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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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NOTES 1. All measurements of fracture locations to nearest foot. 2. Samples prefixed with "H" are those selected by R. A. Hechtman and shipped to NBS. Samples prefixed "HH" are those selected by N. A. Hechtman and shipped to BPR. NOTATION FC - Flame Cut CL - Cleavage SH - Shear CS - Cleavage and Shear Positive Match Point BPR Shipped to BPR (1st ship) BPR Shipped to BPR (2nd ship) NBS Shipped to NBS USS Shipped to USS BTL Shipped to BATTELLE MISCELLANEOUS SAMPLES Samples selected and shipped to Fritz Engineering Laboratory by Modjeski & Masters 1. Eyebar 25'-4" ± c.c. pin holes, yellow point number 11 with original 11 1/2" diameter pin assembled in one end. 2. Eyebar 25'-4" ± c.c. pin holes, yellow point number 10, also numbered MM36 3. 2 pins 11 1/2" diameter, 1'-1 1/2" long with 4" ring on each. 4. Pin 11 1/2" diameter, 1'-5 1/2" long with 3" ring 5. Pin 11 1/2" diameter, 1'-5 7/8" long, no ring APPENDIX A DR.1
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