Physico-chemical status of Kamla dhar of Katihar (Kosi zone) were investigated during March 2015 to April 2016. The result revealed well defined seasonal variation. Relatively high temperature, high value of dissolved oxygen and highest production range of alkalinity were observed which are favorable factors for the production of air breathing fishes. On the basis of present study, parameters the river water appears to be of moderate trophic level. On the whole river is getting pollute due to intense human activities and influence infusion of foreign materials from the surroundings. These materials mainly comprise of decomposable organic matters of plants and animals, terrestrial washing and effluents.