Federal regulation requires the collection of bridge condition data, load capacity data, classification data, identification data, geometric data, design and material data, functional appraisal data, cost data, and navigation data. Future ADT Length of improvement Year of future ADT inspections data. The predominant method of collection is visual.
Nondestructive testing is also extensively used.
Examples of NDT are steel crack detection, bridge deck delamination surveys, ultrasonic crack detection techniques and scour monitoring techniques. Schedule - Most bridges are inspected every 2 years. Certain bridges that are determined by the inspection agency to be more critical due to condition, design type, traffic, load capacity, vulnerability to seismic or flood event are inspected more frequently. States failing to comply are ineligible for these funds. The state DOTs are required to submit their data every year.