The La Loutre dam (in French: Barrage La Loutre) is a river infrastructure downstream from the Gouin Dam. This dam is the second on the Saint-Maurice River from the source (Gouin Reservoir). It is located in the city of La Tuque, in Mauricie, in the province of Quebec, in Canada.
An island in diameter separates the two sections of the La Loutre dam.
The main hydrographic slopes near the La Loutre dam are:
The right-hand hose reel of the La Loutre dam is located at:
The La Loutre dam has two weirs: the one on the right (to the south) and the one on the left (to the north). The forest road crosses at the top of each of the two reels.
| Characteristics | Left dam | Right dam | |
|---|---|---|---|
| Height | 6.5 | 4.4 | |
| Holding capacity | 2,827,440 m3 | 900,000 m3 | |
| Height of the restraint | 4 m | 3.2 m | |
| Length of the book | 135 m | 50.1 m | |
| Type of dam | Earth | Concrete-gravity | |
| Type of land | Alluvium | Roc | |
| Class | E | E | |
| Consequence level | Minimal | Minimal | |
| Tank area | 142.7 ha | 142.7 ha | |
| Pushback length | 4200 m | 4000 m | |
| Average width | 287,500 m | 339.7 m | |
| Year of construction | 1930 | 1918 |
The project to harness the Saint-Maurice River at Rapides La Loutre became possible thanks to the construction of the second Transcontinental railway line which follows the course of the Saint-Maurice River between La Tuque and Wemotaci, except in the segment between the mouth of the Vermillon River (La Tuque) and the hamlet of Mactavish hamlet on the Reservoir Blanc where the railway line cuts short while the Saint-Maurice River makes a big curve towards the North-East. This line arrived at La Tuque in 1908 and Weymontachie in 1910.
Initially the Fraser Brace Company (of Berlin, New Hampshire, U.S. which will take the name of Brown Corporation in Canada) in charge of the construction works had planned to establish the center of construction operations of the La Loutre dam at Weymontachie on the north shore of the Saint-Maurice River; however, the Hudson's Bay Company refused access to their land citing the risk to the fur herds. Consequently, the general construction contractor set up his site operations center on the south shore of the Saint-Maurice by founding the forest village of "Sanmaur" in 1914. A wharf was built downstream of the Chaudière rapid. Boats were providing supplies between Sanmaur and the rapid Chaudière.[4] A dike was then built between Sanmaur and Weymontachie in order to raise the water level upstream, facilitating the transport by boats and barges of workers, machinery and equipment.
In addition, a section (the "RR track") has been built over the last leading to the construction site, either from the "Rapides de la Chaudière" where the Saint-Maurice River forms a loop towards east downstream of the mouth of the Petit Rocher River (La Tuque).
Before the construction of the La Loutre dam, the Saint-Maurice River originated at Du Mâle Lake (Gouin Reservoir). Downstream from this source, the former site of the Atikamekw village of Obedjiwan was swallowed up and moved higher up.[5]
This toponym originates from the Rapides La Loutre which the dam flooded.
The toponym "La Loutre dam" was formalized on June 6, 1973, at the Commission de toponymie du Québec.[6]