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  • Info line for new patients:


    Constance Lake

    5 Amik Street,  PO Box 81, Constance Lake, Ontario P0L 1B0


    Phone: 705-463-2121
    Fax: 705-463-2128


    Info line for new patients: 1-877-937-2282

    French Speaking physician is available.


    Office hours

    As part of the Canadian Addiction Treatment Centres clinic network, you can find OATC Constance Lake’s up-to-date hours here.

    Calstock is located in northern Ontario, in the township of Studholme in Cochrane District. It is a few kilometres north of Hwy 11, at the northern terminus of Highway 663, just south of the Constance Lake First Nation Reserve and about 30 minutes west of Hearst, Ontario.