Floods are one of the most common natural disasters and cause a lot of damage to the natural and human environment. Bridges are most frequently demolished construction object on flood events as they are directly confronted by the affect of water and its erosion processes. The demolition of bridges often led to deaths. In the theoretical part of the thesis I described the placement of roads in the area and requirements for the design of bridges where I focused on the foundation of structure, statistical determining of flows and hydraulic requirements of watercourses. Due to large erosion and transport power of torrents I described the differences in bridging them. In the second part I described torrent floods in Železniki and Polhov Gradec and summarized the measures taken to ensure their safety. The conclusion contains the guidelines how to achieve higher security.