Construction of the Arctic Over-the-Horizon Radar (A-OTHR) Capability at 2225 15/16 Sideroad, Clearview Township, Ontario

The Department of National Defence (DND) is proposing a project. As part of Canada's North American Aerospace Defense Command (NORAD) modernization plan, DND is investing in a new Northern Approaches Surveillance System (NASS) to significantly expand NORAD and the Canadian Armed Forces' (CAF) situational awareness of objects approaching and entering Canadian airspace from the North. NASS will include the Arctic Over-the-Horizon Radar (A-OTHR) system that will provide early warning radar coverage and threat tracking.

The A-OTHR capability will be located in Southern Ontario and will extend NORAD and the CAF's situational awareness into the Canadian North and the North Atlantic.

Development at the site will focus on installation of receiving antennas. Land preparation will include flattening of land and removal of any obstructions that would impede the radar's signal. The receiving site will be installed on that portion of the property previously used for agriculture; there is no intent for development to occur within the boundary of the Minesing Wetlands

While specific infrastructure needs are being finalized, the A-OTHR system will require supporting infrastructure at each site:

  • Fully equipped operational building;
  • Physical security features;
  • Maintenance and storage facility;
  • Access road and parking; and
  • Utilities (power, water, wastewater, stormwater, communications).

Additional information is available on the Department of National Defence website.

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Latest update

April 21, 2026 - The Department of National Defence intends to make a determination regarding whether the carrying out of the project is likely to cause significant adverse environmental effects. To help inform this determination, the Department of National Defence is inviting public comments until May 10, 2026 respecting that determination.

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Key documents

Key documents
Document number Document title File Date
1 Public Comment Period on Intent to Make a Determination - April 21, 2026

Contacts

Irv Marucelj
Department of National Defence
Irv Marucelj, Project Manager, NORAD Modernization Infrastructure Project Delivery
NDHQ - 101 Colonel By Dr
Ottawa, Ontario K1A 0K2
Email: NORAD_CI-IC_NORAD@forces.gc.ca


Disclaimer

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.

  • Location

    • 2225 15/16 Sideroad, Clearview Township, Ontario (Ontario)

  • Nature of Activity

    • Defense and Security

  • Assessment Status

    In progress

  • Start Date

    2026-04-21

  • Proponent

    Department of National Defence

  • Authorities

    • Department of National Defence
    • Environment and Climate Change Canada
    • Fisheries and Oceans Canada

  • Assessment Type

    Project on federal lands

  • Reference Number

    90388

Nearby assessments

...within 200 kilometres
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