The efforts to deal with the disturbances related to the performance of urban traffic are made by providing alternative roads, such as underpasses and overpasses at road traffic density points. This study examines the underpass project in Surakarta, a critical congestion point due to a railway track crossing. The project involves excavating the ground to a depth of 11.5 m below the surface, requiring meticulous planning to ensure safety and stability, considering soil characteristics and groundwater level. This study used PLAXIS 2D software to determine the excavation process's safety factor and evaluated the impact of excavation on the groundwater drawdown. The integrated output of both analyses provides a comprehensive understanding of the interaction between slope stability and the changes in the groundwater table in the underpass project. The findings indicated that the underpass construction significantly affects the groundwater table up to a radius of 250 m from the project site. The slope stability analysis highlights the need for careful execution to prevent slope failure during the underpass construction.