Crumbling bridges and leaky levees. Buckling roadways. Unsafe water pipes. Inadequate public transit. The list of U.S. infrastructure failings is both broad and deep. The United States is paying only about half of its necessary infrastructure bill, and the total investment gap has grown from $2.1 trillion over 10 years, to a current figure of nearly $2.59 trillion over 10 years, according to the American Society of Civil Engineers. As a result, local government leaders face staggering infrastructure requirements that local tax revenues cannot fulfill.