The doctoral dissertation presents the results of own research into the durability of reinforced concrete bridges in warm climates. An assessment of the condition of seven reinforced concrete bridges in Libya, the calculation of their rating and their ranking from the aspect of type and degree of damage, in accordance with the German BMS methodology, was done. A catalog of characteristic defects and damage was created and the basic causes of their occurrence were defined. The set goals were met, and the analysis of the research results showed that the specificities of warm climates must be taken into account when assessing the condition, determining the rating of bridges and proposing a strategy for their maintenance.