Evaluation of the operational reliability of such important structures as the arch-gravity dam of the Sayano-Shushenskaya hydroelectric power station should be based primarily on the research of stress-strain state of buildings and grounds, combining mathematical modeling and statistical processing of field and experimental data. A more accurate account of safety requirements in the construction of the dispatching schedule can be achieved by moving from the set for a certain set of years of a number of restrictions on the levels of filling of the reservoir directly to the indicators of the established dynamic safety criteria. Such an indicator is the size of the radial displacement of the crest of the dam section 33 of the reservoir Sayano-Shushenskaya HPP. It is shown that such a calculation model of radial displacements of the ridge of the Sayano-Shushenskaya HPP dam is necessary, in which only the indicators obtained by water management calculations were used as initial ones. It has been suggested that the size of the dam crest movement over the calculated time interval in different periods of the calendar year may depend both on the static head and on the change in head over the calculated time interval. This assumption was checked on the basis of the analysis of radial displacements of the crest section 33 of the Sayano-Shushensky hydroelectric complex over the years 2001…2016, the model describes the radial displacement of the crest 33 of the section of the dam of Sayano-Shushenskaya HPP, depending on the pressure and change of pressure for the calculated time interval. According to the proposed algorithm, a computer program was developed, and the calculation of the displacement of the crest of the dam Sayano-Shushenskaya HPP for 2001...2016 years (360 intervals). The estimation of accuracy of the received results is given. It is proposed to use the developed model for the construction of dispatching schedules in the development of rules for the use of water resources of the Sayano-Shushensky reservoir on the Yenisei river. The developed model uses only indicators of water management calculations as initial data, which is convenient for operational planning of safe operating modes of Sayano-Shushensky hydroelectric power station.