The development of the mineral resource base of the Arctic region of the Russian Federation has become possible, among other things, due to the increase in the duration of the navigation period and the improvement of navigation conditions due to climatic changes. The development of oil and gas reserves in this region creates the need to provide marine transport infrastructure, and, consequently, the development of existing and construction of new port hydraulic structures. The author of the article reviewed the data of satellite observations of the sea level anomaly in the area of the construction of the Indiga port in the southeastern part of the Barents Sea from October 1992 to September 2022. It is shown that there is a stable positive trend towards sea level increasing over a period of 30 years, which indicates that a number of data series used in constructing probability curves according to regulatory methods are nonstationary. The lack of consideration of climatic changes in the level regime leads to incorrect results of calculations of water levels of a given probability according to current regulatory methods, therefore, the article deals with an example of considering the data of climatic modeling of the level regime of the Indiga port area for the life cycle of port hydraulic structures. Dividing the service life of the structure into stages, which consider the change in the marks of the structure or its absence, depending on the actually observed increase in the level of the water area, will ensure the reliability and safety of operation throughout the life cycle. The reserves laid down during the design and the creation of long-term reconstruction plans will make it possible to carry out work on raising the berth marks for berthing structures and the marks of the upper structure of protecting structures with the least expenditure of material resources and time.
