Lake Manitoba and Lake St. Martin Outlet Channels

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Why This Project Was Started

In 2011, southern Manitoba experienced widespread flooding and Lake Manitoba experienced high inflows through the Waterhen River, Whitemud River, and the Portage Diversion. This outlet project is intended to improve water regulation and reduce the likelihood of flooding on both Lake Manitoba and Lake St. Martin.

Environmental Assessment

Before construction on the Lake Manitoba and Lake St. Martin outlet channels can begin, an Environmental Assessment (EA) is required by federal and provincial law. An EA is a comprehensive review that looks at input from many different sources to predict how it will affect the environment. These inputs include:

  • Public input from open houses and online consultations
  • Consultations with Indigenous communities and groups
  • Regulatory input from federal and provincial offices
  • Field studies, including heritage and environmental
  • Technical input, including consultants, studies and previous experience

Background Information

Where We’re At Now

The Impact Assessment Agency of Canada (Agency) and Manitoba Conservation and Climate (MCC) now reviews the Environmental Impact Statement (EIS) and all feedback. The Agency will draft an Environmental Assessment report that will be available for public comment. MCC prepares the Environment Act Licence which will be shared internally with other Manitoba government departments for their feedback.

Share Your Views

Manitoba Infrastructure would still like to hear from you. Please submit your comments on the potential environmental effects of the projects, any proposed measures to prevent or mitigate those effects or any other feedback you would like to provide on the Outlet Channels project.

Email: OutletChannels@gov.mb.ca


This information is available in an alternate format upon request, please contact OutletChannels@gov.mb.ca.


Why This Project Was Started

In 2011, southern Manitoba experienced widespread flooding and Lake Manitoba experienced high inflows through the Waterhen River, Whitemud River, and the Portage Diversion. This outlet project is intended to improve water regulation and reduce the likelihood of flooding on both Lake Manitoba and Lake St. Martin.

Environmental Assessment

Before construction on the Lake Manitoba and Lake St. Martin outlet channels can begin, an Environmental Assessment (EA) is required by federal and provincial law. An EA is a comprehensive review that looks at input from many different sources to predict how it will affect the environment. These inputs include:

  • Public input from open houses and online consultations
  • Consultations with Indigenous communities and groups
  • Regulatory input from federal and provincial offices
  • Field studies, including heritage and environmental
  • Technical input, including consultants, studies and previous experience

Background Information

Where We’re At Now

The Impact Assessment Agency of Canada (Agency) and Manitoba Conservation and Climate (MCC) now reviews the Environmental Impact Statement (EIS) and all feedback. The Agency will draft an Environmental Assessment report that will be available for public comment. MCC prepares the Environment Act Licence which will be shared internally with other Manitoba government departments for their feedback.

Share Your Views

Manitoba Infrastructure would still like to hear from you. Please submit your comments on the potential environmental effects of the projects, any proposed measures to prevent or mitigate those effects or any other feedback you would like to provide on the Outlet Channels project.

Email: OutletChannels@gov.mb.ca


This information is available in an alternate format upon request, please contact OutletChannels@gov.mb.ca.


  • May 2020

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    08 May, 2020

    July 7, 2020 — Lake Manitoba and Lake St. Martin Outlet Channels Progress Report - July 2020.

    May 26, 2020 — The public commenting period on the Environmental Impact Statement (EIS) for the Outlet Channels Project is closed.

    April 21, 2020 — The closing date for comments on the Environmental Impact Statement has been extended until May 25, 2020.