TSW Water Soldier Herbicide Control 2020

This project does not require posting on the IAA Registry as it is not a physical activity in relation to a physical work and therefore does not meet the definition of a project pursuant to the IAA. However, in accordance with PCA policy, physical activities of this nature require an Environmental Impact Assessment. With this, this project shall be assessed via a Basic Impact Assessment (BIA).

Parks Canada Agency's (PCA) Environmental Services group within Ontario Waterways is presently facilitating the management of the aquatic invasive species file for Water Soldier (Stratiotes aloides) (WS) on the Trent-Severn Waterway (TSW). This project will support work to control WS through mechanical removal and herbicide control for 2020 - 2023 in the TSW.

Based on 2019 monitoring, the WS infestation on the TSW is estimated to be approximately 90 hectares, with a treatment area of approximately 130 hectares. The most upstream populations occur in the Trent River, between County Road #30 and Healey Falls (Lock 17) in the Municipality of Trent Hills. Additional scattered populations of water soldier also exist below Healey Falls within Crowe Bay, Percy Reach and below Glen Ross.

Water soldier colonies reported during the 2020 summer field investigations on the TSW shall be targeted in the fall months (mid-September to mid-October) of 2020 to 2023 with Reward® aquatic herbicide.

This project shall be assessed with a BIA.


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.


Latest update

18 September 2020 – 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.


Key documents

Key documents
Document Number Document Title File Date
1 New Project Being Assessed by Parks Canada - Public Comments Invited 19 August to 18 September, 2020 - August 19, 2020


Trent-Severn Waterway National Historic Site
P.O. Box 567
Peterborough, Ontario K9J 6Z6
Telephone: 705-750-4900 or 1-888-773-8888
Email: trentsevern@pc.gc.ca

  • Location

    • Trent-Severn Waterway National Historic Site (Ontario)
  • Nature of Activity

    • Other, not otherwise specified
  • Assessment Status

    In progress
  • Start Date

  • Proponent

    Parks Canada
  • Authorities

    • Parks Canada Agency
  • Assessment Type

    Project on federal lands
  • Reference Number


Nearby assessments

...within 200 kilometres
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