The results of the survey culverts on roads Smolensk region. Revealed changes in the state of roads in areas of the device structures of insufficient taking into account peculiarities of the hydrological regime of small streams, may cause erosion, waterlogging and other negative processes. Are examples of the most common emergency situations on the roads, arising from errors in the design of culverts, poor quality of construction, elimination of late emerging adverse changes in their condition.