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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.
## APPENDIX B ## NATIONAL BUREAU OF STANDARDS TEST RESULTS ## Table A4. Hardness Test Results, Eye C3, Segment 1 Distance from south face Vickers hardness number Spec.1 Spec.3 Spec.5 Spec.7 0.5mm 0.02in. 221 240 245 236 1 .04 236 242 240 243 3 .12 247 254 251 254 5 .20 254 253 258 247 7 .28 254 245 264 245 9 .35 243 243 258 245 11 .43 240 240 254 245 13 .51 243 242 247 225 15 .59 238 233 249 243 17 .67 240 236 247 243 19 .75 236 233 245 242 21 .83 235 236 242 235 23 .91 230 228 240 228 25 .98 228 233 236 236 27 1.06 230 233 236 238 Distance from north face* 16 .63 230 235 247 245 14 .55 235 233 243 242 12 .47 240 236 245 242 10 .39 243 243 251 254 8 .31 243 243 245 249 6 .24 251 249 245 253 4 .16 251 247 245 254 3 .12 247 240 243 2 .08 247 247 249 249 1 .04 251 247 * See text
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