Abstract: During the study 129 dolphins were observed at 56 different sites with mean group size of 2.30. Total 199.2 dolphins were estimated from Chashma barrage to Guddu Barrage. 81.19% dolphin population had surfacing-interval 0-120 seconds, 16.83 percent 120-240 seconds. The dolphins were observed with probabilities p=1.0, p=0.26 and p=0.21 respectively. Sighting distance and surfacing-intervals were important parameters in dolphin population estimation. With increase in sighting distance and surfacing-interval, the probability of visibility of dolphins on surface of water decreases and chances of missing dolphins from observations are increased.