Actually it’s just a bit lower than that — 23.3 percent. But it’s also important to note that this doesn’t mean that nearly a quarter of bridges are about to fall over. As PolitiFact has noted, “a ‘structurally deficient’ designation does not imply that a bridge is unsafe, but such bridges typically require significant maintenance and repair to remain in service, and would eventually require major rehabilitation or replacement to address the underlying deficiency.” These often are rural bridges, according to the agency. The Federal Highway Administration lists another 84,525 bridges — or almost 14 percent — as “functionally obsolete.” These are mostly urban spans that the agency says don’t “meet current design standards (for criteria such as lane width), either because the volume of traffic carried by the bridge exceeds the level anticipated when the bridge was constructed and/or the relevant design standards have been revised.” Sources: http://www.politifact.com/virginia/statements/2015/oct/26/donald-trump/trump-says-61-percent-us-bridges-trouble/ and https://www.fhwa.dot.gov/bridge/nbi/no10/defbr15.cfm