The lake water quality class was used as the basis that Chemical Oxygen Demand(COD) in Korea. Also, it was not the item that represents the density of the algae(Chl-a) does not contain a proper assessment of the eutrophication. The Geumgang river evaluate the achievement of water quality goal and trophic state was evaluated at four trophic levels using the Korean Trophic State Index(TSIko). For the evaluate achievement of water quality goal, we used water quality dataset of 2000 to 2009 in Geumgang river area which was obtained form the Ministry of Environment. As a result, achievement ratio was approximately 59.1%. Since 2007, the eutrophication degree assessment of Daecheong lake TSIko was increasing until the present. Especially, TSIko value was the highest in 2011. In conclusion, water quality assessment for Chungnam River Area(6basin)using the TSIko was that eutrophication of rivers is a serious. It is expected that the trophic state index resulted from this study can contribute toward long-term water quality improvement plans for Geumgang river area.