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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 Testo (C3) Segment S1L), Specimen 2,4,6,8 POINT LOUISVILLE BRIDGE U. S. STOCK ROMULUS May 21, 1969 Location Hardness 0.025 0.050 0.075 0.100 0.125 0.150 0.175 0.200 0.225 0.250 0.275 Run A DPH 251 254 254 251 251 260 251 265 262 262 254 Rc3) 23 23 23 23 23 25.5 23 25 25 25 23 Run B DPH 249 251 257 251 265 260 260 277 262 262 262 Rc3) 23 23 24 23 25 24.5 24.5 27 25 25 25 NOTES: 1) See Sketch A of Laboratory Specimen Plan 2) See Sketch B of Laboratory Specimen Plan 3) Converted from DPH using Wilson Conversion Chart
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