WASHINGTON — An analysis of more than 600, 000 bridges in the federal goverrnment’s latest National Bridge Inventory showed that 65,605 were classified as structurally deficient and 20,808 as being at risk of developing a fracture in a crucial component.
Of those, 7,795 were both — a combination of red flags that experts say indicate significant disrepair and risk of collapse, the review by the Associated Press found.
A bridge is fracture critical when it doesn’t have redundant protections and is at risk of collapse if a single, vital component fails. A bridge is structurally deficient when it is in need of rehabilitation or replacement because at least one major component of the span has advanced deterioration or other problems that make its condition poor or worse. Full story for BostonGlobe.com subscribers.