What causes the most damage to our nation’s bridges?

We surveyed all 50 state Departments of Transportation (DOT) and the District of Columbia’s DOT for the Better Roads Annual Bridge Inventory. In doing so, we took a look at what causes the most damage to bridges. Here’s what the DOTs said:

Key: (A)ge (C)orrosion (T)raffic (O)ther

Delaware                       AC
Maryland                       AC
South Carolina            ACT
North Carolina            ACT
Arizona                          ACT
New Mexico                 AO
Alabama                         AT
North Dakota               AT
Montana                        C
New York                      CA
Rhode Island               CA
Utah                                CA
District Of Columbia CA
Missouri                        CAT
Oklahoma                      CAT
Arkansas                        CAT
Hawaii                           CAT
South Dakota             CATO
Virginia                         COTA
West Virginia             COTA
Nebraska                      CTA
Kentucky                       CTAO
Texas                              CTOA
Minnesota                    O
Colorado                      O
Ohio                                OCAT
Washington                 OCTA
Louisiana                      OTCA
California                     TAC
Florida                           TC
Kansas                           TCO

Source: 2014 Better Roads Bridge Inventory