The nation's transportation and water infrastructures play a vital role in the economy. Private commercial activities and the daily lives of individuals depend on that physical infrastructure, which is provided by all levels of government in the United States. Concerns about the nations' infrastructure and its ability to support commerce and promote public well-being have prompted calls for greater infrastructure spending. This book analyses recent developments in spending on transportation and water infrastructure, trends in spending for capital and for operations and maintenance by the various levels of government, and the rationale for public spending on infrastructure.