The focus of this paper is on Ecosystem Restoration Projects undertaken in Arizona by the United States Army Corps of Engineers (Corps), under their Civil Works Mission, in conjunction with local governments in the state. It reports on projects in Pima and Maricopa Counties, the two most populated counties in Arizona. By highlighting the purposes and components of the projects, a greater understanding of the development and implementation of such projects, as well as their costs and benefits, will be gained. In addition, a subsequent grant from the U. S. Bureau of Reclamation is supporting an expansion of this examination of ecosystem restoration. The paper briefly addresses the approach to expanding the study of ecosystem restoration and environmental enhancement projects in Arizona.