page_title: North Yamaska River
section_title: Hydrography
hierarchical_section_title: North Yamaska River / Geography / Hydrography
caption_attribution_description: Français&#160;: La rivière Yamaska à Granby après la fonte de la neige.
context_page_description: The North Yamaska river is a tributary of the Yamaska river. It flows over 47.8 kilometres on the south shore of the Saint Lawrence river in Quebec, Canada and passes through five municipalities, some of them sourcing their fresh water from it.
  Like the rest of the Yamaska, it is an important source of life, though urban development, agriculture and industrial uses have had a negative impact on the ecosystem depending on its waters since the colonization of the Eastern Townships.
  An awakening in regards to pollution in the North Yamaska has led to an increasing amount of movements such as collective art and eco-friendly action around the river; efforts are noted in local municipalities and their regional county municipalities to alter the impacts of towns and villages on water quality.
context_section_description: The drainage basin of this river covers 303 km2 and its average mass flow rate is of 0.59 m³/s, its mass flux increases and diminishes according to seasons. The North Yamaska river's source comes from Waterloo lake (lac Waterloo) (altitude: 204 m), located south of the village of Waterloo; its course forms an arc that goes around mont Shefford on the north side.
caption: North Yamaska river in the spring.
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