CBO - Issues and Options in Infrastructure Investment
Issues and Options in Infrastructure Investment, May 2008: pdf | data
"The condition and adequacy of the nation’s physical infrastructure—including its surface, air, and water transportation networks; its energy, water, and telecommunications utilities; and its dams and schools—are important for the vitality of the economy and for
public health and safety. Yet calls for increased federal investment in infrastructure must be carefully analyzed and weighed against other spending priorities."