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National Hydro Network (NHN) - 245 new watersheds (WS)

October 15, 2020

Summary : Publication of 245 NHN datasets including: 74 NHN-CL3 watersheds.

With the publication of these new watersheds, nearly 20% of watersheds covering Canada has been improved, allowing better analysis of hydrological networks.


  • 4 watersheds have been updated, using orthophotos and imagery (05OD000, 05OH001, 05OH002 and 05OG000)
  • 10 Canada/USA bi-national watersheds were regenerated
  • 74 watersheds have been improved into NHN-CL3
  • 8 watersheds were produced to correct anomalies.

Furthermore, in maintenance effort, 149 watersheds were re-generated following watershed limits redefinitions.

For more information about the Hydrographic Network Quality, please refer to the Completeness Level.

Publication map

This map shows the hydrographic watersheds affected by this release.

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