Quaternary watershed boundaries

Note: this Watershed, Quaternary data has been replaced by the Ontario Watershed Boundaries.

A watershed, also known as a catchment basin, includes all of the land that is drained by a watercourse and its tributaries.

Watersheds are split into 4 categories:

  • primary
  • secondary
  • tertiary
  • quaternary

Quaternary watersheds are subdivisions of tertiary watersheds.

These divisions are based on the federal framework originally known as the Water Resources Index Inventory Filing System.


Ontario's Open Data Team opengov@ontario.ca


Data Available

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Covers 2010-01-01 - 2020-07-02

Supporting Files

Additional Info

Field Value
Geographic coverage Ontario
Geography Breakdown None
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Author Email
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Last Validated Date 2020-07-17
Update frequency As required
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