The paper proposes a two-level approach to the calculation of structures for the tsunami
 effect. The concept of the design tsunami and the maximum design tsunami and their corresponding
 limit states is introduced. The estimated loads on the bridge piers from the design and maximum
 design tsunami are estimated, depending on the territory danger and the bridge responsibility. At the
 same time, bridges, in accordance with the approach adopted in transport construction, are divided
 according to their degree of responsibility into four categories. A formula is obtained to estimate the
 design splash value for the design and maximum design tsunami, depending on the bridge category.
 In addition, graphs are provided showing the frequency of the tsunami and the calculated wave
 height corresponding to this frequency. To estimate the combination coefficient of wind and tsunami
 loads, their equally probable pairs are considered. At the same time, the Weibull distribution is used
 to set the wind load, and for the tsunami load, the distribution given in the Code of Rules for
 Ensuring Tsunami Safety is used. Taking into account such load pairs is relevant for bridges with
 high piers, when the height of the splash does not exceed the pier height and there is a high
 probability of a simultaneous combination of wind and tsunami loads. The paper presents the
 calculations of surges for two types of tsunamis: the design one with a repeatability of once in 50
 years and the maximum design one with a repeatability of once in 500 years for the Kamchatka
 region and the Kuril Islands for bridges of the first and second categories. Studies show that for the
 design tsunami and the maximum design tsunami, the coefficients of combinations with wind load
 differ significantly.