UNM has been conducting field studies at Chaco since 2004 with the goal of improving our understanding of socioeconomic organization and change during the Bonito Phase (ca. AD 850 to 1150). Our initial focus was re-opening trenches originally excavated in the 1920s at Pueblo Bonito in order to obtain new geoarchaeological data on water channels and possible canals. That original research has expanded to include the discovery of cacao associated with special ceramics and the development of a GIS-based hydrological reconstruction. In this presentation we summarize our work and results.