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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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APPENDIX B U. S. STEEL LABORATORY DATA Pt. Pleasant Bridge U. S. Steel Results August 8, 1969 # SUMMARY OF TENSION AND COMPRESSION YIELD STRENGTHS* (Bars 330 and 33) Longitudinal Bar No. Longitudinal Trans. .252" 0.505" Diameter As-Received Stress-Relieved As Rec'd. Tens. Tens. Comp. Tens. Comp. Tens. Tens. 0.2% Offset Yield Strength, ksi 330 77.0 81.0 84.7 81.0 85.2 82.0 33 78.0 78.6 85.5 80.9 85.5 83.0 Static Yield Strength, ksi 330 75.1 78.8 82.9 79.2 82.0 80.0 33 76.2 76.7 84.4 78.8 83.3 81.3 *Refer to "Tension and Compression Tests in Eyebar Shanks (Bars 330 and 33)," U. S. Steel Results, July 28, 1969
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