Define the In-depth inspections for Bridge?

In-depth inspection is a detailed inspection of one or more members below the water level to detect any deficiencies not readily apparent using routine inspection procedures. The marine growth, if any, needs to be cleaned for surface inspection and such cleaning is generally restricted to sample areas of the entire structure.

One or more of the following conditions may dictate the need for an in-depth inspection.

- Inconclusive results from a routine inspection

- Critical structures whose loss would have significant impact on life or property

- Unique structures whose structural performance is uncertain

- Prior evidence of distress

- Adverse environmental conditions such as brackish and polluted water.