In the realm of dam-site slope stability assessments, an integrated approach utilizing both kinematic and block theory offers robust and comprehensive insights. While each theory possesses its own strengths and limitations, their combined application yields a more holistic understanding of potential failure mechanisms and enhances risk mitigation strategies. Kinematics analysis evaluates the potential movement of individual rock blocks within the rockmass, based on the orientation and properties of discontinuities whereas Block theory analyzes their stability under various loading conditions, like the weight of the dam and water pressure. This is the primary concern, ensuring the dam's slope which can withstand without failure or excessive deformations that could compromise its integrity. This study is concentrated on dolomitic rock type and hence considers the possible kartification dissolution, weathering and variable mechanical properties in such rock type. The geological model was prepared from geological study and six scan lines were drawn on each bank of Dam-site of Upper Tanahu Storage Hydroelectric Project. It was later verified with finite element analysis method. It was concluded that the maximum safe slope for dam-site slope is 50 degrees. There was slope deformation on the right bank of the Dam-site. Hence, slope excavation should be conducted after considering safe slope for gaining required slope stability of Headworks area.