, which is located near the site of the second station- Hervey-Jonction. The new railway station is now located in front of the chapelle of the village.

• Bridge Railway of the Canadian National (formerly Grand Trunk Railway), on the railway line between Hervey-Jonction and Lac Saint-Jean. The iron bridge is located 0.4 km upstream of the bridge on Route 153.

• Pedestrian Bridge in the second sawmill Veillette & Frères Ltée, built 500 meters north of Hervey-Jonction, upstream of the railway bridge. This mill was built in the fall of 1933 and was operated until 1941. It was demolished in 1946.Article "The businessman Jeffrey Veillette (1881-1946) of Lac-aux-Sables led to 6,000 forestry workers" by Gaétan Veillette (Saint-Hubert) with collaboration with Armand Veillet (Saint-Jean-sur-Richelieu). Researchers: Lorenzo Martel (Hervey-Jonction) and Clément Veillette (Hervey-Jonction). Article published in the bulletin "The Pathiskan", March 1994. The article discusses the second sawmill (1933-1941) in Hervey-Jonction.

• First road bridge Tawachiche the way, leading to the docking station (sector Audy) of Zec Tawachiche. This bridge is located 1.8 km from the intersection of "Lac en coeur" road. After the bridge, the road up the river on the left bank.

• Second Tawachiche Road flyover, located 5.9 km from the intersection of "Route du lac en coeur", leading to the docking station (sector Audy) of Zec Tawachiche. After the bridge, the road up the river on the right bank.

• Third Path Tawachiche road bridge in the Audy (Audy near the station), 7 km from the intersection of "Lac en coeur" road. The bridge spans the Tawachiche West River, the main tributary of the river Tawachiche. Before crossing the bridge, the path splits into two Tawachiche branches Tawachiche the road which runs west to Lake Masketsi (north-west) on the right bank of the river and the road Tawachiche East, which continues north-east up the river Tawachiche on the right side for a few miles.

• Fourth Road Bridge Tawachiche Road East, built near Lake Pollack, approximately 2.3 km upstream of the bridge of Tawachiche West River. After crossing the bridge, the path Tawachiche East goes north-east on the left bank.

Main Basin dams The first dams built at the mouth of Lake watershed rivers Tawachiche, Tawachiche Tawachiche West and East, served from 1933 to regularize the flow (especially during floods) and the water level in order to promote timber transport by flotation. Since the 1950s, dams lakes at the mouth promote water activities. Major dams in this sub-basin are:

+ Main dams on watershed of river Tawachiche-West Dam Distance of Audy's railway station Longitude Latitude Notes Calau km -72.499380303° 47.039225725°located at 0.4 km from Welch lake Suève-1 km -72.491324102° 47.045336775°located at the mouth of Suève lake. Suève-2 km -72.491324102° 47.045336775°located at 0,2 km from Suève-1 dam, at the mouth of Suève lake. Petit-Lac-Masketsi km -72.53611 46.97194 located at the mouth of "Petit lac Masketsi" (Little Masketsi lake). This dam belongs to Quebec gouvernement. The "petit lac Masketsi" empties into river Tawachiche-West.Commission de toponymie du Québec. Lac Masketsi km -72.55417 46.99944 This dam was built at the mouth of Masketsi lake in Fall 1933 by Veillette & Frères Ltée in order to regulate the water flow for the first Tawachiche sawmill. Now, this dam is owned by the Quebec government. The outlet of Lake Masketsi is located on the route of the river Tawachiche-West. Native Masketsi designation means "moccasin".Commission de toponymie du Québec.

Saw Mill "Veillette & Frères" at Audy 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. The saw mill was approximately eight kilometers north of the village of Hervey-Jonction.Article « Plan du site du moulin à scie de Veillette & Frères Limitée au Lac du Jésuite à Sainte-Thècle» (Plan of the site of Veillet& Brothers Ltd in Lac-du-Jésuite in Sainte-Thècle), Armand Veillet (Saint-Jean-sur-Richelieu) et Gaétan Veillette (Saint-Hubert), bulletin Le Pathiskan, Association des Veillet/te d'Amérique, December 1994, p. 17 à 20. This mill was sold to Frank Blais, forest contractor and merchant living in Sainte-Thècle, who had operated a store in the early 20th century at the village the station (Notre-Dame street), Sainte-Thècle.Article "Le développement des routes à Sainte-Thècle" (The development of roads in [Sainte-Thècle)," by René Veillette, published in The Journal The Dynamics (weekly newspaper published in Saint-Tite) of April 25th 1973 In 1922, Frank Blais sells this small sawmill in Audy, powered by steam, to the company "Veillet & Frères Ltée" (Veillet & Brothers Ltd). The company made minor additions to this mill.

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.

This mill was operated about 16 years until about 1934. 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. Contracts cutting wood in the forest were usually granted to designated contractors including: Wellie Charest, Armand Plamondon, Josaphat Veillet and Bruno Veillet.

Depending on demand, the wood was sawn into planks, boards, wooden construction, railway sleepers, or boards (1.25 inch to 2.5 inch) for the textile manufacturers which were transformed into spindles.