President Donald Trump campaigned on a platform to boost US ­infrastructure investment by up to $1 trillion over 10 years, and reaffirmed this commitment in his inauguration speech, saying "we will build new roads and highways and bridges and airports and tunnels and railways." There's no doubt US infrastructure spending is sorely needed. The American Society of Civil Engineers Report Card for American Infrastructure estimated $3.6 trillion in investment will be needed by 2020 . It gives overall US infrastructure a D-plus, with levees and inland waterways being in the worst shape. The US found just how deficient some levees were when Hurricane Katrina slammed into New Orleans in 2005 and devastated other parts of Louisiana and Mississippi. It ranks as the costliest US natural disaster, with total property damage estimated at $108 billion , according to the National Oceanic Atmospheric Association.