Condition ratings based on field inspections are snapshots in time and cannot be used to predict future conditions or behavior of the structure. However, condition ratings based on inspections along with written comments by a field inspector act as the major source of information on the status of a bridge. Condition ratings also help with planning for necessary repairs or modifications. In addition, the condition ratings are used as flags when performing over-weight permit evaluations.

Condition ratings are one-digit numbers given by the field inspector to the various components of a bridge. They are objective and not opinions.

Condition ratings reflect deterioration or damage and do not measure design deficiency. For instance, an old bridge designed to a low load capacity but with little or no deterioration may have excellent condition ratings while a newer bridge designed to modern loads but with deterioration will have lower condition ratings.

Refer to the Coding Guide and the SNBI for details on different components and corresponding coding descriptions. To support the transition to SNBI and the new coding items the number of components that receive condition ratings has increased.