Assessment of fly ash pond dyke stability is crucially important in preventing structural failures and their consequent repercussions on the environment. To achieve reliable and resilient design, it is essential to determine strength parameters that accurately represent the range of conditions that the dykes encounter in the field. This study analyzes the stability of dykes made of fly ash using Slope/W module in GeoStudio. The input parameter such as internal friction angle required for the analysis purpose is measured by conducting a series of direct shear tests on ash compacted to different densities. The measured friction angles range from 28° to 36°, mimicking the influence of compaction and moisture on fly ash behavior. By inputting the measured friction angles, stability analysis to determine the factor of safety (FoS) is carried out. It is noticed from the results a significant variation in the values of FOS with change in density. A maximum FOS of 1.524, indicating a stable condition, is declined with variable density values, indicating possible risks to dykes with change in compaction properties of fly ash. The study underscores the critical role of shear strength parameters in influencing dyke stability, providing a robust framework for evaluating and enhancing the structural performance of ash dykes.