Thunder Bay Area of Concern

Thunder Bay was designated as one of the 43 Areas of Concern in accordance with Great Lakes Water Quality Agreement (GLWQA). Remedial Action Plan (RAP) is an ongoing collaborative effort implemented by federal, provincial, and local governments as well as industry and public partners. There are 3 key stages of the RAP: Stage 1 is a detailed description of the environmental problem; Stage 2 identifies remedial actions and options; Stage 3 is the final document providing evidence that the beneficial uses have been restored and the AOC can be “delisted”.

The Thunder Bay Area of Concern extends approximately 28 km along the shoreline of Lake Superior from north of Bare Point south to Flatland Island and up to 9 km offshore, including the Welcome Islands. The area’s watershed is drained by the Kaministiquia River system and a number of smaller rivers and creeks. The marsh area of the harbour represents a major portion of wetlands in the Lake Superior basin in Canada, providing habitat for nesting and migrating species of birds and a wide variety of fish.

For more information visit: https://www.canada.ca/en/environment-climate-change/services/great-lakes-protection/areas-concern/thunder-bay.html

Data and Resources

Additional Info

Field Value
Last Updated April 17, 2026, 21:57 (UTC)
Created April 17, 2026, 21:57 (UTC)
contact_person {}
criticality_level []
data_dictionary []
geographic_scope ["3558"]
open_canada_collection primary
open_canada_date_published 2018-09-19 00:00:00
open_canada_keywords {"fr": ["Thunder Bay", "Kaministiquia River", "Kaministiquia River Downstream", "Little Gravel River", "plan d'action des Grands Lacs (PAGL)", "secteur préoccupant", "d’assainissement et de remise", "politique binational", "d’assainissement", "de partenariats", "utilisations bénéfiques", "Environnement", "Environnement", "Biologie", "faune et flore", "Thunder Bay"], "en": ["Thunder Bay", "Kaministiquia River", "Kaministiquia River Downstream", "Little Gravel River", "Great Lakes Action Plan (GLAP)", "Area of Concern", "remedial and restoration", "binational policy", "remediation", "partnerships", "beneficial use impairments", "Environment", "Environment", "Biota", "Thunder Bay"]}
open_canada_subject ["nature_and_environment"]
sensitivity_level unrestricted
title_fr Baie Thunder secteur préoccupant
update_frequency as_needed