Saint-Pierre & Miquelon is the only French territory located in North America, some 20 km south of the Canadian province of Newfoundland-Labrador. The brook trout is the emblematic species of the archipelago’s fresh waters, both in terms of heritage and sport fishing (nearly 10% of the local population fish for this species). The aim of this project is to characterize the ecological status of three of the main rivers and three of the main ponds where this species is present. We analyzed water quality (pH, dissolved oxygen, temperature), determined depths for the three ponds and characterized the physical state of the rivers, including their banks. These data, which are the first ever obtained for most of the rivers and ponds targeted in the project, will be essential for a better understanding of the evolution of char populations on the archipelago, and for proposing restoration actions where appropriate.