In this study. an analysis was performed on changes in erodibility indices and some other properties of soils in Erfelek Dam watershed constructed in Sinop-Turkey with a view to generate drinking, domestic and irrigation water according to land use regimes (open space, cultivated area and forested area) and the parent material (limestone and mudstone) from which soil develops. 53 sample plots were selected from frontier lands with the same aspect (northern aspect) in the same altitude zone and approximately in the same slope class. Soil samples were gathered according to depth levels (0-20 and 20-50 cm) from cross sections of soils pertaining to selected lands. In soil samples, analyses such as particle size distribution, soil organic matter (SOM), dispersion ratio (DR), erosion ratio (ER), colloid-moisture equivalent ratio (C-MER), structural stability index (SSI), available water capacity (AWC), soil reaction (pH) and total lime (CaCO(3)) were performed. A variance analysis was performed in order to test whether the obtained results vary according, to land use regime and parent material. The results show that average erodibility indices (ER and DR (p < 0.01): C-MER and SSI p < 0.05) and soil properties such as clay (p < 0.01), SOM and CaCO(3) (p < 0.05), and pH (p < 0.001) vary according to land use regime. Besides average erodibility indices (ER, DR and SSI (p < 0.01), C-MER (p < 0.05)) and soil properties such as clay, AWC, pH and CaCO(3) (p < 0.05) vary according to parent material. Consequently, it was concluded that, soils that were developed from different parent materials and are under three different land use regimes were liable to erosion. However, soils that were developed from mudstone parent material and are being used as forested area were found to be more susceptible to erosion. The study area of Erfelek Dam Creek Watershed renders these results fairly significantly. The results suggest that considering these results in works related with planning, management and improvement of the basin will surely contribute to the economic life of the dam.