The Central Arizona Highlands have been the focus of a wide range of research efforts designed to learn more about the effects of natural and human induced disturbances on the functioning, processes, and components of the region's ecosystems. The watershed research spearheaded by the USDA Forest Service and its cooperators continues to lead to a comprehensive understanding of the region's ecology, and to formulation of management guidelines that meet the increasing needs of people in the region, and throughout the Southwestern United States. This report assembles the pertinent details of all watershed research accomplished by the USDA Forest Service and its cooperators in the region and provides highlights of the results. An extensive literature cited section is included for additional information. Information on the current status of the 5 major research area is also provided.