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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.
Specimen I - Plane 0.8 in. from south face Distance from hole Vickers hardness number 1.0 mm 0.04 in. 247 251 3 .12 238 236 5 .20 240 238 7 .28 240 236 9 .35 233 235 11 .43 235 233 Specimens II and III-Planes parallel to faces Distance from fracture Vickers hardness numbers II-close to north face III-1/4 in. from north face 1.0mm 0.04in. 232 249 2 .08 230 247 3 .12 232 247 4 .16 230 249 5 .20 233 251 6 .24 235 251 7 .28 236 8 .31 232 9 .35 228 Distance from north face Vickers hardness numbers 0.5mm 0.02in. 209 1 .04 233 2 .08 251 3 .12 251 4 .16 251 5 .20 251
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