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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 NATIONAL BUREAU OF STANDARDS TEST RESULTS ## Table A1. Hardness Test Results Eye CO, Segment 1. Distance from south face Vickers hardness number Spec.A Spec.D Spec.F Spec.H 0.5mm 0.02in. 245 238 233 210 1.0 .04 251 245 243 240 1.5 .06 253 245 251 243 2.5 .10 262 253 254 249 3.5 .14 264 251 251 249 4.5 .18 260 253 253 256 8.5 .33 258 256 254 258 12.5 .49 258 254 247 254 15.5 .61 251 253 249 253 22.5 .89 242 Dista.e from north face Vickers hardness number Spec. C Spec. E Spec. G Spec. J 0.5mm 0.02in. 232 216 212 213 1.0 .04 242 227 230 227 1.5 .06 243 233 235 235 2.5 .10 245 238 243 243 3.5 .14 251 242 245 242 4.5 .18 254 254 242 253 8.5 .33 258 254 253 254 12.5 .49 253 256 249 254 15.5 .61 249 249 251 253 22.5 .89 236 254
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