This dataset includes measurements collected from the Tvärminne coastal area in 2014 and 2015. Each record contains sampling metadata (ID, replicate number, month, year, and depth), along with water column parameters such as temperature (°C), salinity, water density (kg/m³), and kinematic viscosity (m²/s). Sediment characteristics are represented by the median grain size (d50), and critical shear stress values (N/m²) have been determined using the EROMES erosion measurement system.