Estimating the suspended sediment transfer rate has always been considered as a complicated work for engineers from the past which they were faced with it in doing any water project. Lack of knowledge about the transfer rate of the suspended sediments and particularly an estimate lower than its actual rate can lead to wrong design and consequently destructive effects after the performance in hydraulic structures. Generally, constructing of hydraulic structures such as dams, bridges, power stations and other water supplies is impossible without studying and predicting suspended sediment load. Many relations have been suggested for estimating the suspended sediment load. In this study, six hydrological methods, including single-linear, mean of categories, continuance of flux, the cumulative mean of categories, seasonal and similar hydraulic period have been used for estimating the suspended sediment load in Chamsiah River situated in Kohgiloyeh and Boyerahmad province. These methods are different in using statistics of flow discharge or kind of sediment rating curve. Results indicate a significant difference among considered methods, and finally the cumulative single-linear had been chosen as the optimum method and the continuance of flux method specified as the unsuitable one.