A recent Portland Cement Association (PCA) report analyzed the National Inventory Data and concluded that for all classes of road or highway systems, reinforced and prestressed concrete bridges have a lower rate of structural deficiency than steel bridges. U.S. reports have found 72,749 of the nation's bridges are structurally deficient; more than half of these constructed from steel.

The data looks at the four major bridge construction materials—reinforced concrete, prestressed concrete, structural steel, and timber—and concluded that 54.3% of deficient bridges were made with structural steel. Reinforced concrete make up 23.8% and prestressed concrete 6.7%. The report also found that concrete bridges are increasing in market share among the four bridge materials. To read the entire report, check out www.cement.org/bookstore.