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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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From Edge,1n. Run A Run B Run C Run D DFE Rc DFE Rc DFE Rc DFE Rc 0.015 257 24.0 249 23.0 257 24.0 251 23.0 0.065 257 24.0 249 23.0 262 25.0 260 24.5 0.115 260 24.5 265 25.0 269 25.5 280 27.0 0.165 260 24.5 260 24.5 277 27.0 285 23.0 0.215 249 23.0 246 22.0 274 26.5 280 27.0 0.265 249 23.0 246 22.0 262 25.0 280 27.0 0.315 234 20.0 234 20.0 263 25.5 299 30.0 0.365 244 21.5 249 23.0 271 26.5 277 27.0 0.415 254 23.5 249 23.0 254 23.5 271 26.0 0.465 251 23.0 260 24.5 257 24.0 265 25.0 0.515 251 23.0 257 24.0 251 23.0 271 25.0 0.565 249 23.0 249 23.0 246 22.0 268 25.5 0.615 251 23.0 254 23.5 0.665 260 24.5 254 23.5 0.715 254 23.5 257 24.0 0.765 260 24.5 265 25.0 0.815 257 24.0 0.865 254 23.5 0.915 257 24.0 0.965 260 24.5 APPENDIX B Notes: 1) See Sketch C of Laboratory Specimen Plan. 2) See Sketch B of Laboratory Specimen Plan. 3) First reading was 0.01/0.02 inch from edge for various fund (average of 0.015 inch). Subsequent readings were spaced 0.05 inch apart. U. S. STEEL LABORATORY DATA
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