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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.
Tension and Compression Tests in Eyebar-Shanks Bar No. Spec. Diam. in. Test Dir. Spec No.* (Pars 330 and 33) Tension UYP LYP 0.2% Offset Static Tens. Str., k&i; Elong, % 1" 2" Red. of Area, % Compression Spec No. Yield UYP LYP 0.2% Offset Static As-Received 330 0.252 L 11 79.5 74.6 75.0 74.1 119.3 22.5 57.0 " " " 12 79.1 78.7 78.9 76.1 121.3 22.5 57.5 33 " " 11 77.5 75.5 118.9 22.5 58.0 " " " 12 78.9 78.5 78.5 76.9 120.3 22.5 59.9 330 0.505 L 3 80.7 80.6 80.6 78.3 7 85.4 83.2 " " " 4 81.8 81.1 81.4 79.3 8 84.0 82.5 " " T 9 83.0 81.1 " " " 10 81.0 78.8 33 " L 3 76.3 74.8 7 83.9 82.6 " " " 4 80.9 78.6 8 87.1 86.2 " " T 9 82.7 80.7 " " " 10 83.3 81.8 Stress-Reliued 330 0.505 L 1 82.0 79.8 120.7 19.5 55.2 5 83.9 83.0 83.0 80.6 " " " 2 80.6 78.6 119.3 20.5 54.2 6 83.4 82.4 87.4 83.4 33 " " 1 79.7 78.1 118.5 20.0 57.0 5 87.9 85.0 85.1 82.9 " " " 2 82.0 79.5 119.9 20.0 56.0 6 87.1 85.9 85.9 83.5 Point Pleasant Bridge U. S. Steel Result July 28, 1969
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