and maintained. washington, d.c.'s iconic memorial bridge is literally crumbling and now undergoing emergency repairs. in long beach, california, this is called the "diaper bridge" because of the netting to keep chunks of concrete from falling on to traffic below. the american society of civil engineers gave u.s. infrastructure a d-plus. >> this is key to our quality of life. t's key to our economy. te reporter: secretary of transportation, anthony foxx. why hasn't there been a will to fix things? >> because people like ngoundbreakings. they like openings, but we haven't taken on the aggressive routine work of making sure the system stays as healthy as possible. >> reporter: amtrak estimates it needs an additional $20 billion to restore its existing infrastructure in the northeast ta safely maintain its current service levels. 200 feet under washington, d.c., tye city's troubled metro system is leaking. decades of temporary fixes has left the nation's second-largest