Indrapuri Dam, also known as Indrapuri Barrage, is a major irrigation structure built on the Son River in the Rohtas district of Bihar. It was constructed during the British period and is one of the oldest barrages in India. The dam plays a crucial role in irrigation by diverting river water into an extensive canal network. These canals support agriculture across large parts of Bihar and eastern Uttar Pradesh. Indrapuri Dam has contributed significantly to the region’s agricultural productivity and rural economy. The surrounding area offers scenic views of the river and the canal system. It is also an important example of early hydraulic engineering in India. Indrapuri Dam continues to be a lifeline for farmers in the Son river basin.