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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.
“R.G.”1 page
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## TABLE 5 Summary of Chemical Analysis of Eyebar Steel From Point Pleasant Bridge Laboratory Sample Identification C Mn S P Si Cu, Ni, Cr, V, Mo National Bureau of Standards C9 head of C9-C11NN-C9 0.62 0.63 0.03 0.024 0.16 0.05 C11 head of C11-C13NN-C0 0.61 0.66 0.03 0.028 0.14 0.05 C13 head of C11-C13NN-C3* 0.58 0.64 0.03 0.025 0.13 0.05 C13 head of C11-C13NS-C4 0.60 0.65 0.05 0.028 0.14 0.05 Av. 0.60 0.65 0.03 0.026 0.14 U. S. Steel C9 head of C9-C11NN-C9 0.62 0.72 0.03 0.022 0.19 0.04 C11 head of C11-C13NN-C0 0.61 0.66 0.035 0.023 0.15 (V not checked) C13 head of C11-C13NN-C3* 0.57 0.64 0.029 0.023 0.15 0.02? Av. 0.60 0.67 0.03 0.023 0.16 American Bridge Company, (Six Sample Bars, 1927) Av. 0.59 0.66 0.030 0.041 0.145 Min. 0.55 0.64 0.021 0.036 0.112
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