Inventory database was used, and the models have the NBI condition ratings as their response variables. The model families were categorized by administrative region, functional class, and superstructure material type. The explanatory variables include traffi c volume and truck traffi c, climatic condition, and design type and features. FindingsThis study used the NBI database to develop families of deterioration curves for the bridge deck, superstructure, and substructure components. The study confi rmed that environmental variables play a signifi cant role in bridge deterioration. For several of the deterioration models, the climate variables of freeze index, number of freezethaw cycles, and average precipitation were found to be signifi cant predictors of bridge component deterioration.Compared to the superstructure and substructure, deck deterioration was found to be more aff ected by traffi c loading. It was also observed that bridge components that had undergone some repair since their construction exhibited patterns of deterioration that were diff erent when compared to those that had not received any such JOINT TRANSPORTATION RESEARCH PROGRAM

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