This report provides a comprehensive analysis of steel corrosion in New Jersey, combining a review of corrosion processes and protective strategies with empirical data from bridge inspections. Statistical analysis of paint condition data is presented to evaluate the performance of various protective systems, while a survey of uncoated weathering-steel bridges offers insight into their long-term durability.

The findings highlight that deterioration rates are strongly dependent on exposure category, with three-coat zinc-rich systems outperforming alternatives, though beam ends, fascia beams, and bearings remain especially vulnerable. Weathering steel generally performs well but exhibits inferior performance in coastal environments and at overpasses subjected to heavy de-icing agent applications.

Based on these findings, the report recommends targeted maintenance strategies, including routine bridge washing and timing of spot- and over-coating based on exposure categories. It further emphasizes the importance of improved detailing to reduce moisture entrapment and refinement of inspection protocols such as adhesion testing for patina evaluation. Policy-focused recommendations include refining Qualified Products Lists (QPL) to better accommodate new coating technologies and developing predictive models based on inspection data to plan maintenance more effectively.