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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.
Segment 801) Specimens 1-8 Point Pleasant Bridge U. S. Steel Results February 14, 1969 Revised: Feb. 26, 1969 U. S. STEEL LABORATORY DATA Specimen2) Hardness Near One Surface Hardness at Center Hardness Near Other Surface 1 22.5,22.5,21 22,21,21.5 23,23,22.5 3 22,22.5,21.5 20.5,20.5,20 22.5,22,22.5 4 21,22,21.5 20,20.5,20.5 22,22.5,23 5 21.5,21,21 20.5,20,20.5 22,22,22 7 21,21,21 20,20,21 21.5,22.5,23 8 20,21,20.5 21,21.5,22 22.5,23.5,21.5 Rockwell C Hardness Across Cross-Section Specimen 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Run A 22.0 23.5 23.0 22.0 21.5 21.0 20.5 21.0 22.0 23.0 23.5 23.5 24.0 22.0 Run A 22.0 23.0 22.0 22.0 21.5 20.5 20.5 20.5 21.0 21.5 22.0 22.5 22.5 23.5 23 APPENDIX B Specimen Hardness .025 .050 .075 .100 .125 .150 .175 .200 .225 .250 .275 .300 Run B DPH Rc3) 262 25 260 24.5 262 25 268 25.5 283 28 283 28 280 27 249 23 286 28 296 29 289 28.5 286 28 Run C DPH Rc3) 254 23.5 274 26.5 260 24.5 277 27 271 26 293 29 293 29 277 27 286 28 286 28 Run E DPH Rc3) 257 24 246 22 246 22 262 25 277 27 260 24.5 257 24 280 27 277 27 265 25 280 27 274 26.5 Run C DPH Rc3) 251 23 260 24.5 274 26.5 280 27 283 28 262 25 265 25 268 25.5 283 28 268 25.5 - B27 - otes: 1). See Sketch C of Laboratory Specimen Plan. 2) See Sketch B of Laboratory Specimen Plan. 3) Converted from DPH using Wilson Conversion Chart.
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