Summary of Bridge Owner Responses to Safety Recommendations H-25-3 and H-25-4

​​​​The table below provides a state-by-state listing of bridge owner responses to safety recommendations: 

• H-25-3: Calculate the American Association of State Highway and Transportation Officials (AASHTO) Method II annual frequency of collapse for the bridge(s) identified in appendix B of this report for which you are responsible and inform the National Transportation Safety Board whether the probability of collapse is above the AASHTO threshold. (Urgent) 
• H-25-4: If the calculations that you performed in response to Safety Recommendation H-25-3 indicate that a bridge has an annual frequency of collapse greater than the American Association of State Highway and Transportation Officials threshold, develop and implement a comprehensive risk reduction plan that includes, at a minimum: 

​​guidance and assistance from the Federal Highway Administration, US Coast Guard, and US Army Corps of Engineers Interdisciplinary Team identified in Safety Recommendations H-25-1 and H-25-2, and short- and long-term strategies to reduce the probability of a potential bridge collapse from a vessel collision. (Urgent) 

Disclaimers: 

This information reflects the status as reported by the bridge owners. NTSB did not conduct or independently verify the calculations. 

For additional details and correspondence history see the NTSB’s Case Analysis and Reporting OnLine (CAROL) database.       

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