Reservoir management involves allocating available water among multiple uses and users, minimizing the risks of water shortages and flooding, and optimizing the beneficial use of water. However, a number of climate change predictions project rise in temperature and change in precipitation characteristics which may change the inflow pattern to a reservoir and eventually affect its performance in the long run. In the present paper, reservoir operation analysis has been carried out and impact of changing climate on the performance analysis of Pandoh reservoir has been evaluated. Pandoh reservoir diverts water from the Beas river in the Beas-Sutlej link for production of hydropower at Dehar Power Plant before it joins the Sutlej river.