I am researching streams and I want to select 1st-3rd order streams in North America. The NHD Plus V2 Flowline Network contains stream order (Strahler) in the packaged data and I was wondering if stream order has been calculated in the same fashion for Canada. I have downloaded the 50k NHN data for each Canadian province, but I have not seen stream order in the data anywhere. I would like to avoid having to calculate stream orders for the entirety of Canada on my personal PC. Has anyone ever seen a data set like that for Canada?

  • If it’s open data that you seek then I think the place to ask is the Open Data Stack Exchange.
    – PolyGeo
    Feb 10, 2022 at 11:48
  • If you do decide to compute it, check out RivEX for ArcMap.
    – Hornbydd
    Aug 23, 2022 at 22:28

1 Answer 1


In Ontario, at least, this data is maintained by each (most?) Conservation Authority, each of which is responsible for one major watershed. For instance, the Rideau Valley Conservation Authority has it at https://gis.rvca.ca/server/rest/services/RVCA_Hydrology_Service/MapServer/0 (layer name RVCA_Streamorder). The adjacent Mississippi Valley Conservation Authority also has it on its ArcGis server endpoint somewhere, as have many others (these are the ones relevant for me).

I am not aware of a Province-wide, much less pan-Canadian, dataset.

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