L'Assomption River

From Wikipedia, the free encyclopedia
Jump to: navigation, search
L'Assomption River
Rivière L'Assomption
Rivière l'Assomption (Saint-Jean-de-Matha) 2005-08-22.jpg
Country Canada
Province Quebec
Region Lanaudière
Source Lac de l'Assomption (fr)
 - location Saint-Guillaume-Nord
 - coordinates 46°27′45″N 74°03′16″W / 46.46250°N 74.05444°W / 46.46250; -74.05444
Mouth Rivière des Prairies
 - location Repentigny
 - coordinates 45°42′52″N 73°28′51″W / 45.71444°N 73.48083°W / 45.71444; -73.48083Coordinates: 45°42′52″N 73°28′51″W / 45.71444°N 73.48083°W / 45.71444; -73.48083
Length 200 km (120 mi)
L'AssomptionRiverMap.png

The Assomption River (in French Rivière l'Assomption, named after the Assumption of Mary) is the most important waterway in the Lanaudière region of Quebec, Canada, is over 200 kilometres (120 mi) long, and has a drainage basin of 4,220 square kilometres (1,630 sq mi). Its source is the Mont Tremblant massif. Seven significant rivers flow into the Assomption (de la Boule, Versailles, Noire, la Chaloupe, Ouareau, Saint-Esprit, and Achigan) before it flows into the Rivière des Prairies at Repentigny, Quebec.

About 150,000 people live in the drainage area of this river.

Geography[edit]

The L'Assomption River watershed overlaps two natural environments, the Laurentian Mountains and the St-Lawrence lowlands, which cover about a third of the watershed area. Its relief is a uniform plain with some hills—from 0 to 100 metres (0 to 328 ft)—dominated by agricultural lands. The texture of the soil is rather fine and rests on an impermeable argillaceous (clay) base.

The Laurentian Mountains form part of the Canadian Shield. They are separated from the lowlands by a well defined escarpment that rises about 150 metres (490 ft). This escarpment has many waterfalls. The Laurentians Mountains have an average height of 230 metres (750 ft) in the south and 460 metres (1,510 ft) in the north. And there are even mountains of over 600 metres (2,000 ft) in the Mont Tremblant massif where the L'Assomption River forms.

Hydrography[edit]

From north to south the average slope of the river decreases. The steeper slopes of the highlands create a fast current whereas the lowland flats produces a slower flow. Moreover, the river meanders a lot which is especially evident at the town of L'Assomption, almost completely surrounded by a large loop of the river.

The L'Assomption River watershed has 490 lakes of which 24 have a surface area larger than 1 square kilometre (250 acres). Most of the lakes are in the Laurentian highlands.

Water quality[edit]

Urban and industrial pollution[edit]

The water quality of the L'Assomption River is seriously affected by the area's social-economic conditions. Since 1950, the situation has been complicated by the urbanization of the river banks, by diversified agriculture, and by industrialisation along the southern portion of the river. Although the source of pollution has changed since 1950, because of strict environmental laws and the use of water purification equipment, water pollution is still not fully curbed.

Over 150,000 people live in the river's watershed in 43 municipalities, of which the most important are Repentigny, Joliette, Le Gardeur, and L'Assomption. In addition, the northern portion of the river's watershed is a popular vacation area, swelling the population by about 45,000 people during the vacation season.

The majority of the municipalities take their drinking water from the river and provide it to more than 100,000 people. The drinking water supply to other residences and country cottages, distributed over approximately 90 percent of the watershed area, comes from water wells.

Agricultural pollution[edit]

Besides the urban and industrial pollution, agricultural pollution also contributes greatly to the environment's contamination.

Agriculture has a dominant position along the river: in 1995 there were 1,305 producers with 60,221 hectares (148,810 acres) under cultivation and possessing 73,563 animals.

Agricultural pollution takes several forms: direct pollution (discharge of manure directly in the rivers) and diffused pollution (infiltration of fertilizer products in the groundwater). Diffused pollution is difficult to control because it has a multitude of sources throughout the whole region. Yet without a solution to this problem the water quality of the river will never have the desired quality.

Drainage basin watercourses[edit]

Order[1] Label Mouth Coordinates Length (km) Source Coordinates Region
1 L'Assomption River Rivière des Prairies 45°42′52″N 73°28′51″W / 45.71444444°N 73.48083333°W / 45.71444444; -73.48083333 200 L'Assomption Lake (fr) 46°27′45″N 74°03′16″W / 46.4625°N 74.054444°W / 46.4625; -74.054444 Lanaudière
2 L'Achigan River (fr) L'Assomption River 45°50′26″N 73°26′45″W / 45.84055°N 73.44583°W / 45.84055; -73.44583 83.8 L'Achigan Lake (fr) 45°55′26″N 73°57′03″W / 45.923988°N 73.950733°W / 45.923988; -73.950733 Lanaudière
3 Jourdain River (fr) L'Achigan River (fr) 45°49′54″N 73°51′31″W / 45.831666666667°N 73.858611111111°W / 45.831666666667; -73.858611111111 19.4 Duquette Lake 45°50′51″N 73°59′11″W / 45.847596°N 73.986294°W / 45.847596; -73.986294 Laurentides
4 Abercromby River (fr) L'Achigan River (fr) 45°51′44″N 73°53′12″W / 45.862222222222°N 73.886666666667°W / 45.862222222222; -73.886666666667 10.8 Connely Lake 45°53′26″N 73°58′00″W / 45.890648°N 73.96662°W / 45.890648; -73.96662 Laurentides
5 Beauport River (fr) L'Achigan River (fr) 45°53′23″N 73°52′08″W / 45.889722222222°N 73.868888888889°W / 45.889722222222; -73.868888888889 20 Lac de la Crosse 46°00′46″N 73°52′21″W / 46.012824°N 73.872441°W / 46.012824; -73.872441 Laurentides
6 La Petite Rivière (fr) L'Achigan River (fr) 45°51′03″N 73°46′17″W / 45.850833333333°N 73.771388888889°W / 45.850833333333; -73.771388888889 13 Saint-Calixte 45°51′03″N 73°46′17″W / 45.850909°N 73.771444°W / 45.850909; -73.771444 Laurentides
7 Saint-Esprit River (fr) L'Assomption River 45°51′41″N 73°26′35″W / 45.861388888889°N 73.443055555556°W / 45.861388888889; -73.443055555556 90.4 Huard Lake 46°00′50″N 73°48′44″W / 46.014012°N 73.812306°W / 46.014012; -73.812306 Lanaudière
8 Saint-George Creek (fr) L'Assomption River 45°54′13″N 73°26′13″W / 45.9035°N 73.437°W / 45.9035; -73.437 19.2 Saint-Alexis 45°54′13″N 73°26′13″W / 45.9035°N 73.437°W / 45.9035; -73.437 Lanaudière
9 Ouareau River (fr) L'Assomption River 45°56′24″N 73°24′27″W / 45.94°N 73.4075°W / 45.94; -73.4075 80 Ouareau Lake (fr) 46°17′03″N 74°08′35″W / 46.28416°N 74.14306°W / 46.28416; -74.14306 Lanaudière
10 Burton River (fr) Ouareau River (fr) 46°04′26″N 73°50′47″W / 46.073888888889°N 73.846388888889°W / 46.073888888889; -73.846388888889 16.9 Racette Lake 46°04′52″N 73°59′58″W / 46.08123°N 73.999314°W / 46.08123; -73.999314 Lanaudière
Laurentides
11 Jean-Venne River (fr) Ouareau River (fr) 46°06′08″N 73°51′27″W / 46.102222222222°N 73.8575°W / 46.102222222222; -73.8575 20.9 Lac des Îles 46°06′45″N 74°01′13″W / 46.112507°N 74.020144°W / 46.112507; -74.020144 Lanaudière
12 Kenny River (fr) Jean-Venne River (fr) 46°07′42″N 73°56′17″W / 46.128333333333°N 73.938055555556°W / 46.128333333333; -73.938055555556 10.4 Heroux Lake 46°10′02″N 73°59′33″W / 46.167139°N 73.992382°W / 46.167139; -73.992382 Lanaudière
13 Beaulne River (fr) Ouareau River (fr) 46°12′14″N 73°54′05″W / 46.203888888889°N 73.901388888889°W / 46.203888888889; -73.901388888889 9.2 Beaulne Lake 46°11′37″N 74°00′13″W / 46.193574°N 74.003582°W / 46.193574; -74.003582 Lanaudière
14 Dufresne River (fr) Ouareau River (fr) 46°15′55″N 73°59′16″W / 46.265277777778°N 73.987777777778°W / 46.265277777778; -73.987777777778 29.6 Dufresne Lake 46°12′09″N 74°13′13″W / 46.202595°N 74.220213°W / 46.202595; -74.220213 Lanaudière
Laurentides
15 Rouge River (fr) Ouareau River (fr) 45°58′35″N 73°28′34″W / 45.976388888889°N 73.476111111111°W / 45.976388888889; -73.476111111111 56.5 Couture Lake 46°10′19″N 73°46′53″W / 46.172008°N 73.781444°W / 46.172008; -73.781444 Lanaudière
16 Blanche River (fr) Rouge River (fr) 46°01′43″N 73°37′48″W / 46.028611111111°N 73.63°W / 46.028611111111; -73.63 17.8 Lac des Français (fr) 46°08′17″N 73°37′15″W / 46.138178°N 73.620824°W / 46.138178; -73.620824 Lanaudière
17 Le Grand Ruisseau (fr) Rouge River (fr) 46°01′05″N 73°32′39″W / 46.018055555556°N 73.544166666667°W / 46.018055555556; -73.544166666667 15.1 Sainte-Mélanie 46°08′52″N 73°32′06″W / 46.147722°N 73.534946°W / 46.147722; -73.534946 Lanaudière
18 Trudel River (fr) Ouareau River (fr) 46°07′11″N 73°51′00″W / 46.119722222222°N 73.85°W / 46.119722222222; -73.85 7.6 Chertsey Lake 46°07′56″N 73°48′52″W / 46.132314°N 73.814338°W / 46.132314; -73.814338 Lanaudière
19 Nord River (fr) Ouareau River (fr) 46°11′46″N 73°53′30″W / 46.196111111111°N 73.891666666667°W / 46.196111111111; -73.891666666667 6.5 Lac du Pin Rouge 46°14′22″N 73°52′57″W / 46.239342°N 73.882407°W / 46.239342; -73.882407 Lanaudière
20 Versailles River (fr) L'Assomption River 46°16′47″N 73°47′26″W / 46.279722222222°N 73.790555555556°W / 46.279722222222; -73.790555555556 12.5 spring 46°15′22″N 73°53′56″W / 46.256063°N 73.898856°W / 46.256063; -73.898856 Lanaudière
21 Grande rivière Swaggin (fr) L'Assomption River 46°19′16″N 73°50′31″W / 46.321111111111°N 73.841944444444°W / 46.321111111111; -73.841944444444 8.7 Lac des Cèdres 46°18′35″N 73°56′23″W / 46.309754°N 73.939661°W / 46.309754; -73.939661 Lanaudière
22 Petite rivière Swaggin (fr) Grande rivière Swaggin (fr) 46°19′07″N 73°51′27″W / 46.318611111111°N 73.8575°W / 46.318611111111; -73.8575 12.6 Vauvert Lake 46°22′40″N 73°58′03″W / 46.377806°N 73.967532°W / 46.377806; -73.967532 Lanaudière
23 McGee River (fr) L'Assomption River 46°22′13″N 73°52′54″W / 46.370277777778°N 73.881666666667°W / 46.370277777778; -73.881666666667 14.4 Marguerite Lake 46°23′58″N 74°03′24″W / 46.399481°N 74.056659°W / 46.399481; -74.056659 Lanaudière
24 Lavigne River (fr) L'Assomption River 46°23′02″N 73°53′50″W / 46.383888888889°N 73.897222222222°W / 46.383888888889; -73.897222222222 16.9 St-Amour Lake 46°30′42″N 73°54′53″W / 46.511624°N 73.914802°W / 46.511624; -73.914802 Lanaudière
25 Rivière de la Boule (fr) L'Assomption River 46°16′23″N 73°45′29″W / 46.273055555556°N 73.758055555556°W / 46.273055555556; -73.758055555556 14.7 Laré Lake 46°22′34″N 73°46′51″W / 46.375985°N 73.780914°W / 46.375985; -73.780914 Lanaudière
26 Noire River, Matawinie (fr) L'Assomption River 46°12′23″N 73°33′44″W / 46.206388888889°N 73.562222222222°W / 46.206388888889; -73.562222222222 52.6 Lemieux Lake 46°32′47″N 73°45′12″W / 46.54639°N 73.75333°W / 46.54639; -73.75333 Lanaudière
27 Blanche River Noire River, Matawinie (fr) 46°14′53″N 73°35′02″W / 46.248055555556°N 73.583888888889°W / 46.248055555556; -73.583888888889 10.8 Lac à Canards 46°15′15″N 73°40′51″W / 46.254216°N 73.680872°W / 46.254216; -73.680872 Lanaudière
28 Leprohon River (fr) Noire River, Matawinie (fr) 46°19′29″N 73°38′18″W / 46.324722222222°N 73.638333333333°W / 46.324722222222; -73.638333333333 16 small lake 46°20′57″N 73°44′09″W / 46.349062°N 73.735735°W / 46.349062; -73.735735 Lanaudière
29 Crique à David (fr) Noire River, Matawinie (fr) 46°18′51″N 73°29′04″W / 46.314136°N 73.484489°W / 46.314136; -73.484489 17 Lac à la Pluie 46°25′12″N 73°38′01″W / 46.420118°N 73.633728°W / 46.420118; -73.633728 Lanaudière
30 Ruisseau du Point du Jour (fr) L'Assomption River 45°50′12″N 73°24′56″W / 45.836666666667°N 73.415555555556°W / 45.836666666667; -73.415555555556 20.6 Lanoraie 45°59′14″N 73°18′37″W / 45.987099°N 73.310163°W / 45.987099; -73.310163 Lanaudière

List of towns crossed[edit]

The large meander of the L'Assomption River at the Town of L'Assomption

References[edit]

  1. ^ Ordered by right to left confluence.

External links[edit]