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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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## TABLE 6 ## Summary of Mechanical Properties of Eyebar Steel From Point Pleasant Bridge Laboratory/Specimen Source Yield Strength0.2% Offsetksi. Tensile Strengthksi. Elongation,%1" ReductionArea,% Nat'l. Bureau of Standards C0,C9 Outer Layer 86.1 121.3 21 52 Inner Layer 71.2 117.7 22 48 Estimate for Bar* 81.0 120.0 21 50 C3 Outer Layer 85.4 120.9 19 52 Inner Layer 69.2 114.2 21 51 Estimate for Bar* 80.0 119.0 20 51 U.S. Steel Laboratory C9 Outer Layer 86.0 121.7 18 51.8 Inner Layer 69.8 116.2 20 50.6 C0 Outer Layer 85.6 120.2 18 54.3 Inner Layer 71.4 118.6 19 49.7 C3 Outer Layer 84.5 119.1 20 52 Inner Layer 68.0 117.7 21 51
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