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This is the final highway accident report (NTSB-HAR-71-1) from the National Transportation Safety Board, adopted in December 1970. It covers the collapse of the U.S. 35 bridge between Point Pleasant, West Virginia, and Kanauga, Ohio, on December 15, 1967, which killed 46 people. The Board found that the cause was a cleavage fracture in eyebar 330 at joint C13N. That fracture grew from a flaw produced over 40 years by stress corrosion and corrosion fatigue, in a spot that could not be seen or found by inspection.
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1. Deformation of the structure just prior to collapse 100 2. Hypothesized sequence of collapse 101 3. Comparison with witness testimony 110 E. Status of Bridge Design Practice in 1926 114 1. Factors of safety 114 2. Special considerations for long span bridges 117 3. Treatment of stress concentration problems 119 V. CONCLUSIONS 121 A. With Respect to Sequence of Events in the Collapse of the Point Pleasant Bridge 121 B. With Respect to the Elements which Contributed to the Failure 122 C. With Respect to the Implications for the Safety of Other Bridges 123 D. With Respect to Bridge Inspection and Maintenance 124 VI. CAUSE 126 VII. RECOMMENDATIONS 127 VIII. REFERENCES 129 IX. TABLES 1-7, INCLUSIVE 133 X. APPENDICES After 142 Appendix A. Excerpts from report of E. G. Wiles on reassembly site work, specimen identification, and fracture catalog A1-17 Appendix B. Laboratory data on properties of eyebar steel and A7-2, steel from Point Pleasant Bridge B1-34
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