The Fern Hollow Bridge collapse in Pittsburgh resulted from corrosion-induced tie plate failure, insufficient inspections, and inadequate maintenance.

Final NTSB report on the Fern Hollow Bridge collapse in Pittsburgh reveals poor-quality inspections, insufficient oversight, and the city's failure to act on maintenance recommendations led to the bridge's failure. The collapse was caused by a tie plate's failure due to corrosion, exacerbated by clogged drains and incorrect load calculations. The NTSB issued new safety recommendations to the city.

March 22, 2024
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