The Subarnarekha Multipurpose Project has been mainly constructed for irrigation in the states of Jharkhand, West Bengal, and Odisha. Main dam is constructed in Chandil near Jamshedpur (Jharkhand) on river Subarnarekha which has a Left Main Canal passing through hilly terrain. At chainage of 26.15 km, a canal of length 400 m is passing 25 m below the surrounding ground to maintain the canal’s level. To address these concerns, a covered conduit canal was constructed. A layer of 5 m of soil was filled over the RCC conduit. Department of Forest and Environment enforced the construction of one elephant pass over this stretch to enable forest animals to pass from one side of the hill to the other side. This paper presents a case study of geotechnical investigations (Standard penetration test, plate load test, soil index properties, etc.) conducted for constructing an elephant pass monitored by the Central Water Commission (CWC), New Delhi. Elephant pass is a gravity-curved structure constructed to safeguard the previously constructed covered canal conduit and 15 m thick soil was filled up over the gravity-curved structure to maintain the level on both sides of the covered canal. The results of the lab and field tests were employed in the analysis and design of the structure to ensure the safety and stability of the elephant pass. The study underscores the importance of geotechnical investigations in designing structures of infrastructure projects for sustainable development, particularly in regions with challenging terrain and diverse wildlife.