Click here to see the different types of streams
The river stretches through 124 km long. It has its source in the Champlain lake ( USA ) and flows from the South to the North to join the St-Laurent river, that goes into the St-Pierre lake ( Quebec ). During its quebec part, the river Richelieu Catchment Area has 18 lakes and ponds.
Nowadays, we can navigate between the river St-Laurent and New York city thanks to the river Richelieu .
THE RIVER'S COURSE
The average slop of the river is 0,19 m/km, pour un débit de 330 m 3 .s -1 , so we can say its flow is three times more important than the one of the river Charente with a gentler slope.
It can be separated in three parts :
• The river Richelieu before St-Jean-sur-Richelieu
This part is almost flat : the slope is only of 0,3m for a 35 km length. Moreover, the river shrinks little by little, moving from 1,5 km wide to 250 m.
• Thje river in the Haut-Richelieu (from St-Jean to Chambly )
The river course is punctuated with rapids : its slope is 25 m for 12 km. Then the river Richelieu gets wider in the Chambly Basin .
• The river in the Bas-Richelieu (from Chambly to the St-Laurent)
In St-Ours, the river has a strong slope. It joins the St-Laurent river at the lavel of Sorel city.
CITIES ACROSS THE RIVER
THE CHAMPLAIN LAKE
The Champlain lake is the source of the river Richelieu, and it is mainly located on the New York state ( USA ), and its upper part is in Quebec . It is the sixth biggest water area of the USA : 1130 km², 180 km long for 19 km wide in its maximum, and 80 islands. Its water supplies 200 000 inhabitants in drinking water, that is to say 34 % of the catchment area population.
It is said that a marine monster, called Champie, lives in it. Nowadays, a lot of cruise boats and ferrys navigate on it, and there are fishing activities.
Click here to see the map of localisation of the Champlain lake
THE SAINT-LAURENT RIVER
This huge 1200 km long river has its source in the Big Lakes and flows into the Atlantic Ocean in the Saint-Laurent estuary. It has more than 100 affluents, and the river Richelieu is one of them.