Status
of the Nation's Highways, Bridges, and Transit:
2002 Conditions and Performance Report
Exhibit 23-9:
Age Composition of Urban Interstate Bridges
Exhibit 23-9 is a pie chart that shows the age composition of urban interstate bridges. 48.2 percent were built between 1961 and 1970, 30.6 between 1971 and 2000, 17.8 between 1951 and 1960, and 3.3 before 1950.
Source: National Bridge Inventory.
