Application of RipRap for Shoreline Stabilization - Tower Island, Big Rideau Lake, ON

The owners of Tower Island in Big Rideau Lake propose to apply riprap to protect two existing sections of deteriorated shoreline wall, which surround most of the island. Rocks in the size range of 25-45 cm would be placed on a 2.5 : 1 slope. The proposal is to place riprap in front of the existing vertical walls, which will encroach onto the bed of the Rideau Canal (below the high water mark) up to 115 m2. This total will comprise two different areas of placement:

• 35 linear meters of rip rap (53 m2 of encroachment) in front of the existing concrete wall, at a maximum distance of 1.5 m from base of wall.

• 41 linear meters of rip rap would be placed in front of the existing stone & mortar wall (62 m2 of encroachment), at a maximum distance of 1.5 m from base of wall.

As part of the impact assessment process, potential implications to fish habitat and underwater cultural resources will be ascertained.


Latest update

December 24, 2023 – 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 from November 24 to December 24, 2023 - November 24, 2023


Rideau Canal National Historic Site
34 Beckwith Street South
Smiths Falls, Ontario K7A 2A8
Telephone: 613-283-5170 or 1-888-773-8888
Fax: 613-283-0677

  • Location

    • Rideau Canal National Historic Site of Canada (Ontario)
  • Nature of Activity

    • Maintenance activities (fences, walls)
  • Assessment Status

    In progress
  • Start Date

  • Proponent

    External Proponent
  • 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
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