Lake Diefenbaker Irrigation Expansion Projects

The Saskatchewan Water Security Agency is proposing to construct and operate irrigation projects surrounding Lake Diefenbaker, Saskatchewan. The Lake Diefenbaker Irrigation Expansion Projects would be completed in three separate phases and would dig about 500 km of canals, build four balancing reservoirs and an outfall structure into Buffalo Pound Lake. The proposed infrastructure would irrigate of up to 186,155 hectares (460,000 acres) of land and provide water for other uses. Phases 1 and 2 would take place northwest of Lake Diefenbaker and would complete the Westside Irrigation Canal System while Phase 3 is the development of the Qu'Appelle South Irrigation System to the south of Lake Diefenbaker.

Latest update

November 4, 2021 — The Minister of Environment and Climate Change has determined that the Lake Diefenbaker Rehabilitation Project and the Expansion Project do not warrant designation at this time under the Impact Assessment Act. The reasons are provided in his response.


Key documents

Key documents
Document Number Document Title File Date
3 Analysis Report PDF (1.2 MB) November 4, 2021
2 Minister's Response - November 4, 2021
1 Request for Designation of Project PDF (1.2 MB) June 16, 2021


Lake Diefenbaker Irrigation Expansion Projects
Impact Assessment Agency of Canada
Canada Place
9700 Jasper Avenue, Suite 1145
Edmonton, Alberta T5J 4C3
Telephone: 780-495-2037
Fax: 780-495-2876

  • Location

    • Lake Diefenbaker (Saskatchewan)
  • Nature of Activity

    • Water Management
  • Assessment Status

  • Proponent

    Saskatchewan Water Security Agency
  • Authorities

    • Impact Assessment Agency of Canada
  • Assessment Type

    Assessment not applicable
  • Reference Number


This map is for illustrative purposes. The markers represent the approximate locations based on available data. More than one marker may be identified for a given assessment.


Nearby assessments

...within 200 kilometres
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