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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.
Read from the scan by GLM-OCR; expect the odd misread word.
Typical eyebar chain joint for portions of the eyebar chain where the chain was not framed into truss members. Note hanger strap and strap plates in the center of photograph. The strap plate was connected to the top chord of truss members vertically below the eyebar joint. This plate shows makeup of joint C13 north. Figure 2c - Typical Detail of Eyebar Chain and Hanger Connection.
Document, cited by the archive. The PDF is mirrored here; the original link is above. The text was read from the page images by GLM-OCR; expect the odd misread word. 202 pages are in the text index: search them above, or from the library's search.