The document analyzes the geotechnical properties of soils from three locations along the Ogun River in Nigeria as potential materials for earth dam construction. Soil samples were collected and tested for properties like particle size distribution, liquid limit, plastic limit, optimum moisture content, permeability, and shear strength. The results found that the soils required improvement to be suitable for dam construction. Specifically, the soils had permeability that was too high and would allow excessive seepage. While meeting some criteria, no single soil possessed all ideal properties. Improvement methods could make the soils adequate, though further studies are needed to address property deficiencies.