<p>The confluence of rivers is a very common phenomenon; a large number of works have been devoted to its study. Quite often, confluent rivers are characterized by significantly different water compositions. If the flow velocity in the confluence zone is sufficiently low, then the formation of stratification of water masses is possible, which significantly affects the nature of the hydrodynamics of the phenomenon under consideration. In this case, as a rule, only one factor determining density stratification is considered. In this work, the influence of two factors: temperature and water salinity on the formation of density stratification of water masses is considered using an example of the confluence of the Sylva and Chusovaya Rivers, which are backed up by the Kama hydroelectric station. The influence of these two factors on the formation of layered structures is shown. Based on a combined set of field observations and computational experiments, the possibility of the formation of three-layer structure is shown where water masses with increased mineralization occupy the central part of the flow in depth. The novelty of the study is associated with a situation in which an equal contribution of two independent factors is realized: temperature and water salinity, which leads to a more complex distribution pattern of the consumer properties of water by depth.</p>