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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.
NATIONAL BUREAU OF STANDARDS TEST RESULTS Table A2. Hardness Tests Results, Eye C9, Segment 1. Distance from south face* Vickers hardness number Spec.A Spec.D Spec.F Spec.H 0.5mm 0.02in. 260 243 256 230 1.0 .04 256 247 262 243 1.5 .06 256 249 268 242 2.5 .14 254 262 260 264 4.5 .18 264 245 262 259 8.5 .33 247 251 251 12.5 .49 242 242 247 15.5 .61 233 240 22.5 .89 232 235 * See text Distance from north face Vickers hardness number Spec. C Spec. E Spec. G Spec. J 0.5mm 0.02in. 247 235 236 216 1.0 .04 245 242 247 240 1.5 .06 254 253 251 245 2.5 .10 260 264 254 247 3.5 .14 270 266 258 254 4.5 .18 266 266 266 260 8.5 .33 260 260 258 254 12.5 .49 247 251 249 254 15.5 .61 242 243 247 256 22.5 .89 236 242
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