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
Maintainer branch
Digital, Data, Information and Business Services Branch
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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