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DOI : 10.17693/yunusae.v17i26557.283664 Viewed : 3243 - Downloaded : 1936 This study was carried out to determine trophic status of Uzunçayır Dam Lake. For this aim, secchi disk depth, chlorophyll a, total phosphorus and nitrogen values of three stations on the dam lake were measured at monthly between May 2013-April 2014. Uzunçayır Dam lake, secchi depth 1.48-11.04 m, chlorophyll a from 0-34.3 µg L^-1, phosphorus from 0.06-1.12 µg L^-1 and nitrogen from 0-3.82 µg L^-1. It was found that secchi disk was negatively correlated to chlorophyll a. According to TN: TP rate, it was determined that phytoplankton development to be limited by nitrogen. According to the mean value of Carlon`s TSI, the dam lake was oligotrophic. Keywords : Nitrogen,Phosphor,Chlorophyll a,Secchi Disc,Trophic Index,Uzunçayır Dam Lake