Ontario Watershed Boundaries

This collection represents the authoritative watershed boundaries for Ontario. The data is based on a framework similar to the Atlas of Canada Fundamental Drainage Areas and the United States Watershed Boundary Dataset, however it adopts a more stringent scientific approach to watershed delineation.

The Ontario Watershed Boundaries (OWB) collection includes five data classes:

  • OWB main: all levels from primary to quaternary and 5th and 6th levels in select areas
  • OWB primary: all primary watersheds or major drainage areas in the Canadian classification
  • OWB secondary: all secondary watersheds or sub drainage areas
  • OWB tertiary: all tertiary watersheds or sub sub drainage areas
  • OWB quaternary: all quaternary watersheds or 6-digit drainage areas.

The OWB data replaces the following data classes:

Ministry contact: pmu@ontario.ca

Additional information

Tags
Geographic coverage
Ontario
Last Validated Date
May 19, 2021
Update frequency
As required

Ontario Watershed Boundaries

Learn more about accessing data using different formats.

Date range: January 18, 2013 - June 4, 2020

  • Other
    Ontario Watershed Boundaries English

    Last Updated: July 27, 2020

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  • Other
    Limites des bassins versants de l'Ontario French

    Last Updated: July 27, 2020

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