Management of Zebra Mussels in Clear Lake in Riding Mountain National Park

Riding Mountain National Park is proposing management actions to respond to the detection of Zebra Mussels (Dreissena polymorpha) in Clear Lake, located within the park boundaries. The management actions that may be implemented include the use of potash molluscicide and physical methods (e.g., benthic mats, manual removal, etc.). Zebra Mussels can impact native species, severely affect and/or alter food webs and ecosystems, damage infrastructure, and affect visitor experience. The proposal will be assessed using Parks Canada's Detailed Impact Assessment pathway.

Scope: The Detailed Impact Assessment will assess the impacts of management actions in response to the detection of Zebra Mussels on the Park's ecological integrity, cultural resources, species at risk, and visitor experience values. The valued components to be assessed include: values of importance to Indigenous communities as identified through consultation and engagement efforts, cultural resources, water quality, fish and fish habitat, non-target native freshwater mussels and aquatic invertebrates, terrestrial and aquatic bird species, vegetation, and visitor experience.

Latest update

March 29, 2024 – The public comment period on the project is closed. Parks Canada is considering comments received to help inform its determination on whether the carrying out of the project is likely to cause significant adverse environmental effects.



Riding Mountain National Park
135 Wasagaming Drive
Box 299
Onanole, Manitoba R0J 1N0
Telephone: 204-848-7275
Fax: 204-848-2596

  • Location

    • Riding Mountain National Park of Canada (Manitoba)
  • Nature of Activity

    • Remediation and conservation
  • Assessment Status

    In progress
  • Start Date

  • Proponent

    Parks Canada
  • Authorities

    • Parks Canada Agency
  • Assessment Type

    Project on federal lands
  • 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
Date modified: