Magog River

The Magog River, or Sekosonotek in Abenaki, is a river that drains Lake Memphremagog. It is a small river running through the territories of the cities of Magog and Sherbrooke, in the administrative region of Estrie, in Quebec, in Canada, along a southwest–northeast axis. Having its source in lake Memphremagog, it crosses lake Magog and empties into Saint-François River, in the city center of Sherbrooke.

The cities of Sherbrooke and Magog, Quebec, lie on the Magog River.

Engineers from the Université de Sherbrooke have constructed a plastic bridge on the river.

Geography
The Magog course begins in the city center of the municipality of the same name. This departure, located at 208 m of altitude, constitutes the only spillway of lake Memphremagog, the Magog river drawing its source via the various tributaries of this large lake, until beyond the country's border to United States. Thus, including in particular the collection areas of the various small rivers that will follow its course, the Magog hydrographic basin covers an approximate area of 1900 km².

At the first kilometer and a half of its route, there is a first dam, named Memphrémagog, followed by the collection of a first stream (km 4.1), named the Red stream. Downstream from this, a second dam (km 5.6), named La Grande-Dame is then interposed, then the river ends in the lake Magog (km 9.8).

At the level of this 6.5 km long lake, the body of water receives brook Noir at its southern end and Red Brook at its northern end. The Magog River then resumes its normal course via a small interstice at the northeastern end of the lake (km 16.3).

The river continues its route collecting water from the Grass Island stream (km 18.5), Gordon (km 19.4) streams, before being interrupted again by the presence of Rock Forest dam (km 19.6). Subsequently, the Magog collects water from the streams Nick (km 21.5) Dodds (km 23), reaches the Drummond dam (km 25), before widening to form lac des Nations (km 29.1), in the heart of Sherbrooke.

The river then plunges into a deep gorge, beyond the Paton dam (km 30.4), with a declination of 38 m, over a distance of approximately 1.3 km, overlapping at the same time two other dams (Frontenac, 30.9 and Abénaquis, 31.4), before finishing its course in the Saint-François River, at 141 m of altitude.

The total length of the river, including the portion of lac Magog, is therefore 31.8 km, on a drop of 67 m and flows mainly along an axis south-west, north-east.

Toponymy
The Abenakis designate this watercourse under the name of: "Pskasewantekw" or "Pskusewantegw", meaning "the river which makes detours".

The toponym "rivière Magog" was made official on December 5, 1968 at the Commission de toponymie du Québec.

History
Its source, located at 208 meters of altitude and its confluence, being at 141 meters of altitude, give it a significant drop, considering its 31.8 km in length. The flow of the river at its exit from Lake Memphremagog passed through a natural channel between 92 and 150 meters wide; the current was rapid to Seaswaninepus lake at a distance of approximately 13 km downstream. This lake had a length of 8 km, then the great falls (Greats Falls), fell at a distance of 800 meters before the Forks (The Fork) avec la rivière St-François. The region was mapped by Joseph Blanchard in 1756. The significant drop allowed the construction of seven dams, three of which in the last 1200 m meters, even a gorge carved out by the river, in the heart of Sherbrooke. One of them, that of the Paton Co. created the Lac des Nations, a water basin formerly intended to provide leeway during low-water periods, in order to allow the continuous functioning of industrial companies, which used the hydraulic power of the river.

Due to its regular flow and its significant variation, it was the scene of various industrial activities, particularly in Sherbrooke and Magog, in the 19th and 20th century. Today, its banks are mainly occupied by private residences, by linear parks, or by a few areas still wooded, industrial activities having almost all disappeared.