Watershed, Secondary

Note: this Watershed, Secondary data has been replaced by the Ontario Watershed Boundaries.

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

Watersheds are split into four categories:

  • primary
  • secondary
  • tertiary
  • quaternary

Secondary watersheds are subdivisions of primary watersheds in Ontario. Most secondary divisions are either large river systems or groupings of small coastal streams.

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
Source URL/Address
Author Email
Maintainer branch
Last Validated Date 2020-07-17
Update frequency Other
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