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Bridges made of uncoated weathering steel plate could be at risk for accelerated deterioration and potential collapse unless federal and state transportation authorities take immediate action to resolve outstanding maintenance issues, says a May 18 recommendation by the National Transportation Safety Board.
The agency action comes as it continues an investigation into the Jan. 28, 2022, collapse of the Fern Hollow Bridge in Pittsburgh, Pa. The 447-foot-long, three-span steel K-frame structure experienced a structural failure and fell approximately 100 ft into an underlying park ravine. Six vehicles were on or near the bridge when it collapsed, leaving four people injured.