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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.
Hardness Tests (CO) Segment S01) Specimen #12) Point Pleasant Bridge U. S. Steel Results (Readings are Vickers hardness (DPH). Approximate Rockwell C conversion hardness values as determined from Wilson Conversion Chart are also shown). Revised: Feb. 26, 1969 From Surface, in. Run A Run B Run C Run D DPH Rc DPH Rc DPH Rc DPH Rc 0.01 277 27.0 268 25.5 262 25.0 244 21.9 0.06 289 28.5 277 27.0 274 26.5 257 24.0 0.11 286 28.0 274 26.5 274 26.5 280 27.0 0.16 280 27.0 274 26.5 283 28.0 286 28.0 0.21 283 28.0 277 27.0 274 26.5 286 28.0 0.26 274 26.5 268 25.5 257 24.0 283 28.0 0.31 280 27.0 283 28.0 289 28.5 268 25.5 0.36 271 26.0 277 27.0 260 24.5 280 27.0 0.41 - - 265 25.5 268 25.5 260 24.5 0.46 280 27.0 280 27.0 274 26.5 271 26.0 0.51 268 25.5 268 25.5 271 26.0 262 25.0 0.56 299 30.0 244 21.5 0.61 271 26.0 257 24.0 0.66 280 27.0 268 25.5 0.71 280 27.0 274 26.5 0.76 260 24.5 271 26.0 0.81 257 24.0 0.86 293 29.0 0.91 274 26.5 - B25 - APPENDIX B U. S. STEEL LABORATORY DATA Notes: 1) See Sketch C of Laboratory Specimen Plan. 2) See Sketch B of Laboratory Specimen Plan.
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