Collapse of U.S. 35 Highway Bridge, Point Pleasant, West Virginia, December 15, 1967 (HAR-71/01)

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.

POINV PLECENT BRIDGE U. S. STOCK RESULTS May 21, 1969

C	Kn	P	S	Si	Cu	Ni	Cr	Mo	V	Total	N
0.57	J.64	0.023	0.029	0.15	0.012	0.010	0.016	0.012	<0.005	0.004	0.004

Composition (C3)

C3 is the C13 head of C11-C13NN (Bar 330)

(Segment S4)