This Circular provides a basic understanding of the characteristics, location, distribution, and quality of infrastructure resources (natural aggregate, energy, and water) in the Colorado Front Range urban corridor between Denver and Ft. Collins. With this understanding, the reader explores the many factors that affect the current and future availability of those resources, including the socioeconomic aspects of the resources and the complexly interwoven individual and collective interests that policymakers, decisionmakers, and the public must address.