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From 2014 to 2021, four generating stations were commissioned on La Romaine River, on North shore of St Lawrence River. A specific monitoring program was carried out in summers 2013, 2015, 2017, 2019 and 2021 to follow-up change in eelgrass beds. It involved documenting the eelgrass bed surface area as well as abundance of the eelgrass beds. High resolution satellite images were taken at low tide to characterize bed surface and abundance. Ground truthing was performed to validate the presence or absence of eelgrass plants and to calibrate satellite images. Our results indicate that there are modifications of both surface area and abundance, with years showing increase of surface area and some years indicating a decrease in surface area, especially in the margins of eelgrass beds which are more exposed to waves, tides and currents. Moreover, the results suggest that eelgrass beds persist, and their central part expand. Similar changes over time are also observed in reference sites indicating that these changes are more related to natural variability than the effect of the flooding and operating of Romaine complex.