The dam was made to store water of Nalkari River; this is the main attraction of Patratu. One can see flying fishes during sunrise by sitting at the coast of the Dam. Very few people know there is a tunnel below the dam which connects two villages of Patratu named Labga and Hariharpur. Due to security reasons it has been closed for everyone.
Boating has been started from 14 January 2010 on dam. Patratu dam is located 30 km from Ramgarh and 35 km from Ranchi, the road to patratu dam via pithoria is picturesque.
It supplies water to Ramgarh cantonment area and act as the main reservoir of Patratu Thermal Power Plant (PTPS).
