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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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## LIST OF FIGURES FIGURE NUMBER LEGEND PAGE NUMBER 1 General View of Point Pleasant Bridge 4 2a View of Bridge from Ohio End, with Locations of Typical Details to be shown in Figs. 2b - 2d 5 2b Typical Detail of Truss to Chain Connection 6 2c Typical Detail of Eyebar Chain and Hanger Connection 7 2d Detail of Expansion Joint at Connection of Truss to Chain Bent Post 8 3 Logic Framework for Conduct of Investigation 14 4 Master Chart for Location of Laboratory Specimens 26 5a Group "A" Specimens 27 5b Group "B" Specimens 28 5c Group "C" Specimens 29 5d Group "D" Specimens 30 5e Group "E" Specimens 31 6 Variation of Hardness through Thickness of Eyebar Materials (NBS Photo) 33 7 Small Semi-circular Crack (upper left of photo) which existed prior to Fracture in Eyebar No. 330 (NBS Photo) 33 8 Micro Structure of Eyebar Material (a) Outer Surface (b) Martensite at 0.2" depth (c) Interior 35 9 Location of Burr on Eyebar No. 33 (NBS Photo) 36 10 Detail of Burr on Eyebar No. 33 after Polishing and Etching (NBS Photo) 36
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