Dams account for a large part of the investment related to basic infrastructures. Considering the fact that increasing safety factor in the project is proportionally followed by an upward increase in costs, it is very essential to ensure the stability of dams in all stages of designing, implementation and commissioning. In the case study of Sural Dam, the performance of instrumentation used in this dam was investigated. For this, the behavior of the dam was investigated by reviewing the documents and technical reports of dam construction as well as the theoretical behavior from numerical analysis and the actual behavior resulting from reading instrumentation as well as comparing those findings. In order to investigate the distribution conditions of displacement, stress and water pressure in the body of the Sural Dam, such instrumentation including: leakage indicator, electric pressure cell and electrical piezometers was used. To analyze the stress-deformation of the Sural Dam in the final stage of construction and (water) intake, the analysis was done using FLAC 3D software and via solving both deformation and water flow. The behavioral model applied is the full Elastoplast model with the Mohr–Coulomb rupture cap. After completing the analysis of the final stage of construction, the values of displacement, stress and pore water pressure obtained from the analyses were compared with the values recorded from instrumentation of the Sural Dam with the efficiency of numerical modeling in predicting the behavior of the dam being examined.