WASHINGTON - More than 70,000 bridges across the country are rated structurally deficient like the span that collapsed in Minneapolis, and engineers estimate repairing them all would take at least a generation and cost more than $188 billion.
That works out to at least $9.4 billion a year over 20 years, according to the American Society of Civil Engineers. The bridges carry an average of more than 300 million vehicles a day.
It is unclear how many of the spans pose actual safety risks. Federal officials alerted the states late Thursday to immediately inspect all bridges similar to the Mississippi River span that collapsed.
In a separate cost estimate, the Federal Highway Administration has said addressing the backlog of needed bridge repairs would take at least $55 billion. That was five years ago, with expectations of more deficiencies to come.
http://news.yahoo.com/s/ap/20070803/ap_on_re_us/bridge_safety