There are 541 bridges across southwest Ohio that are rated functionally obsolete by the government, state records show (See the full list and more details on each bridge here). This is the same federal rating given to the Skagit River bridge in Washington state that collapsed Thursday.
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A structurally deficient bridge, when left open to traffic, typically requires significant maintenance and repair to remain in service and eventual rehabilitation or replacement to address deficiencies. To remain in service, structurally deficient bridges are often posted with weight limits to restrict the gross weight of vehicles using the bridges to less than the maximum weight typically allowed by statute.
A functionally obsolete bridge is one that was built to standards that are not used today. These bridges are not automatically rated as structurally deficient, nor are they inherently unsafe. Functionally obsolete bridges are those that do not have adequate lane widths, shoulder widths, or vertical clearances to serve current traffic demand, or those that may be occasionally flooded.
Ohio bridges by the numbers
27,040: Total bridges
3,723: Functionally obsolete
2,230: Structurally deficient