Explain the Routine inspections - inspection of bridge?

These determine the physical and functional condition of the structure, identifying changes from the inventory, baseline, or previously recorded conditions. Routine inspections should be performed on a cyclical basis and are a proactive approach to maintenance. Routine Inspection of substructures in water must be conducted at least every five years. Structures having underwater members which are partially deteriorated or which are in unstable channels may require shorter inspection intervals.