There is limited research of InSAR applications in very dynamic wetlands in the Great Lakes or for other Canadian wetlands. In this study, we investigated the potential of using C-band SAR data for monitoring marsh wetlands flow dynamics in the Great Lakes. Results from InSAR observations in Long Point, Ontario, Canada indicate that consistent coherence from Radarsat-2 and Sentinel-1 data was observed in cattail and phragmites dominated areas, which enabled the generation of reliable measurements for monitoring water level changes.